摘要
运用大陆动力学与构造成矿学的最新理论，在野外地质观察与综合分析测试基础上，初步确定了湘东及邻区北西向构造岩浆带是与华南古裂谷近相垂直而发育起来的板内转换断裂，也是中国东南部斜穿南岭的又一条重要铀多金属成矿带；整体活动始于中生代的北北东向走滑构造岩浆带深切华南主要板内构造单元，并经历了燕山早期会聚走滑与燕山晚期离散走滑造山作用，形成走滑重熔花岗岩及一系列平移断层、拉分盆地和铀多金属成矿作用。以典型矿床为例，探讨了走滑断裂运动学、动力学特征及其对铀成矿作用的控制。
East Hunan and its adjacent area are defined as an intraplate orogenic zone with the helpof new theory of geology and multi-discipline reserach. The evolutionary stages, deep structure, geological feature, rotation strain and metallogeny of NW-striking transfer fault zoneare discussed. NE-trending strike-slip fault zone, as a whole, entered action during the Pacific movement and underwent 3 stages: strike-slip shearing, pull-apart extension and compressive thrusting. The macro- and microscopic features of strike-slip fault and its controlling factors for uranium mineralization in Jinguanchang deposit are studied by means of modern structure analysis, micro-submicroscopic investigation and geophysical measurement.The narrow stretching belt of magnetotelluric sounding low value belongs to upper mantle partial structural softening belt, which extends to the base of lithosphere and in whichlateral flow of crust-mantle material is advantageous for the reason of violent change ofcrustal thickness. The thickening of widespread Hercynian-Indo-Sino carbonate strata indicates that there has been a sedimentary center concerned with long-term active NW-directiontransform fault since Caledonian epoch. The uranium deposits are often located at the partialdoming edge of the depression. NW-direction transform fault and NE-direction strike-slipfault not only provide transporting passages for the exchange of crust-mantle, but also arethe precondition to bring out the development and location of polyphase uranium-bearinggranite. Cover host strata concerned with exocontact belt and host structure produced bystretching and strike-slip arc advantage place for collecting ore.
出处
《大地构造与成矿学》
EI
CAS
CSCD
1998年第S1期38-42,共5页
Geotectonica et Metallogenia
