Does anyone has experience dating scheelite from hydrothermal gold deposit using the following two isotopic systems (U-Pb by LA-ICP-MS and Sm-Nd by TIMS)? Any advice concerning the settings to use with the laser (using the NIST 612 glass standard as a primary standard) and the dissolution technics for the TIMS?
Thank you very much,
Pierre-Arthur
Yes, my coauthors, Niki Wintzer (USGS) and Mark Schmitz (Boise State University) have dated hydrothermal scheelite using LA-ICPMS in U-Pb system as well as with ID-TIMS. Material is from Stibnite District, Idaho. We are writing a manuscript (in revisions) for Economic Geology. Also see abstract (Wintzer et al) from GSA meetings in 2016, 2017. However, as a quick word of caution, the LA analyses using glass standard proved to be not as accurate as results from TIMS (U-Pb). A correction factor was calculated to enable better precision from remaining samples with LA. Mark Schmitz developed the analytical chemistry and supervised the ID-TIMS work. Full details will be in forthcoming article. Also in recent dissertation (Washington State Univ.) by Wintzer.
Hi Virginia,
thank you very much for your answer. I will have a look at your work.
Best regards,
Pierre-Arthur
I recently read an intesresting paper that hopefully may help you:
Article Nd and Sr isotope study of hydrothermal scheelite and host r...
Good luck!
Hi Daniel,
thank you very much for sharing. I'm gonna have a look at it. I'm currently doing the CL images of the scheelite grains, next step will be analyzing the trace elements with the laser and measuring the U-Pb isotopes for U-Pb dating before starting the dissolution process. Will keep you in touch.
Cheers,
Pierre-Arthur
Hi Pierre-Arthur,
U-Pb of scheelite has been also been done at the Université de Rennes (see paper: Article The polyphase evolution of a late Variscan W/Au deposit (Sal...
.The obviously problem is the high common Pb so high precision ages are unlikely.
Patrick
Hi Pierre-Arthur,
I have been following this discussion and I wanted to share a recent publication from Palmer et al. (2021) Article In-situ scheelite LASS-ICPMS reconnaissance Sm Nd isotope ch...
The analyses were done at the University of Alberta. If you have analytical questions, you might want to contact Yan Luo and/or D.Graham Pearson about this specific study.Cheers,
Hi Hélène, Patrick,
thank you very much for your answers. I will read these papers carefully.
Best regards,
Pierre-Arthur
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