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Electron Microprobe Lab, University of Minnesota

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I have some 11 year old probe data. Seven grains were analyzed (4 spots
each) and the results ranged from 170 to 190 ppm CoO. I suspect that Co
metal was used as a standard. I doubt that I can find the operating
conditions.




John A. R. Stirling
Geological Survey of Canada
Mineralogy Section
601 Booth Street, Room 761
Ottawa,
Ontario
CANADA
K1A 0E8
Ph 613-943-0270

-----Original Message-----
From: JEOL-Focused Probe Users List [mailto:[log in to unmask]] On
Behalf Of Ellery Frahm
Sent: May 25, 2010 20:18
To: [log in to unmask]
Subject: [PROBE-USERS] Co in olivines

JEOL Probe Users Listserver

Moderator: Ellery Frahm, [log in to unmask], Electron Microprobe Lab,
University of Minnesota

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Probe folks,

Does anyone know of published (or even unpublished) values for cobalt in
San Carlos, AZ olivine?  How about Harrat al Kishb, Saudi Arabia
forsterite?  Both concentrations should be in low three-digit ppm range.
I'd like to know because I'm trying to check our accuracy at measuring
Co in olivine at such a level.

Thanks,
Ellery

-----------------
Ellery Frahm
Senior Research Fellow, Department of Geology & Geophysics Manager &
Principal Analyst, Electron Microprobe Lab Doctoral Candidate,
Department of Anthropology University of Minnesota - Twin Cities campus
Lab website: http://probelab.geo.umn.edu/
Personal: http://web.mac.com/elleryfrahm/