| 湘中地区的泥盆系基底断裂、岩相和层控矿床 |
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| 引用本文：.1986.Fundamental Fractures,Lithofacies And Stratabound Ore Deposits In Devonian System Of Central Hunan Liu Wenjun[J].Mineral Deposits,5(3):7~18 |
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| Fundamental Fractures,Lithofacies And Stratabound Ore Deposits In Devonian System Of Central Hunan Liu Wenjun |
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| Abstract:The spatial correlation between the fundamental fractures, lithofacies and the stratabound ore deposits is illustrated in this paper, with special reference to the stratabound ore deposits in Devonian System of Central Hunan. Following the Caledonian orogeny, a group of NE-trending great fractures occurred in this region (Fig.l), which are characterized by prolonged inheritance of activities. Durmg Middle Devonian Qiziqiao time, their synsedimentary expansion influenced, and governed the paleogeographical landscape of sedimentary facies; as a result, there appeared NE-trending linear basins of moderate depth (troughs) along the fracture line in the shallow-water carbonate platform with bioherms distributed discontinously on its margin. The Devonian stratabound Pb-Zn deposits and pyrite deposits of the area both occur in the reef limestone or dolomitite at the margin of the carbonate platform of Qiziqiao time (Fig.6), and are also controlled by the NE-trending great fracture and its secondary structures (Fig.5 and 7).1nvestigation shows that these ore deposits were formed in Yanshanian period with the metallogenic materials derived from the Devonian and the underlying pre-Devonian strata. The ore-forming fluids probably moved along the fracture zone and were then concentrated in favourabk lithological environment. Thus a conclusion is reached that the fundamental fractures controlled the lithofacies at their early-stage activities and the mineralization at late stage. Fundamental fractures and lithofacies seem to be closely related to stratabound ore deposits in space as a trinity. |
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