ELECTRON PROBE MICROANALYSIS OF PYROPE FOR NICKEL TRACES AS APPLIED TO STUDY OF THE GEOTHERMOMETRY OF PERIDOTITES
Yu.G. Lavrent'ev, V.N. Korolyuk, L.V. Usova, and A.M. Logvinova
Institute of Geology and Mineralogy, Siberian Branch of the RAS,
3 prosp. Akad. Koptyuga, Novosibirsk, 630090, Russia
Keywords: Geothermometry, electron probe microanalysis, peridotites, pyropes
Pages: 1075-1078
Subsection: PETROLOGY, GEOCHEMISTRY AND MINERALOGY
Abstract
Nickel-pyrope geothermometer, based on proton microprobe determination of Ni contents in pyropes, has been reproduced by applying electron probe microanalysis (EPMA). The measurements were made on a JEOL JXA-8100 microprobe. The detection limit of 6ppm was reached, which is nearly a record value for EPMA. Precision standard deviation is 3ppm. The accuracy of determination, estimated as the difference between the data obtained by the PIXE and EPMA methods, is 9 ppm, which corresponds to a temperature standard deviation of about 50
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