桂西金牙微细浸染型金矿床同位素地球化学研究

ISOTOPE GEOCHEMISTRY OF JINYA DISSEMINATED GOLD GEPOSIT IN WESTERN GUANGXI

本文对桂西金牙微细浸染型金矿床作了氢、氧、碳、硫、铅和锶同位素地球化学研究。获得该矿床早期成矿热液源于同生热卤水，而晚期成矿热液则是由下渗雨水与封存的油田卤水混合形成混合热液的同位素证据。成矿热液中的硫主要源自赋矿地层中三叠统百蓬组。获得两组同位素年龄，其中２０６±１２Ｍａ属印支末期，是金矿床早期同生热卤水成矿年龄。１３０－８２Ｍａ为燕山期，代表金矿床晚期混合热液成矿的年龄。

This paper researches into the isotope geochemistry for H,O,C,S,Pb and Rb-Sr ofJinya disseminated gold deposit in western Guangxi.The isotope evidence indicates that the hy-drothermal fluid of the early stage was connate brine in origin and that of the later stage was theproduct of sedimentary origin and mainly derived from Baipeng Formation(T_2 z).Two data of iso-topic ages are obtained.One is 206±12 Ma,belonging to the age of the early hydrothermal stageand the other is 130-62 Ma,belonging to that of the late one