Geochemical Characteristics of Tianmashan Au-S Deposit in Tongling, Anhui Province, China

摘要

The Tianmashan Au-S deposit is geochemically characterized by a vertical variation and a two-layer texture as well as the development of the upper stratiform ore bodies and the lower net-stockwork ores. Pb, Zn, Au, Ag, As, Hg contents and average δ~(18)O values increase progressively whereas Cu, Mo, Cr, Co, Ni, REE contents and δ~(34)S decrease gradually from the lower net-stockwork ores to the upper stratiform ores. δ~(34)S values of pyrite range from +4.0%o to +9.6%o. The average δ~(18)O value of calcite and quartz in the upper stratiform ores is +13.7%o, while that of quartz and whole rock in the lower net-stockwork ores is + 12.3%o. These geochemical characteristics suggest that the Tianmashan Au-S deposit is of the submarine sedimentary exhalative origin.