江西铁砂街铜矿变基性岩锆石年代学及其地质意义  

Zircon Geochronology and Its Geological Significance Metabasite in Tieshajie Copper Deposit,Jiangxi Province

作　　者：罗平[1] 黄鸿新 张达[2] 黄卫平 狄永军[2] LUO Ping;HUANG Hong-xin;ZHANG Da;HUANG Wei-ping;DI Yong-jun(Northeastern Jiangxi Geological Party,Bureau of Geology and Mineral Resources of Jiangxi Province,Shangrao 334000,China;School of Earth Sciences and Resources,China University of Geosciences,Beijing 100083,China)

机构地区：[1]江西省地矿局赣东北大队,江西上饶334000 [2]中国地质大学(北京),北京100083

出　　处：《东华理工大学学报（自然科学版）》2020年第6期521-526,共6页Journal of East China University of Technology(Natural Science)

基　　金：中国地质调查局地质调查项目(1212010813064)。

摘　　要：铁砂街铜矿位于钦杭结合带东段浙西地体南西部,是与海底火山热液喷发沉积作用有关的VMS型矿床。SHRIMP锆石U-Pb定年法测定赋矿地层中绿泥石阳起石化变基性岩的锆石年龄,获得年龄值为(1153±38)Ma。地质证据和测年结果表明铁砂街铜矿成岩成矿时期为中元古代晚期(1150 Ma),处于中元古代晚期—新元古代早期钦杭结合带两侧多岛洋演化阶段,在岛弧的俯冲环境下形成细碧岩石英角斑岩建造。研究结果为铁砂街铜矿成岩成矿年龄提供了可靠的年龄数据,对深入了解铁砂街铜矿的成因和演化具有重要地质意义。The Tieshajie copper deposit,located in the western Zhejiang terrane in the eastern part of the Qinhang combination belt,is a VMS type deposit related to submarine volcanic hydrothermal eruption and sedimentation.SHRIMP zircon U-Pb dating method is used to determine the zircon age of chlorite actinolite metamorphic mafic rocks in ore-bearing strata,and the age value is(1153±38)Ma.Geological evidence and dating results show that the Tieshajie copper deposit was fomed in the late Mesoproterozoic(1150 Ma),regionally in the stage of multi-island ocean evolution on both sides of the Qinhang combination zone from late Mesoproterozoic to early Neoproterozoic,and formed spilite-quartz angle porphyry formation in the subduction environment of the island arc.It provides reliable age data for the metallogenic age of the Tieshajie copper deposit,and has important geological significance for further understanding the genesis and evolution of the Tieshajie copper deposit.

关 键 词：铁砂街铜矿 中元古代 SHRIMP锆石U-PB定年 钦杭结合带 

分 类 号：P618.41[天文地球—矿床学] P597[天文地球—地质学]