|
It is still early but here are some of the strongest peaks:
Fe Y Zr
I'll send the .mca later when I have some decent counts.
Charles
|
|
|
I am still running this scan but the element list is now:
Fe Hf Y Zr
I have also included an intermediate .mca file.
BTW my gamma scans show this is a combination of U238 and Th232 decay chains.? I have attached scans of various cyrtolites (including this one) whose Pb212 peaks at 238keV are relatively large, indicating the presence of Th232.? The Pb214 peak at 295keV indicates U238.
Charles
It is still early but here are some of the strongest peaks:
Fe Y Zr
I'll send the .mca later when I have some decent counts.
Charles
|
toggle quoted message
Show quoted text
From: [email protected]
[mailto:[email protected]] On Behalf Of Charles David Young
Sent: Tuesday, January 21, 2020 3:49 PM
To: [email protected]
Subject: Re: [XRF] cyrtolite Little Patsy XRF
?
I am still running this scan but the element list is now:
I have also included an intermediate .mca file.
BTW my gamma scans show this is a combination of U238 and
Th232 decay chains.? I have attached scans of various cyrtolites
(including this one) whose Pb212 peaks at 238keV are relatively large,
indicating the presence of Th232.? The Pb214 peak at 295keV indicates
U238.
?
?
It is still early but here are some of the strongest peaks:
I'll send the .mca later when I have some decent counts.
|
Ok, here are the final files.? I'll start the other South Platte cyrtolite now.
Charles
On Tue, Jan 21, 2020 at 7:17 PM Dude < dfemer@...> wrote:
Lookin’ good
Dud
?
?
I am still running this scan but the element list is now:
I have also included an intermediate .mca file.
BTW my gamma scans show this is a combination of U238 and
Th232 decay chains.? I have attached scans of various cyrtolites
(including this one) whose Pb212 peaks at 238keV are relatively large,
indicating the presence of Th232.? The Pb214 peak at 295keV indicates
U238.
?
?
It is still early but here are some of the strongest peaks:
I'll send the .mca later when I have some decent counts.
|
Charles, you should have it QA'ed by someone else, but wow, that is impressive. Do you have a zirconium standard? I've got a zirconium disc if you need one.
Steve
toggle quoted message
Show quoted text
Ok, here are the final files.? I'll start the other South Platte cyrtolite now.
Charles
On Tue, Jan 21, 2020 at 7:17 PM Dude < dfemer@...> wrote:
Lookin’ good
Dud
?
?
I am still running this scan but the element list is now:
I have also included an intermediate .mca file.
BTW my gamma scans show this is a combination of U238 and Th232 decay chains.? I have attached scans of various cyrtolites (including this one) whose Pb212 peaks at 238keV are relatively large, indicating the presence of Th232.? The Pb214
peak at 295keV indicates U238.
?
?
It is still early but here are some of the strongest peaks:
I'll send the .mca later when I have some decent counts.
|
Thanks, Steve!? Hm, what is impressive? I have some 99% zirconium.? Is that what you mean by a standard?
Charles
On Tue, Jan 21, 2020 at 7:46 PM WILLIAM S Dubyk < sdubyk@...> wrote:
Charles, you should have it QA'ed by someone else, but wow, that is impressive. Do you have a zirconium standard? I've got a zirconium disc if you need one.
Steve
Ok, here are the final files.? I'll start the other South Platte cyrtolite now.
Charles
On Tue, Jan 21, 2020 at 7:17 PM Dude < dfemer@...> wrote:
Lookin’ good
Dud
?
?
I am still running this scan but the element list is now:
I have also included an intermediate .mca file.
BTW my gamma scans show this is a combination of U238 and Th232 decay chains.? I have attached scans of various cyrtolites (including this one) whose Pb212 peaks at 238keV are relatively large, indicating the presence of Th232.? The Pb214
peak at 295keV indicates U238.
?
?
It is still early but here are some of the strongest peaks:
I'll send the .mca later when I have some decent counts.
|
Attached are the scans of both cyrtolites from South Platte.? The latest also has the id of thorite.
So is it fair to say that that Hf, Zr, and Th are common in cyrtolites because of substitution?? Also, is the Y due to the xenotime?
I am now scanning the cyrtolite from Cactus Jack.
Charles
Thanks, Steve!? Hm, what is impressive? I have some 99% zirconium.? Is that what you mean by a standard?
Charles
On Tue, Jan 21, 2020 at 7:46 PM WILLIAM S Dubyk < sdubyk@...> wrote:
Charles, you should have it QA'ed by someone else, but wow, that is impressive. Do you have a zirconium standard? I've got a zirconium disc if you need one.
Steve
Ok, here are the final files.? I'll start the other South Platte cyrtolite now.
Charles
On Tue, Jan 21, 2020 at 7:17 PM Dude < dfemer@...> wrote:
Lookin’ good
Dud
?
?
I am still running this scan but the element list is now:
I have also included an intermediate .mca file.
BTW my gamma scans show this is a combination of U238 and Th232 decay chains.? I have attached scans of various cyrtolites (including this one) whose Pb212 peaks at 238keV are relatively large, indicating the presence of Th232.? The Pb214
peak at 295keV indicates U238.
?
?
It is still early but here are some of the strongest peaks:
I'll send the .mca later when I have some decent counts.
|
Here is the addition of the Burnet County, TX cyrtolite:
Charles
Attached are the scans of both cyrtolites from South Platte.? The latest also has the id of thorite.
So is it fair to say that that Hf, Zr, and Th are common in cyrtolites because of substitution?? Also, is the Y due to the xenotime?
I am now scanning the cyrtolite from Cactus Jack.
Charles
Thanks, Steve!? Hm, what is impressive? I have some 99% zirconium.? Is that what you mean by a standard?
Charles
On Tue, Jan 21, 2020 at 7:46 PM WILLIAM S Dubyk < sdubyk@...> wrote:
Charles, you should have it QA'ed by someone else, but wow, that is impressive. Do you have a zirconium standard? I've got a zirconium disc if you need one.
Steve
Ok, here are the final files.? I'll start the other South Platte cyrtolite now.
Charles
On Tue, Jan 21, 2020 at 7:17 PM Dude < dfemer@...> wrote:
Lookin’ good
Dud
?
?
I am still running this scan but the element list is now:
I have also included an intermediate .mca file.
BTW my gamma scans show this is a combination of U238 and Th232 decay chains.? I have attached scans of various cyrtolites (including this one) whose Pb212 peaks at 238keV are relatively large, indicating the presence of Th232.? The Pb214
peak at 295keV indicates U238.
?
?
It is still early but here are some of the strongest peaks:
I'll send the .mca later when I have some decent counts.
|
This is a cyrtolite from Branchville Quarry, CT.? It has less of Fe, Hf, Th, and Y than the previous cyrtolites.? It has more U.? This is consistent with my gamma spec that I previously attached showing a typical U238 with no significant Th232.
Here is the addition of the Burnet County, TX cyrtolite:
Charles
Attached are the scans of both cyrtolites from South Platte.? The latest also has the id of thorite.
So is it fair to say that that Hf, Zr, and Th are common in cyrtolites because of substitution?? Also, is the Y due to the xenotime?
I am now scanning the cyrtolite from Cactus Jack.
Charles
Thanks, Steve!? Hm, what is impressive? I have some 99% zirconium.? Is that what you mean by a standard?
Charles
On Tue, Jan 21, 2020 at 7:46 PM WILLIAM S Dubyk < sdubyk@...> wrote:
Charles, you should have it QA'ed by someone else, but wow, that is impressive. Do you have a zirconium standard? I've got a zirconium disc if you need one.
Steve
Ok, here are the final files.? I'll start the other South Platte cyrtolite now.
Charles
On Tue, Jan 21, 2020 at 7:17 PM Dude < dfemer@...> wrote:
Lookin’ good
Dud
?
?
I am still running this scan but the element list is now:
I have also included an intermediate .mca file.
BTW my gamma scans show this is a combination of U238 and Th232 decay chains.? I have attached scans of various cyrtolites (including this one) whose Pb212 peaks at 238keV are relatively large, indicating the presence of Th232.? The Pb214
peak at 295keV indicates U238.
?
?
It is still early but here are some of the strongest peaks:
I'll send the .mca later when I have some decent counts.
|
Charles,
Assuming everything was kept constant ?here’s the relative
concentration for each cyrtolite
CpsX1000
Patsy???? Platt?????? Cactus
Zr Kb????? 5.9????????? 4.4????????? 7.4
Zr Ka????? 41.2??????? 22.3??????? 47.5
Y????????????? 7.5????????? 4.5????????? 11.9
Th?????????? 6.9????????? 1.4????????? 1.5
Fe Ka???? 13.3??????? 7.3????????? 3.7
Fe kb???? 2.7????????? 1.6????????? 1.5
Hf?????????? 2.4????????? 1.4????????? 3.9
U ??????????? 2.0????????? 1.2????????? 2.1
?
Platt is generally low which may be a geometry problem
There some variability between them in Zr, Fe, Y, Hf and Th
Cactus looks pretty good for the most interesting
Dud
?
toggle quoted message
Show quoted text
From: [email protected]
[mailto:[email protected]] On Behalf Of Charles David Young
Sent: Wednesday, January 22, 2020 7:24 AM
To: [email protected]
Subject: Re: [XRF] cyrtolite Little Patsy XRF
?
Here is the addition of the Burnet County, TX cyrtolite:
?
Attached are the scans of both cyrtolites from South
Platte.? The latest also has the id of thorite.
So is it fair to say that that Hf, Zr, and Th are common in
cyrtolites because of substitution?? Also, is the Y due to the xenotime?
I am now scanning the cyrtolite from Cactus Jack.
?
Thanks, Steve!? Hm, what is impressive? I have some 99%
zirconium.? Is that what you mean by a standard?
?
On Tue, Jan 21, 2020 at 7:46 PM WILLIAM S Dubyk <sdubyk@...> wrote:
Charles,
you should have it QA'ed by someone else, but wow, that is impressive. Do you
have a zirconium standard? I've got a zirconium disc if you need one.
Ok, here are the final files.? I'll start the other
South Platte cyrtolite now.
?
On Tue, Jan 21, 2020 at 7:17 PM Dude <dfemer@...> wrote:
Lookin’
good
Dud
?
?
I am still running this scan but the element list is now:
I have also included an intermediate .mca file.
BTW my gamma scans show this is a combination of U238 and Th232 decay
chains.? I have attached scans of various cyrtolites (including this one)
whose Pb212 peaks at 238keV are relatively large, indicating the presence of
Th232.? The Pb214 peak at 295keV indicates U238.
?
?
It is still early but here are some of the strongest peaks:
I'll send the .mca later when I have some decent counts.
|
BTW "Cactus Jack" was initially misidentified when Frank gave it to me.? He later told me that it is in fact from Vado Ranch.
So what makes
Vado interesting?
Charles
On Wed, Jan 22, 2020 at 12:02 PM Dude < dfemer@...> wrote:
Charles,
Assuming everything was kept constant ?here’s the relative
concentration for each cyrtolite
CpsX1000
Patsy???? Platt?????? Cactus
Zr Kb????? 5.9????????? 4.4????????? 7.4
Zr Ka????? 41.2??????? 22.3??????? 47.5
Y????????????? 7.5????????? 4.5????????? 11.9
Th?????????? 6.9????????? 1.4????????? 1.5
Fe Ka???? 13.3??????? 7.3????????? 3.7
Fe kb???? 2.7????????? 1.6????????? 1.5
Hf?????????? 2.4????????? 1.4????????? 3.9
U ??????????? 2.0????????? 1.2????????? 2.1
?
Platt is generally low which may be a geometry problem
There some variability between them in Zr, Fe, Y, Hf and Th
Cactus looks pretty good for the most interesting
Dud
?
?
Here is the addition of the Burnet County, TX cyrtolite:
?
Attached are the scans of both cyrtolites from South
Platte.? The latest also has the id of thorite.
So is it fair to say that that Hf, Zr, and Th are common in
cyrtolites because of substitution?? Also, is the Y due to the xenotime?
I am now scanning the cyrtolite from Cactus Jack.
?
Thanks, Steve!? Hm, what is impressive? I have some 99%
zirconium.? Is that what you mean by a standard?
?
On Tue, Jan 21, 2020 at 7:46 PM WILLIAM S Dubyk <sdubyk@...> wrote:
Charles,
you should have it QA'ed by someone else, but wow, that is impressive. Do you
have a zirconium standard? I've got a zirconium disc if you need one.
Ok, here are the final files.? I'll start the other
South Platte cyrtolite now.
?
On Tue, Jan 21, 2020 at 7:17 PM Dude <dfemer@...> wrote:
Lookin’
good
Dud
?
?
I am still running this scan but the element list is now:
I have also included an intermediate .mca file.
BTW my gamma scans show this is a combination of U238 and Th232 decay
chains.? I have attached scans of various cyrtolites (including this one)
whose Pb212 peaks at 238keV are relatively large, indicating the presence of
Th232.? The Pb214 peak at 295keV indicates U238.
?
?
It is still early but here are some of the strongest peaks:
I'll send the .mca later when I have some decent counts.
|
Charles, here’s the Branchville update.? As the gamma spec
said, U does lead the Th.? Branchville could use a longer count. ?
Assuming everything was kept constant here’s the relative
concentration for each cyrtolite
CpsX1000
??????????????????????? ??? ??????? ?????????Vado
??? Patsy????
Platt?????? Cactus???? Branchville
??????????????????????? ?
Zr Kb????? ??5.9?????????
4.4????????? 7.4?????? ? 8.8
Zr Ka?????
41.2???????
22.3??????? 47.5??????? 90.4
Y?????????????
7.5?????????
4.5?????????11.9?????? ? 6.5
Fe Ka????
13.3??????? ?7.3?????????
??3.7?????? ? 7.6
Fe Kb????? ?2.7?????????
1.6?????? ??? 1.5?????? ? 2.5
Hf??????????
2.4?????????
1.4????????? ? 3.9??????? ?4.7
U
???????????
2.0?????????
1.2????????? ?2.1??????? ? 7.8
Th????????? ?
6.9?????????
1.4???????? ? 1.5??????? ? 3.5
?
Platt is generally low which may be a geometry problem
There is some variability between them in Zr, Fe, Y, Hf, U
and Th
Cactus (Vado) looks pretty good for the most interesting? REE
path finder’s Y & Hf.
This is a quick first look, it can be tuned a lot better if
required.
Dud
?
?
toggle quoted message
Show quoted text
From: [email protected]
[mailto:[email protected]] On Behalf Of Charles David Young
Sent: Wednesday, January 22, 2020 1:25 PM
To: [email protected]
Subject: Re: [XRF] cyrtolite Little Patsy XRF
?
BTW "Cactus Jack" was initially misidentified when
Frank gave it to me.? He later told me that it is in fact from Vado Ranch.
So what makes Vado interesting? REE path finder’s Y &
Hf
?
?
Here
is the addition of the Burnet County, TX cyrtolite:
?
Attached
are the scans of both cyrtolites from South Platte.? The latest also has
the id of thorite.
So
is it fair to say that that Hf, Zr, and Th are common in cyrtolites because of
substitution?? Also, is the Y due to the xenotime?
I
am now scanning the cyrtolite from Cactus Jack.
?
Thanks,
Steve!? Hm, what is impressive? I have some 99% zirconium.? Is that
what you mean by a standard?
?
On
Tue, Jan 21, 2020 at 7:46 PM WILLIAM S Dubyk <sdubyk@...> wrote:
Charles, you should have
it QA'ed by someone else, but wow, that is impressive. Do you have a zirconium
standard? I've got a zirconium disc if you need one.
Ok,
here are the final files.? I'll start the other South Platte cyrtolite
now.
?
On
Tue, Jan 21, 2020 at 7:17 PM Dude <dfemer@...> wrote:
Lookin’
good
Dud
?
?
I am still running this scan but the element list is now:
I have also included an intermediate .mca file.
BTW my gamma scans show this is a combination of U238 and Th232 decay chains.?
I have attached scans of various cyrtolites (including this one) whose Pb212
peaks at 238keV are relatively large, indicating the presence of Th232.?
The Pb214 peak at 295keV indicates U238.
?
?
It is still early but here are some of the strongest peaks:
I'll send the .mca later when I have some decent counts.
|
Branchville was stopped early once I saw the trend.
REE path finder’s Y & Hf?
?Charles
El El mié, ene. 22, 2020 a la(s) 7:07 p.?m., Dude < dfemer@...> escribió:
Charles, here’s the Branchville update.? As the gamma spec
said, U does lead the Th.? Branchville could use a longer count. ?
Assuming everything was kept constant here’s the relative
concentration for each cyrtolite
CpsX1000
??????????????????????? ??? ??????? ?????????Vado
??? Patsy????
Platt?????? Cactus???? Branchville
??????????????????????? ?
Zr Kb????? ??5.9?????????
4.4????????? 7.4?????? ? 8.8
Zr Ka?????
41.2???????
22.3??????? 47.5??????? 90.4
Y?????????????
7.5?????????
4.5?????????11.9?????? ? 6.5
Fe Ka????
13.3??????? ?7.3?????????
??3.7?????? ? 7.6
Fe Kb????? ?2.7?????????
1.6?????? ??? 1.5?????? ? 2.5
Hf??????????
2.4?????????
1.4????????? ? 3.9??????? ?4.7
U
???????????
2.0?????????
1.2????????? ?2.1??????? ? 7.8
Th????????? ?
6.9?????????
1.4???????? ? 1.5??????? ? 3.5
?
Platt is generally low which may be a geometry problem
There is some variability between them in Zr, Fe, Y, Hf, U
and Th
Cactus (Vado) looks pretty good for the most interesting? REE
path finder’s Y & Hf.
This is a quick first look, it can be tuned a lot better if
required.
Dud
?
?
?
BTW "Cactus Jack" was initially misidentified when
Frank gave it to me.? He later told me that it is in fact from Vado Ranch.
So what makes Vado interesting? REE path finder’s Y &
Hf
?
?
Here
is the addition of the Burnet County, TX cyrtolite:
?
Attached
are the scans of both cyrtolites from South Platte.? The latest also has
the id of thorite.
So
is it fair to say that that Hf, Zr, and Th are common in cyrtolites because of
substitution?? Also, is the Y due to the xenotime?
I
am now scanning the cyrtolite from Cactus Jack.
?
Thanks,
Steve!? Hm, what is impressive? I have some 99% zirconium.? Is that
what you mean by a standard?
?
On
Tue, Jan 21, 2020 at 7:46 PM WILLIAM S Dubyk <sdubyk@...> wrote:
Charles, you should have
it QA'ed by someone else, but wow, that is impressive. Do you have a zirconium
standard? I've got a zirconium disc if you need one.
Ok,
here are the final files.? I'll start the other South Platte cyrtolite
now.
?
On
Tue, Jan 21, 2020 at 7:17 PM Dude <dfemer@...> wrote:
Lookin’
good
Dud
?
?
I am still running this scan but the element list is now:
I have also included an intermediate .mca file.
BTW my gamma scans show this is a combination of U238 and Th232 decay chains.?
I have attached scans of various cyrtolites (including this one) whose Pb212
peaks at 238keV are relatively large, indicating the presence of Th232.?
The Pb214 peak at 295keV indicates U238.
?
?
It is still early but here are some of the strongest peaks:
I'll send the .mca later when I have some decent counts.
|
Pretty interesting data, folks. U is generally higher in zircon than Th but the north end of the South Platte is quite different. Other high Th zircons are Mt. Malosa (Malawi) and SW Oklahoma; got some of those too but they are not cyrtolite in my opinion.
I think the Platt sample is the elbow twin, is that correct, Charles? I have one more from that area, I think the Luster mine, and I can send it if you would like to take a look at it; weird looking thing but labeled as cyrtolite. The Branchville peg in the
NE US is a totally different animal, I do have a some very small specimens of cyrtolite from Maine that are also pretty unusual.
Vado is well west of the Cactus, I think that is what Frank said. I think Frank may have some detailed analyses from the Llano area. We should find out.
I attached a portion of a talk on the Petaca that Mike Spilde gave at the Microscopy and Microanalysis convention in Portland on the analyses several years ago, you will likely understand it more than I do, it does have to do with standards. I do not
think he uses pure samples, maybe for calibration of concentrations?
I talked to Mel, he does not have the xrf from NMT, I will get in touch with them and if they do not, maybe get the analyses done again, I have the sample.
Steve
toggle quoted message
Show quoted text
Branchville was stopped early once I saw the trend.
REE path finder’s Y & Hf?
?Charles
El El mié, ene. 22, 2020 a la(s) 7:07 p.?m., Dude < dfemer@...> escribió:
Charles, here’s the Branchville update.? As the gamma spec said, U does lead the Th.? Branchville could use a longer count. ?
Assuming everything was kept constant here’s the relative concentration for each cyrtolite
CpsX1000
??????????????????????? ??? ??????? ?????????Vado
??? Patsy???? Platt?????? Cactus???? Branchville
??????????????????????? ?
Zr Kb????? ??5.9????????? 4.4????????? 7.4?????? ? 8.8
Zr Ka????? 41.2??????? 22.3??????? 47.5??????? 90.4
Y????????????? 7.5????????? 4.5?????????11.9?????? ? 6.5
Fe Ka???? 13.3??????? ?7.3????????? ??3.7?????? ? 7.6
Fe Kb????? ?2.7????????? 1.6?????? ??? 1.5?????? ? 2.5
Hf?????????? 2.4????????? 1.4????????? ? 3.9??????? ?4.7
U ??????????? 2.0????????? 1.2????????? ?2.1??????? ? 7.8
Th????????? ? 6.9????????? 1.4???????? ? 1.5??????? ? 3.5
?
Platt is generally low which may be a geometry problem
There is some variability between them in Zr, Fe, Y, Hf, U and Th
Cactus (Vado) looks pretty good for the most interesting?
REE path finder’s Y & Hf.
This is a quick first look, it can be tuned a lot better if required.
Dud
?
?
?
BTW "Cactus Jack" was initially misidentified when Frank gave it to me.? He later told me that it is in fact from Vado Ranch.
So what makes Vado interesting? REE path finder’s Y & Hf
?
?
Here is the addition of the Burnet County, TX cyrtolite:
?
Attached are the scans of both cyrtolites from South Platte.? The latest also has the id of thorite.
So is it fair to say that that Hf, Zr, and Th are common in cyrtolites because of substitution?? Also, is the Y due to the xenotime?
I am now scanning the cyrtolite from Cactus Jack.
?
Thanks, Steve!? Hm, what is impressive? I have some 99% zirconium.? Is that what you mean by a standard?
?
On Tue, Jan 21, 2020 at 7:46 PM WILLIAM S Dubyk <sdubyk@...> wrote:
Charles, you should have it QA'ed by someone else, but wow, that is impressive. Do you have a zirconium standard? I've got a zirconium disc if you need one.
Ok, here are the final files.? I'll start the other South Platte cyrtolite now.
?
On Tue, Jan 21, 2020 at 7:17 PM Dude <dfemer@...> wrote:
Lookin’ good
Dud
?
?
I am still running this scan but the element list is now:
I have also included an intermediate .mca file.
BTW my gamma scans show this is a combination of U238 and Th232 decay chains.? I have attached scans of various cyrtolites (including this one) whose Pb212 peaks at 238keV are relatively large, indicating the presence of Th232.? The Pb214 peak at 295keV
indicates U238.
?
?
It is still early but here are some of the strongest peaks:
I'll send the .mca later when I have some decent counts.
|
I had not seen this.? I'll have to take note: Mineral classification:? Euxenite = High Nb+Y? Polycrase = High Ti+Y? Microlite = High Ta+Ca
Yes the Platte is what you called the star twin.? It is really striking.
BTW it seems that you can see the Th content by just doing a gamma spec.? If the 238 peak is large compared to the other daughters then it will have high Th content. At least that is the way it appears based on these few specimens.
So I'll repeat a question about the cyrtolites.? Is the Y content due to xenotime?
Charles
El El mié, ene. 22, 2020 a la(s) 9:41 p.?m., WILLIAM S Dubyk < sdubyk@...> escribió:
Pretty interesting data, folks. U is generally higher in zircon than Th but the north end of the South Platte is quite different. Other high Th zircons are Mt. Malosa (Malawi) and SW Oklahoma; got some of those too but they are not cyrtolite in my opinion.
I think the Platt sample is the elbow twin, is that correct, Charles? I have one more from that area, I think the Luster mine, and I can send it if you would like to take a look at it; weird looking thing but labeled as cyrtolite. The Branchville peg in the
NE US is a totally different animal, I do have a some very small specimens of cyrtolite from Maine that are also pretty unusual.
Vado is well west of the Cactus, I think that is what Frank said. I think Frank may have some detailed analyses from the Llano area. We should find out.
I attached a portion of a talk on the Petaca that Mike Spilde gave at the Microscopy and Microanalysis convention in Portland on the analyses several years ago, you will likely understand it more than I do, it does have to do with standards. I do not
think he uses pure samples, maybe for calibration of concentrations?
I talked to Mel, he does not have the xrf from NMT, I will get in touch with them and if they do not, maybe get the analyses done again, I have the sample.
Steve
Branchville was stopped early once I saw the trend.
REE path finder’s Y & Hf?
?Charles
El El mié, ene. 22, 2020 a la(s) 7:07 p.?m., Dude < dfemer@...> escribió:
Charles, here’s the Branchville update.? As the gamma spec said, U does lead the Th.? Branchville could use a longer count. ?
Assuming everything was kept constant here’s the relative concentration for each cyrtolite
CpsX1000
??????????????????????? ??? ??????? ?????????Vado
??? Patsy???? Platt?????? Cactus???? Branchville
??????????????????????? ?
Zr Kb????? ??5.9????????? 4.4????????? 7.4?????? ? 8.8
Zr Ka????? 41.2??????? 22.3??????? 47.5??????? 90.4
Y????????????? 7.5????????? 4.5?????????11.9?????? ? 6.5
Fe Ka???? 13.3??????? ?7.3????????? ??3.7?????? ? 7.6
Fe Kb????? ?2.7????????? 1.6?????? ??? 1.5?????? ? 2.5
Hf?????????? 2.4????????? 1.4????????? ? 3.9??????? ?4.7
U ??????????? 2.0????????? 1.2????????? ?2.1??????? ? 7.8
Th????????? ? 6.9????????? 1.4???????? ? 1.5??????? ? 3.5
?
Platt is generally low which may be a geometry problem
There is some variability between them in Zr, Fe, Y, Hf, U and Th
Cactus (Vado) looks pretty good for the most interesting?
REE path finder’s Y & Hf.
This is a quick first look, it can be tuned a lot better if required.
Dud
?
?
?
BTW "Cactus Jack" was initially misidentified when Frank gave it to me.? He later told me that it is in fact from Vado Ranch.
So what makes Vado interesting? REE path finder’s Y & Hf
?
?
Here is the addition of the Burnet County, TX cyrtolite:
?
Attached are the scans of both cyrtolites from South Platte.? The latest also has the id of thorite.
So is it fair to say that that Hf, Zr, and Th are common in cyrtolites because of substitution?? Also, is the Y due to the xenotime?
I am now scanning the cyrtolite from Cactus Jack.
?
Thanks, Steve!? Hm, what is impressive? I have some 99% zirconium.? Is that what you mean by a standard?
?
On Tue, Jan 21, 2020 at 7:46 PM WILLIAM S Dubyk <sdubyk@...> wrote:
Charles, you should have it QA'ed by someone else, but wow, that is impressive. Do you have a zirconium standard? I've got a zirconium disc if you need one.
Ok, here are the final files.? I'll start the other South Platte cyrtolite now.
?
On Tue, Jan 21, 2020 at 7:17 PM Dude <dfemer@...> wrote:
Lookin’ good
Dud
?
?
I am still running this scan but the element list is now:
I have also included an intermediate .mca file.
BTW my gamma scans show this is a combination of U238 and Th232 decay chains.? I have attached scans of various cyrtolites (including this one) whose Pb212 peaks at 238keV are relatively large, indicating the presence of Th232.? The Pb214 peak at 295keV
indicates U238.
?
?
It is still early but here are some of the strongest peaks:
I'll send the .mca later when I have some decent counts.
|
I did the gamma spec on these and frankly the Th is quite dominant in some. I use uranothorite as the standard for comparison. Yes, if the Y gets high enough and P is available it will form inclusions of xenotime, in fact that is very well known in zircon.
Just like if the Ag gets too high in galena ( PbS), if forms inclusions of argentite (Ag2S). This is very common in minerals, most do not accept excessive amounts of an element that does not quite fit in with the crystal structure.
I also have Canadian cyrtolites from Davis, MacDonald, JG Gole and Saranac if you want to take a look at those for comparison.
Steve
toggle quoted message
Show quoted text
I had not seen this.? I'll have to take note:
Mineral classification:?
Euxenite = High Nb+Y?
Polycrase = High Ti+Y?
Microlite = High Ta+Ca
Yes the Platte is what you called the star twin.? It is really striking.
BTW it seems that you can see the Th content by just doing a gamma spec.? If the 238 peak is large compared to the other daughters then it will have high Th content. At least that is the way it appears based on these few specimens.
So I'll repeat a question about the cyrtolites.? Is the Y content due to xenotime?
Charles
El El mié, ene. 22, 2020 a la(s) 9:41 p.?m., WILLIAM S Dubyk < sdubyk@...> escribió:
Pretty interesting data, folks. U is generally higher in zircon than Th but the north end of the South Platte is quite different. Other high Th zircons are Mt. Malosa (Malawi) and SW Oklahoma; got some of those too but they are not cyrtolite in my opinion.
I think the Platt sample is the elbow twin, is that correct, Charles? I have one more from that area, I think the Luster mine, and I can send it if you would like to take a look at it; weird looking thing but labeled as cyrtolite. The Branchville peg in the
NE US is a totally different animal, I do have a some very small specimens of cyrtolite from Maine that are also pretty unusual.
Vado is well west of the Cactus, I think that is what Frank said. I think Frank may have some detailed analyses from the Llano area. We should find out.
I attached a portion of a talk on the Petaca that Mike Spilde gave at the Microscopy and Microanalysis convention in Portland on the analyses several years ago, you will likely understand it more than I do, it does have to do with standards. I do not
think he uses pure samples, maybe for calibration of concentrations?
I talked to Mel, he does not have the xrf from NMT, I will get in touch with them and if they do not, maybe get the analyses done again, I have the sample.
Steve
Branchville was stopped early once I saw the trend.
REE path finder’s Y & Hf?
?Charles
El El mié, ene. 22, 2020 a la(s) 7:07 p.?m., Dude < dfemer@...> escribió:
Charles, here’s the Branchville update.? As the gamma spec said, U does lead the Th.? Branchville could use a longer count. ?
Assuming everything was kept constant here’s the relative concentration for each cyrtolite
CpsX1000
??????????????????????? ??? ??????? ?????????Vado
??? Patsy???? Platt?????? Cactus???? Branchville
??????????????????????? ?
Zr Kb????? ??5.9????????? 4.4????????? 7.4?????? ? 8.8
Zr Ka????? 41.2??????? 22.3??????? 47.5??????? 90.4
Y????????????? 7.5????????? 4.5?????????11.9?????? ? 6.5
Fe Ka???? 13.3??????? ?7.3????????? ??3.7?????? ? 7.6
Fe Kb????? ?2.7????????? 1.6?????? ??? 1.5?????? ? 2.5
Hf?????????? 2.4????????? 1.4????????? ? 3.9??????? ?4.7
U ??????????? 2.0????????? 1.2????????? ?2.1??????? ? 7.8
Th????????? ? 6.9????????? 1.4???????? ? 1.5??????? ? 3.5
?
Platt is generally low which may be a geometry problem
There is some variability between them in Zr, Fe, Y, Hf, U and Th
Cactus (Vado) looks pretty good for the most interesting? REE path finder’s Y & Hf.
This is a quick first look, it can be tuned a lot better if required.
Dud
?
?
?
BTW "Cactus Jack" was initially misidentified when Frank gave it to me.? He later told me that it is in fact from Vado Ranch.
So what makes Vado interesting? REE path finder’s Y & Hf
?
?
Here is the addition of the Burnet County, TX cyrtolite:
?
Attached are the scans of both cyrtolites from South Platte.? The latest also has the id of thorite.
So is it fair to say that that Hf, Zr, and Th are common in cyrtolites because of substitution?? Also, is the Y due to the xenotime?
I am now scanning the cyrtolite from Cactus Jack.
?
Thanks, Steve!? Hm, what is impressive? I have some 99% zirconium.? Is that what you mean by a standard?
?
On Tue, Jan 21, 2020 at 7:46 PM WILLIAM S Dubyk <sdubyk@...> wrote:
Charles, you should have it QA'ed by someone else, but wow, that is impressive. Do you have a zirconium standard? I've got a zirconium disc if you need one.
Ok, here are the final files.? I'll start the other South Platte cyrtolite now.
?
On Tue, Jan 21, 2020 at 7:17 PM Dude <dfemer@...> wrote:
Lookin’ good
Dud
?
?
I am still running this scan but the element list is now:
I have also included an intermediate .mca file.
BTW my gamma scans show this is a combination of U238 and Th232 decay chains.? I have attached scans of various cyrtolites (including this one) whose Pb212 peaks at 238keV are relatively large, indicating the presence of Th232.? The Pb214 peak at 295keV
indicates U238.
?
?
It is still early but here are some of the strongest peaks:
I'll send the .mca later when I have some decent counts.
|
Steve,
What I hear you saying is that if Y is present when cyrtolite is forming then it will be gladly accepted into the structure as xenotime just because it is structurally similar.? Does this relate to the proportion of U and Th?
Charles
On Wed, Jan 22, 2020 at 10:38 PM WILLIAM S Dubyk < sdubyk@...> wrote:
I did the gamma spec on these and frankly the Th is quite dominant in some. I use uranothorite as the standard for comparison. Yes, if the Y gets high enough and P is available it will form inclusions of xenotime, in fact that is very well known in zircon.
Just like if the Ag gets too high in galena ( PbS), if forms inclusions of argentite (Ag2S). This is very common in minerals, most do not accept excessive amounts of an element that does not quite fit in with the crystal structure.
I also have Canadian cyrtolites from Davis, MacDonald, JG Gole and Saranac if you want to take a look at those for comparison.
Steve
I had not seen this.? I'll have to take note:
Mineral classification:?
Euxenite = High Nb+Y?
Polycrase = High Ti+Y?
Microlite = High Ta+Ca
Yes the Platte is what you called the star twin.? It is really striking.
BTW it seems that you can see the Th content by just doing a gamma spec.? If the 238 peak is large compared to the other daughters then it will have high Th content. At least that is the way it appears based on these few specimens.
So I'll repeat a question about the cyrtolites.? Is the Y content due to xenotime?
Charles
El El mié, ene. 22, 2020 a la(s) 9:41 p.?m., WILLIAM S Dubyk < sdubyk@...> escribió:
Pretty interesting data, folks. U is generally higher in zircon than Th but the north end of the South Platte is quite different. Other high Th zircons are Mt. Malosa (Malawi) and SW Oklahoma; got some of those too but they are not cyrtolite in my opinion.
I think the Platt sample is the elbow twin, is that correct, Charles? I have one more from that area, I think the Luster mine, and I can send it if you would like to take a look at it; weird looking thing but labeled as cyrtolite. The Branchville peg in the
NE US is a totally different animal, I do have a some very small specimens of cyrtolite from Maine that are also pretty unusual.
Vado is well west of the Cactus, I think that is what Frank said. I think Frank may have some detailed analyses from the Llano area. We should find out.
I attached a portion of a talk on the Petaca that Mike Spilde gave at the Microscopy and Microanalysis convention in Portland on the analyses several years ago, you will likely understand it more than I do, it does have to do with standards. I do not
think he uses pure samples, maybe for calibration of concentrations?
I talked to Mel, he does not have the xrf from NMT, I will get in touch with them and if they do not, maybe get the analyses done again, I have the sample.
Steve
Branchville was stopped early once I saw the trend.
REE path finder’s Y & Hf?
?Charles
El El mié, ene. 22, 2020 a la(s) 7:07 p.?m., Dude < dfemer@...> escribió:
Charles, here’s the Branchville update.? As the gamma spec said, U does lead the Th.? Branchville could use a longer count. ?
Assuming everything was kept constant here’s the relative concentration for each cyrtolite
CpsX1000
??????????????????????? ??? ??????? ?????????Vado
??? Patsy???? Platt?????? Cactus???? Branchville
??????????????????????? ?
Zr Kb????? ??5.9????????? 4.4????????? 7.4?????? ? 8.8
Zr Ka????? 41.2??????? 22.3??????? 47.5??????? 90.4
Y????????????? 7.5????????? 4.5?????????11.9?????? ? 6.5
Fe Ka???? 13.3??????? ?7.3????????? ??3.7?????? ? 7.6
Fe Kb????? ?2.7????????? 1.6?????? ??? 1.5?????? ? 2.5
Hf?????????? 2.4????????? 1.4????????? ? 3.9??????? ?4.7
U ??????????? 2.0????????? 1.2????????? ?2.1??????? ? 7.8
Th????????? ? 6.9????????? 1.4???????? ? 1.5??????? ? 3.5
?
Platt is generally low which may be a geometry problem
There is some variability between them in Zr, Fe, Y, Hf, U and Th
Cactus (Vado) looks pretty good for the most interesting? REE path finder’s Y & Hf.
This is a quick first look, it can be tuned a lot better if required.
Dud
?
?
?
BTW "Cactus Jack" was initially misidentified when Frank gave it to me.? He later told me that it is in fact from Vado Ranch.
So what makes Vado interesting? REE path finder’s Y & Hf
?
?
Here is the addition of the Burnet County, TX cyrtolite:
?
Attached are the scans of both cyrtolites from South Platte.? The latest also has the id of thorite.
So is it fair to say that that Hf, Zr, and Th are common in cyrtolites because of substitution?? Also, is the Y due to the xenotime?
I am now scanning the cyrtolite from Cactus Jack.
?
Thanks, Steve!? Hm, what is impressive? I have some 99% zirconium.? Is that what you mean by a standard?
?
On Tue, Jan 21, 2020 at 7:46 PM WILLIAM S Dubyk <sdubyk@...> wrote:
Charles, you should have it QA'ed by someone else, but wow, that is impressive. Do you have a zirconium standard? I've got a zirconium disc if you need one.
Ok, here are the final files.? I'll start the other South Platte cyrtolite now.
?
On Tue, Jan 21, 2020 at 7:17 PM Dude <dfemer@...> wrote:
Lookin’ good
Dud
?
?
I am still running this scan but the element list is now:
I have also included an intermediate .mca file.
BTW my gamma scans show this is a combination of U238 and Th232 decay chains.? I have attached scans of various cyrtolites (including this one) whose Pb212 peaks at 238keV are relatively large, indicating the presence of Th232.? The Pb214 peak at 295keV
indicates U238.
?
?
It is still early but here are some of the strongest peaks:
I'll send the .mca later when I have some decent counts.
|
Charles, it does not work quite that way. Imagine a crystal lattice, in this case zircon. Zircon is made from the cations Zr and Hf, and the anions Si and O. That's it. Cyrtolite, the variety of zircon, is a rapidly forming mineral in a fluid full of
incompatible elements, those that don't fit in well with other common minerals. Zircon will accept a small portion of these elements into it's structure, like Y, U, Th, and P. But after a certain point, when that structure gets strained, the zircon bouncer
at the door will say "get out". Those elements will be exsolved from the structure and then form their own minerals as inclusions or intergrowths. Remember, elements with the same charge have different ionic radiuses and those will not fit into the zircon
lattice. What they share is the crystal structure, in this case tetragonal.
The same things goes for inclusions in columbite such as euxenite/polycrase, or thorite inclusions in monazite, or argentite inclusions in galena.
Steve
toggle quoted message
Show quoted text
Steve,
What I hear you saying is that if Y is present when cyrtolite is forming then it will be gladly accepted into the structure as xenotime just because it is structurally similar.? Does this relate to the proportion of U and Th?
Charles
On Wed, Jan 22, 2020 at 10:38 PM WILLIAM S Dubyk < sdubyk@...> wrote:
I did the gamma spec on these and frankly the Th is quite dominant in some. I use uranothorite as the standard for comparison. Yes, if the Y gets high enough and P is available it will form inclusions of xenotime, in fact that is very well known in zircon.
Just like if the Ag gets too high in galena ( PbS), if forms inclusions of argentite (Ag2S). This is very common in minerals, most do not accept excessive amounts of an element that does not quite fit in with the crystal structure.
I also have Canadian cyrtolites from Davis, MacDonald, JG Gole and Saranac if you want to take a look at those for comparison.
Steve
I had not seen this.? I'll have to take note:
Mineral classification:?
Euxenite = High Nb+Y?
Polycrase = High Ti+Y?
Microlite = High Ta+Ca
Yes the Platte is what you called the star twin.? It is really striking.
BTW it seems that you can see the Th content by just doing a gamma spec.? If the 238 peak is large compared to the other daughters then it will have high Th content. At least that is the way it appears based on these few specimens.
So I'll repeat a question about the cyrtolites.? Is the Y content due to xenotime?
Charles
El El mié, ene. 22, 2020 a la(s) 9:41 p.?m., WILLIAM S Dubyk < sdubyk@...> escribió:
Pretty interesting data, folks. U is generally higher in zircon than Th but the north end of the South Platte is quite different. Other high Th zircons are Mt. Malosa (Malawi) and SW Oklahoma; got some of those too but they are not cyrtolite in my opinion.
I think the Platt sample is the elbow twin, is that correct, Charles? I have one more from that area, I think the Luster mine, and I can send it if you would like to take a look at it; weird looking thing but labeled as cyrtolite. The Branchville peg in the
NE US is a totally different animal, I do have a some very small specimens of cyrtolite from Maine that are also pretty unusual.
Vado is well west of the Cactus, I think that is what Frank said. I think Frank may have some detailed analyses from the Llano area. We should find out.
I attached a portion of a talk on the Petaca that Mike Spilde gave at the Microscopy and Microanalysis convention in Portland on the analyses several years ago, you will likely understand it more than I do, it does have to do with standards. I do not
think he uses pure samples, maybe for calibration of concentrations?
I talked to Mel, he does not have the xrf from NMT, I will get in touch with them and if they do not, maybe get the analyses done again, I have the sample.
Steve
Branchville was stopped early once I saw the trend.
REE path finder’s Y & Hf?
?Charles
El El mié, ene. 22, 2020 a la(s) 7:07 p.?m., Dude < dfemer@...> escribió:
Charles, here’s the Branchville update.? As the gamma spec said, U does lead the Th.? Branchville could use a longer count. ?
Assuming everything was kept constant here’s the relative concentration for each cyrtolite
CpsX1000
??????????????????????? ??? ??????? ?????????Vado
??? Patsy???? Platt?????? Cactus???? Branchville
??????????????????????? ?
Zr Kb????? ??5.9????????? 4.4????????? 7.4?????? ? 8.8
Zr Ka????? 41.2??????? 22.3??????? 47.5??????? 90.4
Y????????????? 7.5????????? 4.5?????????11.9?????? ? 6.5
Fe Ka???? 13.3??????? ?7.3????????? ??3.7?????? ? 7.6
Fe Kb????? ?2.7????????? 1.6?????? ??? 1.5?????? ? 2.5
Hf?????????? 2.4????????? 1.4????????? ? 3.9??????? ?4.7
U ??????????? 2.0????????? 1.2????????? ?2.1??????? ? 7.8
Th????????? ? 6.9????????? 1.4???????? ? 1.5??????? ? 3.5
?
Platt is generally low which may be a geometry problem
There is some variability between them in Zr, Fe, Y, Hf, U and Th
Cactus (Vado) looks pretty good for the most interesting? REE path finder’s Y & Hf.
This is a quick first look, it can be tuned a lot better if required.
Dud
?
?
?
BTW "Cactus Jack" was initially misidentified when Frank gave it to me.? He later told me that it is in fact from Vado Ranch.
So what makes Vado interesting? REE path finder’s Y & Hf
?
?
Here is the addition of the Burnet County, TX cyrtolite:
?
Attached are the scans of both cyrtolites from South Platte.? The latest also has the id of thorite.
So is it fair to say that that Hf, Zr, and Th are common in cyrtolites because of substitution?? Also, is the Y due to the xenotime?
I am now scanning the cyrtolite from Cactus Jack.
?
Thanks, Steve!? Hm, what is impressive? I have some 99% zirconium.? Is that what you mean by a standard?
?
On Tue, Jan 21, 2020 at 7:46 PM WILLIAM S Dubyk <sdubyk@...> wrote:
Charles, you should have it QA'ed by someone else, but wow, that is impressive. Do you have a zirconium standard? I've got a zirconium disc if you need one.
Ok, here are the final files.? I'll start the other South Platte cyrtolite now.
?
On Tue, Jan 21, 2020 at 7:17 PM Dude <dfemer@...> wrote:
Lookin’ good
Dud
?
?
I am still running this scan but the element list is now:
I have also included an intermediate .mca file.
BTW my gamma scans show this is a combination of U238 and Th232 decay chains.? I have attached scans of various cyrtolites (including this one) whose Pb212 peaks at 238keV are relatively large, indicating the presence of Th232.? The Pb214 peak at 295keV
indicates U238.
?
?
It is still early but here are some of the strongest peaks:
I'll send the .mca later when I have some decent counts.
|
Steve,
Here is the cyrtolite malacon from Madagascar vs the cyrtolite from South Platte.? It appears to have relatively more Zr and less Fe.? Does that comport with malacon?
So I guess what you are saying is that the exsolved minerals in the inclusions can be almost anything and in this case just happen to be
Y, U, Th (because they don't fit well with other minerals that formed earlier?).? So why is there such strong association between Zr and Hf?
Charles
On Thu, Jan 23, 2020 at 7:59 PM WILLIAM S Dubyk < sdubyk@...> wrote:
Charles, it does not work quite that way. Imagine a crystal lattice, in this case zircon. Zircon is made from the cations Zr and Hf, and the anions Si and O. That's it. Cyrtolite, the variety of zircon, is a rapidly forming mineral in a fluid full of
incompatible elements, those that don't fit in well with other common minerals. Zircon will accept a small portion of these elements into it's structure, like Y, U, Th, and P. But after a certain point, when that structure gets strained, the zircon bouncer
at the door will say "get out". Those elements will be exsolved from the structure and then form their own minerals as inclusions or intergrowths. Remember, elements with the same charge have different ionic radiuses and those will not fit into the zircon
lattice. What they share is the crystal structure, in this case tetragonal.
The same things goes for inclusions in columbite such as euxenite/polycrase, or thorite inclusions in monazite, or argentite inclusions in galena.
Steve
Steve,
What I hear you saying is that if Y is present when cyrtolite is forming then it will be gladly accepted into the structure as xenotime just because it is structurally similar.? Does this relate to the proportion of U and Th?
Charles
On Wed, Jan 22, 2020 at 10:38 PM WILLIAM S Dubyk < sdubyk@...> wrote:
I did the gamma spec on these and frankly the Th is quite dominant in some. I use uranothorite as the standard for comparison. Yes, if the Y gets high enough and P is available it will form inclusions of xenotime, in fact that is very well known in zircon.
Just like if the Ag gets too high in galena ( PbS), if forms inclusions of argentite (Ag2S). This is very common in minerals, most do not accept excessive amounts of an element that does not quite fit in with the crystal structure.
I also have Canadian cyrtolites from Davis, MacDonald, JG Gole and Saranac if you want to take a look at those for comparison.
Steve
I had not seen this.? I'll have to take note:
Mineral classification:?
Euxenite = High Nb+Y?
Polycrase = High Ti+Y?
Microlite = High Ta+Ca
Yes the Platte is what you called the star twin.? It is really striking.
BTW it seems that you can see the Th content by just doing a gamma spec.? If the 238 peak is large compared to the other daughters then it will have high Th content. At least that is the way it appears based on these few specimens.
So I'll repeat a question about the cyrtolites.? Is the Y content due to xenotime?
Charles
El El mié, ene. 22, 2020 a la(s) 9:41 p.?m., WILLIAM S Dubyk < sdubyk@...> escribió:
Pretty interesting data, folks. U is generally higher in zircon than Th but the north end of the South Platte is quite different. Other high Th zircons are Mt. Malosa (Malawi) and SW Oklahoma; got some of those too but they are not cyrtolite in my opinion.
I think the Platt sample is the elbow twin, is that correct, Charles? I have one more from that area, I think the Luster mine, and I can send it if you would like to take a look at it; weird looking thing but labeled as cyrtolite. The Branchville peg in the
NE US is a totally different animal, I do have a some very small specimens of cyrtolite from Maine that are also pretty unusual.
Vado is well west of the Cactus, I think that is what Frank said. I think Frank may have some detailed analyses from the Llano area. We should find out.
I attached a portion of a talk on the Petaca that Mike Spilde gave at the Microscopy and Microanalysis convention in Portland on the analyses several years ago, you will likely understand it more than I do, it does have to do with standards. I do not
think he uses pure samples, maybe for calibration of concentrations?
I talked to Mel, he does not have the xrf from NMT, I will get in touch with them and if they do not, maybe get the analyses done again, I have the sample.
Steve
Branchville was stopped early once I saw the trend.
REE path finder’s Y & Hf?
?Charles
El El mié, ene. 22, 2020 a la(s) 7:07 p.?m., Dude < dfemer@...> escribió:
Charles, here’s the Branchville update.? As the gamma spec said, U does lead the Th.? Branchville could use a longer count. ?
Assuming everything was kept constant here’s the relative concentration for each cyrtolite
CpsX1000
??????????????????????? ??? ??????? ?????????Vado
??? Patsy???? Platt?????? Cactus???? Branchville
??????????????????????? ?
Zr Kb????? ??5.9????????? 4.4????????? 7.4?????? ? 8.8
Zr Ka????? 41.2??????? 22.3??????? 47.5??????? 90.4
Y????????????? 7.5????????? 4.5?????????11.9?????? ? 6.5
Fe Ka???? 13.3??????? ?7.3????????? ??3.7?????? ? 7.6
Fe Kb????? ?2.7????????? 1.6?????? ??? 1.5?????? ? 2.5
Hf?????????? 2.4????????? 1.4????????? ? 3.9??????? ?4.7
U ??????????? 2.0????????? 1.2????????? ?2.1??????? ? 7.8
Th????????? ? 6.9????????? 1.4???????? ? 1.5??????? ? 3.5
?
Platt is generally low which may be a geometry problem
There is some variability between them in Zr, Fe, Y, Hf, U and Th
Cactus (Vado) looks pretty good for the most interesting? REE path finder’s Y & Hf.
This is a quick first look, it can be tuned a lot better if required.
Dud
?
?
?
BTW "Cactus Jack" was initially misidentified when Frank gave it to me.? He later told me that it is in fact from Vado Ranch.
So what makes Vado interesting? REE path finder’s Y & Hf
?
?
Here is the addition of the Burnet County, TX cyrtolite:
?
Attached are the scans of both cyrtolites from South Platte.? The latest also has the id of thorite.
So is it fair to say that that Hf, Zr, and Th are common in cyrtolites because of substitution?? Also, is the Y due to the xenotime?
I am now scanning the cyrtolite from Cactus Jack.
?
Thanks, Steve!? Hm, what is impressive? I have some 99% zirconium.? Is that what you mean by a standard?
?
On Tue, Jan 21, 2020 at 7:46 PM WILLIAM S Dubyk <sdubyk@...> wrote:
Charles, you should have it QA'ed by someone else, but wow, that is impressive. Do you have a zirconium standard? I've got a zirconium disc if you need one.
Ok, here are the final files.? I'll start the other South Platte cyrtolite now.
?
On Tue, Jan 21, 2020 at 7:17 PM Dude <dfemer@...> wrote:
Lookin’ good
Dud
?
?
I am still running this scan but the element list is now:
I have also included an intermediate .mca file.
BTW my gamma scans show this is a combination of U238 and Th232 decay chains.? I have attached scans of various cyrtolites (including this one) whose Pb212 peaks at 238keV are relatively large, indicating the presence of Th232.? The Pb214 peak at 295keV
indicates U238.
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It is still early but here are some of the strongest peaks:
I'll send the .mca later when I have some decent counts.
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