摘要
以北东向深大断裂为界,湘东北地区被分割成了一系列由花岗岩、新元古代地层组成的断隆和由白垩系组成的断陷盆地,构成典型的盆岭构造。长沙平江断裂带(长平断裂带)即为这类北东向深大断裂之一,且在断裂中发育有铜、钴、金等多金属矿床(点)。然而,对于长平断裂带的活动期次及其与多金属成矿作用的关系仍然存在着争议。为了解决这个问题,选取了到湾—风水坳地区作为研究区,通过详细的区域及矿区构造填图,认为长平断裂带经历了三期构造演化:第一期发生左行错动,第二期发生大规模拆离断层性质的活动,第三期发生小规模的右行逆断层性质的活动。其中,第二期构造演化与多金属成矿作用有关。
The northeastern Hunan Province consists of a series of mountains and basins bordered by NE-trending regional faults,forming a basin-and-range-like structural pattern.The mountains are usually composed of granitoids and Neoproterozoic formations,while the basins develop Cretaceous sediments.The Changsha-Pingjiang(Abbr.Changping)fault zone is one of these NE-trending faults and contains numerous Cu,Co and Au polymetallic deposits and occurrences.However,the activities of the Changping fault zone and their relationship with metallogeny remain ambiguous.In order to solve these problems,the paper selected the Daowan-Fengshuiao district as research target.Based on systematic structural mapping on regional and mining district scale,at least three phases of tectonism are recognized from the Changping fault zone.During the first stage,the Changping fault zone showed a sinistral strike-slip movement.The following stage was characterized by large-scale detachment of the Changping fault zone.The third stage was linked to a dextral strike-slip with minor reverse component.The polymetal mineralization is interpreted to be associated with the second stage of deformation of the Changping fault zone.
作者
周岳强
许德如
董国军
王智琳
蔡建新
颜志强
李荫中
ZHOU Yue-qiang;XU De-ru;DONG Guo-jun;WANG Zhi-lin;CAI Jian-xin;YAN Zhi-qiang;LI Yin-zhong(402 Brigade of Hunan Geology and Mineral Exploration Bureau,Changsha 410014,China;State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,China;School of Geoscience and Info-Physics,Central South University,Changsha 410083,China;Key Laboratory of Ocean and Marginal Sea Geology,South China Sea Institute of Oceanology,Chinese Academy of Sciences,Guangzhou 510301,China)
出处
《东华理工大学学报（自然科学版）》
CAS
2019年第3期201-208,共8页
Journal of East China University of Technology(Natural Science)
基金
国家自然科学基金项目(41672077)
国家重点研发计划“深地资源勘查开采”重点专项(2016YFC0600401)
关键词
井冲钴铜多金属矿床
长平断裂带
拆离断层
盆岭构造
湘东北
江南造山带
华南
Jingchong Co-Cu polymetallic deposit
Changping fault zone
detachment fault
basin-and-range-like structural pattern
Northeastern Hunan Province
Jiangnan Orogen
South China
