铜陵地区的镶嵌构造及其控矿意义

铜陵地区是我国著名的铁铜矿区。海西—印支期,环太平洋波浪引起了北东向展布的褶皱群,其背斜是波峰带,向斜是波谷带。印支期,古地中海地壳波浪使本区形成了北西向断裂。北东向构造和北西向构造的交织,形成了区内镶嵌构造格局。北西向断裂控制着铜铁矿床的分布,铅锌矿床则沿北东向的背斜翼部分布,构造的等间距性决定着矿田分布的等间距性。

THE WAVE-MOSAIC STRUCTURE OF THE EARTH'S CRUST IN TONGLING DISTRICT AND ITS CONTROL OF CERTAIN ORE DEPOSITS

During the Hercynian-lndochina cycle,the circum-Pacific crust-wave mainly created anticlines and synclines in north-east direction,later during the Yanshan orogeny the paleomediterranean crust-wave produced so-called 'semih-orst-semigraben' structures in north-west direction in this region.The regional structural framework in Tongling district is created by the intersection of these two structural belts. The formation of Cu, Fe, Pb, and Zn deposits in this district is controlled by the structural framework. Deposits of copper and iron extend in north-west direction, forming two zones,while lead and zinc deposits extend in north-east direction, and the major deposits are all located in the places where the NW fracture zones and the NE wave crest zones intersected each other.The distribution of the deposits of the same type is of characteristic of subequal spacing and this is a consequence of the equal spacing of the stra-ctural zones.