有机质的热液成熟作用在云南金顶铅锌矿床形成过程中的意义

HYDROTHERMAL MATURATION OF INDIGENOUS ORGANIC MATTERS AND THEIR SIGNIFICANCE IN THE METALLOGE-NIC PROCESSES OF THE JINDING LEAD-ZINC DEPOSIT,YUNNAN PROVINCE

云南金顶铅锌矿床中含有大量有机质,按其赋存状态可划分为3种类型:(1)原生型:(2)热液变质型;(3)迁移型.有机地球化学研究指出:主岩中的原生有机质处于有机质未成熟阶段或低级成熟阶段。含矿热液的作用使原生有机质发生热裂解,出现热成熟异常。含矿热液作用的结果,消耗了部分有机质,并生成大量硫化氢,导致金属硫化物沉淀富集。研究有机质的热成熟异常分布规律,有助于寻找金顶式铅锌矿床。

There are a lot of organic matters in the Jinding lead-zinc deposit. The organic matters can be distingushed as three types by their occurrence, a) the indigenous type, b) the type of hydrothermal metamorphism.c) the type of migration. The studies of organic geochemistry demonstrate that the indigenous organic matters in the host rock are in immature stage or low-grade mature stage. The thermal degradation of the indigenous organic matters resulted from ore-bearing hydrother-matism, then the anomaly of hydrothermal maturation is formed. As a result of the reaction of the ore-bearing hydrothermal fluid a lot of hydrogen sulfides are produced by partial organic matters.This process generates precipitation and enrichment of the metallic sulfides. Studies on the distributive form of thermal mature anomaly of the organic matters are a great help to research and exploration of the Jinding-type lead-zinc deposit.