皖南泾县檀树岭钼矿床辉钼矿Re-Os和锆石U-Pb年代学及其地质意义  

Molybdenite Re-Os and Zircon U-Pb Chronology of Tanshuling Molybdenum Deposits from Jingxian County,Southern Anhui Province and Its Geological Significance

作　　者：穆玖清 王安东[1,2] 汪方跃[4] 王运[1,2] MU Jiu-qing;WANG An-dong;WANG Fang-yue;WANG Yun(State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,China;School of Earth Sciences,East China University of Technology,Nanchang 330013,China;The Fifth Geological Brigade of Hebei Bureau of Geology and Mineral Resources,Tangshan 063006,China;School of Resource and Environmental Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]东华理工大学核资源与环境省部共建国家重点实验室培育基地,南昌330013 [2]东华理工大学地球科学学院,南昌330013 [3]河北省地矿局第五地质大队,唐山063006 [4]合肥工业大学资源与环境工程学院,合肥230009

出　　处：《科学技术与工程》2025年第9期3555-3572,共18页Science Technology and Engineering

基　　金：国家自然科学基金(41763005);国家重点研发计划(2018YFA0404104);放射性地质与勘探技术国防重点学科实验室项目(RGET2209)。

摘　　要：檀树岭钼矿床处于江南隆起带内,位于江南断裂的南侧,其主体岩性为花岗闪长岩。为限定其成岩成矿时代和矿床成因,对其开展了锆石U-Pb年代学、辉钼矿Re-Os年代学和全岩主微量元素地球化学研究。结果表明:檀树岭花岗岩SiO_(2)含量为64.5%~66.8%,Al_(2)O_(3)含量为14.4%~16.0%,K_(2)O含量为3.92%~4.86%,Na_(2)O含量为2.90%~3.91%,CaO含量为1.56%~2.8%,MgO含量为1.24%~1.53%,A/CNK为1.02~1.10,A/NK为1.37~1.59,主量元素特征显示其属于准铝质-弱过铝质高钾钙碱性-钾玄岩系列的I型花岗岩。稀土元素球粒陨石标准化曲线明显右倾,轻稀土相对富集,Eu负异常。檀树岭辉钼矿的Re-Os定年结果为(133.09±0.86)Ma,茂林岩体花岗闪长岩的U-Pb定年结果为(140.4±0.62)Ma、(139.9±0.66)Ma、(139.6±0.63)Ma,均属于早白垩世。综合年代学和地球化学结果可见檀树岭钼矿床主要岩浆活动属于太平洋构造体制,挤压与伸展的相互交替使该地区发生了大规模的岩浆与成矿作用。The Tanshuling molybdenum deposit is located in the Jiangnan Uplift zone along south part of the Jiangnan Fault.Its main lithology type is granodiorite.With the aim to constrain their magma and ore-forming ages and deposit genesis,combined zircon U-Pb and molybdenite Re-Os geochronology together with whole-rock major and trace element geochemistry have been carried out.The result suggest that the content of SiO_(2)is 64.5%~66.8%,Al_(2)O_(3)is 14.4%~16.0%,K_(2)O is 3.92%~4.86%,Na_(2)O is 2.90%~3.91%,CaO is 1.56%~2.8%,MgO is 1.24%~1.53%,A/CNK value of 1.02~1.10,and A/NK value of 1.37~1.59.The characteristics of major elements show that the granites belong to metaaluminium to weak peraluminous high potassium calc-alkaline pot-assium series with I-type granite nature.The chondrite-normalized REE patterns are evidently right-declined,with relatively LREE enrichment and slight Eu negative anomalies.The molybdenite Re-Os age of the Tanshuling molybdenite is(133.09±0.86)Ma,and the U-Pb dating of the Maolin granodiorite is(140.4±0.62)Ma,(139.9±0.66)Ma,(139.6±0.63)Ma,all belong to the Early Cretaceous.Integrated chronological and geochemical characteristics show that the main magmatic activity of the Tanshuling molybdenum deposit belong to the Pacific tectonic system,and the alternation of extrusion and extensional has led to large-scale magmatic and mineralization in this area.

关 键 词：江南隆起带 I型花岗岩 地球化学 RE-OS定年 U-PB定年 

分 类 号：P597[天文地球—地球化学]