Other
Scientific paper
Jun 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57.2481c&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 57, Issue 11, pp.2481-2486
Other
5
Scientific paper
197 Au Mössbauer spectra were measured for crystalline Au 2 S and for gold adsorbed onto colloidal As 2 S 3 and Sb 2 S 3 substrates. The spectrum for Au 2 S is characterised by a quadrupole split doublet which has been deconvoluted into two overlapping doublets. The spectra for adsorbed gold on colloidal As 2 S 3 and Sb 2 S 3 are similar in appearance to that of Au 2 S and have isomer shifts (IS) and quadrupole splitting (QS) values which are characteristic of gold in the +1 oxidation state, coordinated to two sulphur electron donors in an approximately linear geometry. The 197 Au Mössbauer data confirm that the gold occurs on the As 2 S 3 and Sb 2 S 3 substrates as a surface complex and has not been electrochemically reduced to elemental gold (Au 0 ). These data further emphasize the role of surface chemistry in the scavenging and concentrating of gold by sulphide mineral surfaces from hydrothermal fluids in high-temperature ore-forming systems (e.g., epithermal environments), as well as in seafloor hydrothermal systems, where sulphide minerals are precipitating near the seafloor-seawater interface.
Cardile C. M.
Cashion J. D.
McGrath A. C.
Renders P.
Seward Terry M.
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