| 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： | 刘文均.湘中地区的泥盆系基底断裂、岩相和层控矿床[J].矿床地质,1986,5(3):7-18. |
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| 作者姓名： | 刘文均 |
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| 作者单位： | 湖南地质科学研究所 |
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| 摘 要： | 湖南中部地区,泥盆系发育良好,岩相变化显著,蕴藏有丰富的层控铅锌矿、黄铁矿矿床,著名的具有层控矿床特征的锡矿山锑矿床也出现于该层位中。本文试图在讨论本区加里东期构造背景、泥盆系岩相变化及层控矿床特点的基础上,说明基底断裂、岩相和层控矿床之间的联系。这种关系在国内外其它层位的层控矿床中,也是具有普遍意义的。在我国,除湘中地区外,湘西、桂北、黔西、秦岭等地的许多层控矿床,均与基底断裂控制的不同岩相带有关。在国外,H.Skall(1975)曾详细论证了北东东向深大断裂与著名的加拿大派因帕因特铅锌矿床的岩相和矿化作用的关系。M.J.Russell(1968)也指出爱尔兰石炭系中的层控贱金属矿床受该区南北向的加里东断裂的控制。
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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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