浅谈湘南地区北西向构造及其控岩控矿作用

本文根据野外调查和区调资料,结合物化探及遥感解译成果的综合分析,认为湘南地区北西向构造广泛发育。按生成时期、发育特点及分布情况可大致划为:安仁—桂东、耒阳—汝城、常宁—桂阳、新田—临武四个构造带。具有长期活动、成带出现、大致等距,控岩控矿的特征。北西向与北东向构造带交会部位往往是矿田的赋存部位或寻找隐伏矿田最有利的地段。

AN ELEMENTARY INTRODUCTION TO THE NW TREND STRUCTURES IN SOUTHERN HUNAN AND THEIR PETROGENIC AND METALLOGENIC CONTROL

The NW trend structures developed extensively in southern Hunan. Its manifestation varies as time and space changes. In Caledonian cycle, NW trend folds and compressive faults developed and associated with magmatic activities; in Hercynian-Indo-sinian cycle, its manifestation form was NW trend paleo-down-warping zone; and from lndo-sinian to Yanshanian period, apart from some survived NW trend folds in upwarping region, NW trend compressive and compresso-shear faults appeared in groups. There is also obvius showings in remote sensing images and geophysical exploration data. According to their history of formation, the characteristics of development and distribution, it can be roughly classified into four structural zones as Anren-Guidong, Leiyang-Rucheng, Changning-Guiyang and Xintian-Lingwu NW trend structural zones. They are characterized by their long history of activity, zonal occurrences, equal-distance distribution and controlling the mineralization and the intrusion of magma. The intersecting positions of NW trend structures with NE trend ones are always where the orefields are located or the most favourable places for concealed orefields.