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江西浒坑钨矿含矿石英脉的地质特征及成矿构造演化
投稿时间:2008-07-31  修订日期:2008-07-31  点此下载全文
引用本文:章伟.2008.江西浒坑钨矿含矿石英脉的地质特征及成矿构造演化[J].地质学报,82(11):1531-1539.
zhangwei.2008.The Geological Features and Evolution of Metallogenic Tectonics of the Ore Bearing Quartz Veins at Hukeng Tungsten Deposit , Jiangxi Province[J].Acta Geologica Sinica,82(11):1531-1539.
DOI:
摘要点击次数: 1974
全文下载次数: 2434
作者单位E-mail
章伟 中国地质大学(北京) zhangwei-china@live.cn 
基金项目:国家重点基础研究发展计划(973计划),国家自然科学基金项目(面上项目,重点项目,重大项目),中国地质调查局项目
中文摘要: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含矿块状石英脉在形成后遭受不同程度的韧性剪切,从而形成不同成分的分异条带。剪切带以出现新生的面理和线理(拉伸线理)为特征。岩石学研究表明条带状矿石属于糜棱岩,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和矿石类型。建立了原生节理形成→石英充填→韧性剪切发生→二期石英充填→脆性碎裂的矿区构造演化序列。韧性剪切作用的动力学背景可能是受后期岩浆侵入的影响,最后的脆性破裂应与区域上存在南北向的压应力有关。
中文关键词:浒坑钨矿  条带状石英脉  糜棱岩  韧性剪切带  构造演化
 
The Geological Features and Evolution of Metallogenic Tectonics of the Ore Bearing Quartz Veins at Hukeng Tungsten Deposit , Jiangxi Province
Author NameAffiliationE-mail
zhangwei  zhangwei-china@live.cn 
Abstract:Hukeng tungsten deposit is a large scale tungsten deposit which locates at the Wugong Mountain in the west of Jiangxi Province. Ore bearing quartz veins are mainly at the inner contact zone of the rock body which are different from the topical five-layer model in the southern Jiangxi Province. Massive structure and banded structure appear widely in the ore bearing quartz veins. After detailed field work and microscope observation, we find out that the ore bearing massive quartz veins underwent ductile shear at different degree after they were formed, thus formed differentiated bands which have different components. There are neoformative foliation and lineation(stretching lineation) in the shear zone. The petrological study shows that banded ore belongs to mylonite, which has abundant microstructure feature of plastic deformation. Structural analysis reveals 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, thereby formed 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 at second stage →formation of brittle fracture. The geodynamic setting of the ductile shear may be the later Magma Intrusion and the brittle fracture is related to the NS-trending stress field in this area.
keywords:Hukeng tungsten deposit  banded quartz vein  mylonite  ductile shear zone  tectonic evolution
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