| 长江中下游地区铁、铜等成矿规律研究 |
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| 引用本文：.1992.Metallogenic regularity of iron and copper deposits in the middle and lower valley of the Yangtze River[J].Mineral Deposits,11(1):1~12 |
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| 中文摘要:本文反映了国家重点科技攻关项目75-55-02-01专题的地质研究成果，论文探讨了长江中下游区域成矿的地质背景和构造演化，提出燕山期本区为大陆板块内部的断块与裂陷交织的构造-岩浆-成矿带。燕山早期，以NWW-EW向为主的岩石圈断裂，控制了铜、钼、（金）矿带的分布；燕山晚期，以NNE-NE为主的岩石圈断裂，主要控制了铁及铁-铜矿带的分布。矿带内各矿田的位置，受基底构造和盖层构造的联合控制。根据环形构造、线性构造与侵入岩体的关系，建立了本区矿田构造垂直分带的“三层结构”模式。首次研究了主要赋矿层位--石炭系、二叠系、三叠系地球化学，包括有机碳含量及与金属成矿的关系。对中生代侵入岩的岩石化学和含矿性进行了系统研究，划分了3个成岩成矿亚系列。在综合研究区域构造、沉积、岩浆、成矿等作用演化的基础上，提出本区存在两个成矿系列，即沉积成矿系列(古生代为主)和岩浆成矿系列（燕山期为主），后者是本区主要的金属成矿系列。两个系列的叠加复合是本区区域成矿的一个特色，是造成矿床多样性和复合性的重要原因。论文讨论了铁矿带和铜矿带的区域分布及二者的相互关联，并论述了长江中下游成矿带在环太平洋矿带中的地位和特色。 |
| 中文关键词:铁矿 铜矿 燕山期 成矿系列 成矿规律 长江中下游 |
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| Metallogenic regularity of iron and copper deposits in the middle and lower valley of the Yangtze River |
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| Abstract:The middle and lower valley of the Yangtze River, an important part of the Circum-Pacific metallogenic belt, lies between the North China plate and the Yangtze plate. In Paleozoic, this region was all epicontinental sea in which alternating beds of carbonate rocks and siliceous clastic rocks precipitated together with some syngenetic bedded iron, copper and sulfur deposits. During the late Mesozoic Yanshanian movement, magmatic activity reached its culmination in this region, being mainly intermediate-acid rocks associated with different types of ore deposits. In early Yanshanian period(170-135 Ma), following compressional folding, granitic magma intruded and formed skarn type and porphyry type copper, molybdenum and gold deposits. Both granitites and ore deposits are distributed along NWW-EW trending deep faults. In late Yanshanian period (135-90 Ma), this region transformed into a fault block framework like an immature rift, whose major axis trended NNE-NE. Along this fault zone there intruded andesitic magma which formed diorite-andesite association accompanied by the formation of skarn type iron, copper and sulfur deposits(such as the Daye-Lingxiang iron metallogenic subbelt) and volcanic-hydrothermal type iron and sulfur deposits including ore magma injection type ore bodies(such as Nanjing-Wuhu iron metallogenic subbelt). On the basis of an integrated study of structures, sedimentation, magmatism and metallogenesis in this region, two metallogenic series have been established, i. e. Paleozoic sedimentary metallogenic series and Mesozoic-magmatic-hydrothermal metallogenic series, with the latter series having more important economic significance. The superimposition of these two metallogenic series leads to the extensive distribution of composite type ore deposits such as stratabottnd-skarn deposits, and this constitutes an outstanding feature for the Middle-Lower Yangtze metallogenic belt. |
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