雄村斑岩型铜(金)矿床成矿元素原子比值分析

通过对西藏雄村斑岩铜(金)矿床成矿元素含量的分析，结果表明Au的含量相对较高，铜矿石中Cu、Au原子比值低于25 000，Au、Mo原子比值高于30，表明其为富金斑岩铜矿床。雄村斑岩铜(金)矿床Cu与Au、Ag的关系比较密切，Au与Mo之间则基本没有关系。矿体主要分布在强烈的绢云母和硅化蚀变带中，Au、Ag 主要赋存于黄铜矿中。雄村斑岩型铜(金)矿床成矿深度较浅，而富金斑岩矿床的一般成矿深度为0.4~1.5 km，雄村铜(金)矿床中Mo主要赋存于辉钼矿中，Mo元素多集中在矿体的边缘，含量较低，仅为驱龙斑岩铜矿的1/10。雄村斑岩型铜(金)矿床的形成环境为岛弧或似岛弧环境。

Analysis on the Atomic Ratios of Ore-forming Elements in Xiongcun Porphyry Cu-Au Deposit

The analysis on the ore-forming contents of Xiongcun porphyry copper deposits in Tibet showed that Gold content are relatively high.The copper ores exhibit Cu/Au atomic ratios much smaller than 25 000，Au/Mo atomic ratios greater than 30，which signify them as gold-rich porphyry copper deposits.There is a close correlation between Au，Cu and Ag in Xiongcun porphyry Cu-Au deposits，but poor correlation between Au and Mo.The ore-body is widespread in the phyllic and siliconization alterations zone，and Au and Ag mainly occur in chalcopyrite.Xiongcun porphyry mineralization is generally low in depth，and gold-rich porphyry copper deposits tend to be emplaced at levels of 0.4~1.5 km.Mo in Xiongcun copper（gold) deposit mainly occur in molybdenite and more concentrated in the edge of the ore body with a lower content of only one-tenth of Qulong porphyry copper deposit.Xiongcun porphyry deposits are formed in an environment of island arc or similar island arc.