Elemental analysis of bonanza ores of the Ryosen veins, Hishikari epithermal Au–Ag deposit, Japan, using micro X-ray fluorescence (µ-XRF)

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  • Shimizu Toru
    AIST, Geological Survey of Japan, Institute of Geology and Geoinformation (Present affiliation: Research Institute of Earthquake and Volcano Geology)

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  • 微小部蛍光Ｘ線分析装置(µ-XRF) による菱刈浅熱水性金銀鉱床産ボナンザ鉱石の元素分析

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Micro X-ray fluorescence (µ-XRF) instrumentation (Bruker M4 TORNADO) was used to investigate the elemental distribution in hand specimen and at microscopic scale of the surface of bonanza ores from the Ryosen veins in the Hishikari epithermal Au–Ag deposit. The X-ray mapping results show that the metallic elements (Au, Ag, Cu, Fe, Zn, and Se) and sulfur are correlated. However these elements are negatively correlated with potassium with a spatial resolution of tens of micrometers. Microscopic observations indicate that the following vein minerals correspond to the enrichment of elements in X-ray images: electrum for Au and Ag, naumannite for Ag and Se, chalcopyrite for Cu, Fe, and S, sphalerite for Zn and S, and adularia for K. Combined with the previous studies of reaction path modeling and experiments regarding Au and Ag precipitations from bisulfide complexes in boiling fluids, the negative correlation between Au and K is interpreted as being the result of a kinetic effect on electrum deposition. Electrum precipitates as a result of the concurrent decomposition of the bisulfide complexes Au(HS)2- and Ag(HS)2- after the formation of adularia when the influence of H2S gas loss becomes dominant over that of the initial increase in pH that favors adularia precipitation.

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