| 沉积硫化物矿层形成的构造地球化学机制 |
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| 作者单位： | Wuhan College of Geology，Wuhan 430074 |
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| 摘 要： | 在还原性海底水域中,厌氧细菌引起的还原作用提供了沉淀剂S~（2-）。这种作用控制着同生硫化物相的形成。盆地中古构造运动形成的沉降—堆积弱补偿状态是硫化物矿物富集的一种有利条件。在此情况下,硫化物层不受非矿物质的稀释。某些层控矿床的地质和地球化学资料证明,陆缘构造拗陷带的潮下海湾和泻湖相构成一种使陆源成矿元素聚集成矿床的“地球化学阱”。
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| 关 键 词： | 同生硫化物矿床 化学模型 古构造控制 物源 补给机制 “地球化学阱” |
THE TECTONIC AND GEOCHEMICAL MECHANISM OF THE FORMATION OF SOME SYNGENETIC ORE DEPOSITS |
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| Authors: | Zhao Lunshan Shen Yongli Liu wenhua Zhan weiguo |
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| Abstract: | In the reduced sea-bottom water, the reduction of sulfate caused by anaerobic bacteria, which provide S2- as a precipitator, controls the formation of syngenetic sulfide facies. Insufficient compensation state of the subsidense-deposit balance caused by paleotectonic movement in the basin is a favourable condition for the concentration of sulfide minerals. In this case the sulfide ore layers are not diluted by barrep sediments. Geological and geochemical data from some strata-bound ore deposits demonstrate that the subtidal bay and lagoon facies in the epicontinental depression belt make up a
"geochemical trap" , where ore-forming metallic elements from continents can be concentrated to form ore deposits with no additional sources required. |
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| Keywords: | syngenetic ore deposits chemical model material source controlled by paleostructure supplement mechanism "geochemical trap |
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