四川省小金县小草坝钨钼矿床成矿时限探析  

Discussion on metallogenic time of the Xiaocaoba tungsten molybdenum deposit in Xiaojin County,Sichuan Province

作　　者：宋立强 宋玮 柴重阳 吕国营 燕长海 SONG Liqiang;SONG Wei;CHAI Chongyang;LYU Guoying;YAN Changhai(Henan Institute of Geological Sciences,Zhengzhou 450001,Henan,China;Henan Key Laboratory for Metallogenetic Process of Metal Mineral Resource and Resource Utilization,Zhengzhou 450001,Henan,China;Henan Institute of Geological Survey,Zhengzhou 450001,Henan,China)

机构地区：[1]河南省地质科学研究所,河南郑州450001 [2]河南省金属矿产成矿地质过程与资源利用重点实验室,河南郑州450001 [3]河南省地质调查院,河南郑州450001

出　　处：《矿产勘查》2022年第11期1612-1623,共12页Mineral Exploration

摘　　要：小草坝钨钼矿床是近年来在扬子西缘成矿带中发现的大型矽卡岩型白钨矿床。本文首次对其成矿岩体进行了锆石U-Pb同位素测年,获得LA-ICP-MS锆石U-Pb平均年龄为(200.7±0.9)Ma,并对硅化—辉钼矿化阶段的辉钼矿进行了Re-Os测年,获得加权平均年龄为(201.6±1.3)Ma,结合区域地质演化历史,厘定出小草坝钨钼矿床的成矿时限处于松潘—甘孜地体造山后的伸展阶段,其成矿时代下限为岩体侵入时限,上限为硅化—辉钼矿化阶段的辉钼矿年龄,其成矿时限推测为203~200 Ma,处于晚三叠世的末期。The Xiaocaoba tungsten-molybdenum deposit is a large-scale skarn-type scheelite deposit discovered in the western Yangtze metallogenic belt in recent years.For the first time,the zircon U-Pb isotopic dating of the ore-forming rock body has been carried out,and the LA-ICP-MS zircon U-Pb has been obtained.The average age is(200.7±0.9)Ma,and the Re-Os dating of the molybdenite in the quartz sulfide stage is carried out,and the weighted average age is(201.6±1.3)Ma.Based on the regional geological evolution history,the Xiaocaoba tungsten is determined.The mineralization time limit of the molybdenum deposit is in the post-orogenic extension stage of the Songpan Ganzi terrane.The lower limit of the mineralization age is the intrusion time limit of the rock mass,and the upper limit is the molybdenite age in the quartz sulfide stage.The mineralization time is estimated to be 203~200 Ma at the end of late Triassic.

关 键 词：钨钼矿床 葫芦海子 成矿时限 晚三叠世 

分 类 号：P597[天文地球—地球化学]