江西浒坑钨矿含矿石英脉的地质特征及成矿构造演化  

The Geological Features of the Ore Bearing Quartz Veins at the Hukeng Tungsten Deposit,Jiangxi Province

作　　者：章伟[1] 陈懋弘[1,2] 叶会寿[2] 刘珺[3] 舒巧[1] 

机构地区：[1]中国地质大学,北京100083 [2]中国地质科学院矿产资源研究所,北京100037 [3]安徽建筑工业学院土木工程学院,合肥230022

出　　处：《地质学报》2008年第11期1531-1539,I0001,I0002,共11页Acta Geologica Sinica

基　　金：国家重点基础研究发展计划“973”项目(编号:2007CB411407和2007CB411405);中国地质调查局项目(编号:1212010634001);全国危机矿山接替资源找矿项目(编号200636028);国家自然科学重点基金项目(编号40434011)资助的成果

摘　　要：位于赣西武功山地区的江西浒坑钨矿是一个大型石英脉型钨矿床,与赣南典型的"五层楼"模式不同,矿脉主要集中在岩体内接触带。含矿石英脉除了普通的块状构造以外,还普遍存在条带状构造。详细的野外编录和镜下研究表明条带状石英脉实为韧性剪切带,以出现透入性的新生面理和线理为特征。岩石学研究表明条带状矿石属于石英质糜棱岩,具有丰富的塑性变形显微构造特征。通过对含矿石英脉的构造解析,认为与岩浆岩有关的原生节理系统基本上是同时形成的,沿节理充填的石英脉经历了长期的、多期次的构造运动,从而形成了复杂的石英脉类型。建立了原生节理形成→块状石英充填→韧性剪切发生→二期块状石英充填→脆性碎裂的矿区构造演化序列。韧性剪切的成因机制可能是受第二期岩浆侵入的影响,最后的脆性破裂应与区域上存在南北向的压应力有关。Hukeng tungsten deposit is a large scale tungsten deposit which locates at the Wugong Mountain in the west of Jiangxi Province. Different from the typical five-layer model in southern Jiangxi Province, ore bearing quartz veins are mainly concentrated on the inner contact zone of the rock body. Along with massive structure, banded structure appears widely in the ore bearing quartz veins. Detailed field work and microscope observation suggests that the banded quartz veins are various ductile shearing zones, which are characterized by new penetrative foliation and lineation. The petrological study shows that banded ores belong to mylonite, with abundant microstructure features of plastic deformation. Structural analysis of the ore bearing quartz veins reveal that most primary joints related to magmatic rocks are synchronogenic. The quartz veins which intruded into the joints underwent long-term and multi- tectonic movements, thus forming complicated quartz veins and ore types. The evolution series of structure in the mining area are as follows： formation of the primary joints →filled by the quartz veins →ductile shear →filled by the quartz veins again →formation of brittle fractures. The geodynamic setting of the ductile shear may be affected by the second magma intrusion, while the brittle fracture could be related to the NS-trending stress field in this area.

关 键 词：浒坑钨矿 条带状石英脉 糜棱岩 韧性剪切带 构造演化 

分 类 号：P618.67[天文地球—矿床学]