Duan Yi, Xu Yanqian, Ma Lanhua, Shen Xiuyun. Organic Geochemistry of the Bijiashan Lead-Zinc Deposits(Ⅰ):Features of the Soluble Organic Matter and Discussion on Several Genetic Problems of Ore Deposits[J]. Acta Sedimentologica Sinica, 1996, 14(S1): 198-205.
| Citation:
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Duan Yi, Xu Yanqian, Ma Lanhua, Shen Xiuyun. Organic Geochemistry of the Bijiashan Lead-Zinc Deposits(Ⅰ):Features of the Soluble Organic Matter and Discussion on Several Genetic Problems of Ore Deposits[J]. Acta Sedimentologica Sinica, 1996, 14(S1): 198-205.
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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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1 Lanzhou Institute of Geology, Academia Sinica, Lanzhou 730000;
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2 Research Institute of Petroleum and Development of Changqing oilfield, Gansu Qingyang 745101;
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3 Earthquake RESEARCH Institute of Lanzhou, SSB China, Lanzhou 730000
- Received Date: 1995-08-01
- Publish Date:
1996-12-31
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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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