兰坪思茅盆地第三纪矿床有机质特征及其地质意义  

CHARACTERISTICS AND GEOLOGICAL SIGNIFICANCE OF ORGANIC MATTER CONTAINED IN TERTIARY ORE DEPOSITS IN LANPING SIMAO BASIN, WEST YUNNAN

作　　者：陈广浩[1] 尹汉辉[1] 楚颖[1] 刘德汉[2] 

机构地区：[1]中国科学院长沙大地构造研究所 [2]中国科学院广州地球化学研究所

出　　处：《矿床地质》1996年第4期374-380,共7页Mineral Deposits

基　　金：中国科学院广州地球化学研究所有机地球化学国家重点实验室资助课题

摘　　要：兰坪思茅盆地第三纪矿床富含有机质，有机地球化学研究认为，矿床中的有机质处于未成熟阶段或低级成熟阶段，其分布受中轴断裂带的控制，有机质为海相、陆相的有机沉积物，生物标志显示盆地第三纪成矿为裂谷构造环境。沿中轴断裂产生的含矿热液使有机质发生热裂解，在此过程中大部分有机质消耗形成还原条件，产生大量的Ｈ２Ｓ，导致金属硫化物的沉淀富集；部分有机质的吸附作用，与硫酸盐、氯化物一起沉积，形成盐矿，晚第三纪成矿温度的下降，生物的还原作用，形成油气、煤。The Tertiary ore deposits in Lanping Simao basin are rich in organic matter Studies on organic geochemistry have yielded the following understanding: Organic matter contained in the deposits are in an immature state or in a low developmental stage; the distribution of organic matter comprising organic sediments of marine or continental facies is controlled by intermediate axis fault; the biomarker shows that the Tertiary metallization in the basin took place in a rift tectonic setting The ore bearing hydrothermal solution produced along the intermediate axis faults caused the pyrolysis of the organic matter; the organic matter was mostly consumed to form a reduction condition with the generation of abundant H 2S as well as the enrichment and deposition of metallic sulfides A part of organic matter deposited together with sulfates and chlorides as a result of the absorption by terreaus The drop of ore foming temperature and the reduction of biota led to the formation of gas and coal in Late Tertiary

关 键 词：有机质 形成环境 成矿作用 矿床 成矿温度 

分 类 号：P611[天文地球—矿床学]