Alteration and mineralization styles of the orogenic disseminated Zhenyuan gold deposit, southeastern Tibet: Contrast with carlin gold deposit

摘要: Abstract Orogenic disseminated and Carlin gold deposits share much similarity in alteration mineralization. The orogenic Zhenyuan Au deposit along the Ailaoshan shear zone, southeastern Tibet, was selected to clarify their difference. mineralization from different lithologies, including meta-quartz sandstone, carbonaceous slate, meta-(ultra)mafic rock, quartz porphyry lamprophyre were researched. According mineral assemblage replacement relationship all types of host rocks, two reactions show general control on deposition: (1) earlier magnetite by pyrite material; (2) biotite phlogopite phenocrysts into dolomite/ankerite sericite. Despite is volumetrically minor less fractured than other it contains a large portion reserve, indicating that chemically active lithology has played more important role precipitation compared structure. LA-ICP-MS analysis shows mainly occurs as invisible fine-grained with content reaching 258.95 ppm. The diagenetic core sandstone enriched Co, Ni, Mo, Ag Hg wrapped hydrothermal Cu, As, Sb, Au, Tl, Pb Bi. Different rock impact features. Carbonate sericite altered they have higher Mg those developed rocks denoting carbonate incorporated primary during alteration. ore fluid activated diagenetic leading Ag, Te, Hg, Bi, but Co Ni contain high Ni. However, As similar range both these elements most likely come deep source rather rocks. It shown (mainly dolomite ankerite), sericite, arsenopyrite develops This Nevada type, which dissolution silicification rock. On hand, occur deposits.