Hello, im a Msc student from Portugal. Im currently studying cores containing Au-As and i came across a article (Choi, 2004; Systematic mineralogy and chemistry of gold-silver vein deposits in the Taebaeksan district, Korea: Distal relatives of a porphyry system) refering a electrum-sphalerite geothermometer. Since i have both minerals and i consider them to be in equilibrium, i thought i could try to use it and compare with the arsenopyrite geothermometer temperatures. However, i cannot find much information regarding this geothermometer, only the two citations from that article, in which i don't have access to one of them (the Barton, P.B., Jr. and Skinner, B.J. (1979) Sulphide mineral stabilities. Pp. 278-403 in: Geochemistry of Hydrothermal Ore Deposits, 2nd edition (H.L. Barnes, editor). Wiley-Interscience, New York), and the other doesn't explain how i could use the geothermometer.

Does anyone knows how can i use it from EPMA data? Is there any formula?

Thanks!