Organic Geochemistry of the Bijiashan Lead-Zinc Deposits(Ⅰ):Features of the Soluble Organic Matter and Discussion on Several Genetic Problems of Ore Deposits
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摘要: 本文对毕家山铅锌矿床和围岩中可溶有机质进行了分析，研究了矿床中有机质的性质、来源和成熟度，进而探讨了矿床中有机质的原始运移形式、成矿溶液可能的成因以及矿床形成的环境。结果表明，矿床中有机质主要属水生生物和细菌成因，它起源于灰岩矿源层，其原始运移形式可能为腐殖酸；成矿溶液可能形成于成岩早期，来自灰岩矿源层；矿床形成于强还原环境。这些无疑对矿床成因的了解具有重要意义。Abstract: This paper has studied the nature, source and maturity of organic matter in the Bijiashan lead-zinc deposits by analysis of extractable organic matter in the ores and adjacent rocks.The probably primary migration form of organic matter, probable genesis of ore-forming fluids and ore-forming environment are discussed. The fractions of chloroform extracts and distributional features of biomarkers reflect that organic matter is mainly composed of aquatic organism and bacteria and comes from the ore source bed of carbonate rocks. Based on analysis of the data of geology and geochemistry of the ore deposits, it is believed that the primary migration form of organic matter in the ore deposits probably is humic acid, and that the ore fluids probably are derived from diagenetic solutions in carbonate rocks. Low ratios of Pr/Ph and existence of βcarotane indicate that the ore deposits are formed under a strongly reducing environment.Those results are important in understanding genesis of the ore deposits.
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