Study On Basement Characteristics And Its Ore-controlling Effect In Lower Yangtze Region

With the rapid development of national economy, due to the high degree and a long time of exploitation many of our mines became into crisis mine, so deep exploration of mines is important and necessity. Middle and lower reaches of Yangtze River region (ie in the Lower Yangtze region) metallogenic belt as one part of the circum-Pacific metallogenic belts, part of the focus areas to carry out deep prospecting. This paper relies on the "Yangtze basement structure and lead ore-Ore Elements Project", designed to study three-dimensional basement structure and guide the district mining and ore-controlling structure rules, proposed deep prospecting targets for the Yangtze River Fe-Cu deposits breakthrough in deep exploration of theories and methods to provide support to better serve the national economy.Based on full collection and comprehensive study of previous data, relying on the actual project and research, this thesis first by the geological characteristics of the Lower Yangtze region start, summed up the formation, structure, the basic characteristics of igneous rocks, summarized the regional tectonic evolution history; Secondly, through comprehensive research analysis and project outcomes, the Lower Yangtze region metamorphic base structure,called the Archaean to the Early Proterozoic metamorphic basement (Ar-Pt1) crystalline basement, called the middle and late Proterozoic metamorphic basement (Pt2-Pt3)folding basement; and through research that the Xingzi complex mixed with the overlying Proterozoic Jiangnan uplift Shuangqiaoshan Group has been constituted with effect from double-layer substrate, it will be the Xingzi complex to be complex Jiangnan uplift attributable to the basement area from the crystalline basement (southern type), not part of the Huangling-basal area with the County (ie, Kong Mountain Ridge-Dong Ling terrane, Jiangbei type); on the Lower Yangtze metallogenic belt and its adjacent areas to the basement of re-drawing, is divided into eight major areas:North china-North Qinling granulite facies-amphibolite facies-greenschist facies metamorphic basement area, Dabie amphibolite-granulite facies metamorphic basement area, Huangling-With the county green schist-amphibolite facies metamorphic basement area, Kong Mountain Ridge-Dong Lingji bottom area (Jiangbei type), basal area of Jiangnan (southern type), JiuLing green schist basement area, Huai Yushan District slate green schist basement and Zhangbaling terrane.On the south base and the representation of Jiangbei basal rocks, that the Xingzi complex groups and Dong Ling rock group the information by summarizing previous studies and tests conducted geochemical analysis, that the Xingzi complex should be a rock group's original basic volcanic rock, Dong Ling Yan The original rock group is basic-acidic volcanic rocks, pyroclastic rocks, siltstone, and so on; the Xingzi rock group and Dong Ling rock REE and trace element characteristics of groups with significant differences, indicating that the two different metamorphic crystallization of the product; the Xingzi rock group and tectonic setting is the expansion of arc-arc or inter-basin, volcanic arc basalt.By the research of the belt and the deposit base in control of the spatial distribution of fluctuations in the basement compared with the ore field has a significant correspondence between diagenesis and regional substrate material forming the source material has an important contribution to the role, basement structure has important control phase, control mineralization.