ELECTRON PROBE MICROANALYSIS OF Cr-SPINEL FOR ZINC AND NICKEL TRACES AS APPLIED TO STUDY OF THE GEOTHERMOMETRY OF PERIDOTITES
Yu.G. Lavrent'ev, L.V. Usova, V.N. Korolyuk, and A.M. Logvinova
United Institute of Geology, Geophysics, and Mineralogy, Siberian Branch of the RAS,
3 prosp. Akad. Koptyuga, Novosibirsk, 630090, Russia
Keywords: Geothermometry, electron probe microanalysis, peridotites, Cr-spinel
Pages: 725-730
Subsection: PETROLOGY, GEOCHEMISTRY AND MINERALOGY
Abstract
Spinel geothermometer, based on proton microprobe determination of Zn content (and in qualitative analysis, Ni content as well), was reproduced by applying electron microprobing. The analyses were carried out on Camebax Micro and JXA-8100 microprobes. The accuracy of determination, estimated as the difference between the data obtained by proton and electron microprobing, was 0.004-0.005%, and the repeatability standard deviation estimated from replicate measurements is ca. 0.003%. The temperature standard deviation was 20-30
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