| 兰坪思茅盆地第三纪矿床有机质特征及其地质意义 |
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| 引用本文：.1996.Characteristics and geological significance of organic matter contained in tertiary ore deposits in Lanping-Simao basin, west Yunnan[J].Mineral Deposits,15(4):373~380 |
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| 基金项目: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（OGL-9021） |
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| 中文摘要: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。 |
| 中文关键词:有机质 形成环境 成矿作用 兰坪思茅盆地 |
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| Characteristics and geological significance of organic matter contained in tertiary ore deposits in Lanping-Simao basin, west Yunnan |
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| Abstract: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 H2S 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-forming temperature and the reduction of biota led to the formation of gas and coal in Late Tertiary. |
| keywords:organic matter, formation environment, metallization, Lanping-Simao basin |
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