摘要
为深入研究吉林长白地区临江铜矿床与成矿有关的石英闪长玢岩的形成时代与意义,利用锆石LA-ICP-MS U-Pb测试方法,对石英闪长玢岩进行年龄测试。锆石定年结果显示,石英闪长玢岩获得2组年龄:第1组年龄为128.7±2.8 Ma和131.4±3.78 Ma,为捕获锆石年龄;第2组加权平均年龄为122.6±1.1 Ma(n=16,MSWD=0.80),代表石英闪长玢岩结晶年龄,属于早白垩世中期。结合前人研究,认为临江铜矿成矿构造环境有早白垩世古太平洋板块向欧亚大陆俯冲的地球动力学背景。
Zircon LA ICP-MS U-Pb analysis system was used to study metallogenic epoch of the Linjiang Copper deposit and age of the quartz diorite-porphyrite related to the formation of the deposit,Changbai area,Jilin Province.U-Pb dating results are two groups,the first one contains two captured detrital zircons with ^206Pb/^238 U ratio of 128.7±2.8 Ma and 131.4±3.78 Ma,the other group contains 16 zircons,which is interpreted to be the crystallization age of quartz diorite-porphyrite,with weighted mean ^206Pb/^238 U age of 122.6±1.1 Ma（n=16,MSWD=0.80）,belonging to the middle of Early Cretaceous.Combined with previous studies,we consider that the Linjiang Copper deposit was formed in a subduction geodynamic settings of the Paleo-pacific Plate beneath the Eurasia Plate in the early Cretaceous.
作者
杨宏智
逄伟
张朋
赵岩
张森
寇林林
YANG Hongzhi PANG Wei ZHANG Peng ZHAO Yan ZHANG Sen KOU Linlinl(Shenyang Institute of Geology and Mineral Resources, Shenyang 110034, China Shandong Geological Engineering Investigation Institute, Jinan 250014, China)
出处
《有色金属（矿山部分）》
2017年第4期30-34,共5页
NONFERROUS METALS(Mining Section）
基金
国家自然科学基金青年基金项目(41502093)
中国地质调查局基金项目(12120114037801)
关键词
石英闪长玢岩
锆石U-PB年龄
成矿构造环境
临江铜矿
吉林
Quartz diorite-porphyrite
LA-ICP-MS U-Pb
ore-forming environment
Linjiang copper deposit
Jilin Province
