地质通报2017，Vol.36Issue(6)：977-986,10.
东昆仑祁漫塔格虎头崖铅锌多金属矿成矿时代及其地质意义——黑云二长花岗岩地球化学特征和锆石U-Pb年龄证据
A study of the ore-forming age of the Hutouya deposit and its geological significance: Geochemistry and U-Pb zircon ages of biotite monzonitic granite in Qimantag, East Kunlun Mountains
摘要
Abstract
The Hutouya Pb-Zn polymetallic ore deposit is located in Qimantag,East Kunlun Mountains.Intermediate-acid intrusive rocks occur widely in this area,and are closely related to iron polymetallic mineralization.The 206Pb/238U weighted average age is 234.2± 1.5Ma,which was obtained by in-situ LA-ICP-MS zircon dating of biotite monzonitic granite that was closely related to mineralization and skam.The results of geochemical analysis show that the biotite monzonitic granite is characterized by high Al2O3,K2O and low TiO2,Na2O.The I-type granites are characterized by rich LREE,Rb,Th and some of HFSE,but poor Nb,Sr and Zr,and clear separation of LREE from HREE.In diagram of (Y+ Nb)-Rb,all samples fall into post-collision granite area,and in R1-R2 diagram,all samples fall into the superimpositon of post-collision granite area and collision granite area,indicating that the granites probably formed in a collision-post-collision structural phase.The Ⅵ belt of the Hutouya Pb-Zn polymetallic ore deposit experiended strong skarnization.The authors hold that the deposit has characteristics of skarn deposit,as shown by its ore fabric,gangue minerals,wall rock alteration,and it was formed at 234.2±1.5Ma (Middle-Late Triassic).关键词
LA-ICP-MS锆石U-Pb测年/黑云二长花岗岩/构造环境/虎头崖铅锌多金属矿/矽卡岩型矿床Key words
LA-I CP-MS zircon U-Pb dating/biotite monzonitic granite/tectonic environment/Hutouya Pb-Zn polymetallic ore deposit/skam deposit分类
天文与地球科学引用本文复制引用
时超,李荣社,何世平,计文化,辜平阳,陈守建,张海迪..东昆仑祁漫塔格虎头崖铅锌多金属矿成矿时代及其地质意义——黑云二长花岗岩地球化学特征和锆石U-Pb年龄证据[J].地质通报,2017,36(6):977-986,10.基金项目
中国地质调查局项目《秦岭成矿带文康—凤太地区地质矿产调查》(编号:DD20160014)和《西南三江成矿带北段地质矿产综合调查》(编号:12120114044801) （编号:DD20160014）
