赣南珠坑钨矿赋矿花岗岩独居石年龄、地球化学特征及成因探究
Monazite U-Pb age,geochemistry,and genesis of ore-bearing granites in the Zhukeng tungsten deposit,southern Jiangxi Province
摘要
Abstract
[Objective]The composite Zhukeng granite is composed of two-mica granite and muscovite granite and closely related to tungsten and niobium-tantalum deposits in southern Jiangxi Province.[Methods]Based on systematic lithogeochemical analysis and rock-forming age determination of muscovite granite and two-mica granite from the Zhukeng tungsten deposit,combined with regional studies concerning diagenesis and mineralization,the genesis and tectonic setting of the rock mass are discussed.[Result]The LA-ICP-MS analysis of monazite from the fine-grained muscovite granite yielded a 206Pb/238U weighted average U-Pb age of 156.7±1.3 Ma.Major elements exhibit high silica contents(SiO2 ranging from 65.54%to 74.95%),high alkalis contents(Na2O+K2O ranging from 8.48%to 12.85%),high aluminum contents(A/CNK ratios ranging from1.10 to 1.22),and low magnesium contents.The total rare earth elements(ΣREE)range from 61.12×10-6 to 173.98×10-6,and there are right-dipping light rare earth enrichment patterns with a weak negative Eu anomalies.The trace elements Rb,Ta,Th,Pb,Nd,and Hf are enriched,while Ba,Nb,Sr,and Ti are depleted,indicating a highly differentiated S-type granite.The LA-ICP-MS analysis of monazite U-Pb from the two-mica granite yielded an 206Pb/238U weighted average age of 159.5±0.5 Ma.Major elements exhibit high silica contents(SiO2 ranging from 75.02%to 77.03%),high alkalis contents(Na2O+K2O ranging from 5.92%to 8.58%),high aluminum contents(A/CNK ranging from 1.14 to 1.65),and low magnesium contents.Total rare earth elements(ΣREE)range from 106.86×10-6 to 124.24×10-6,and there are right-dipping light rare earth enrichment patterns with a significant negative Eu anomalies.The trace elements Rb,Ta,Th,Pb,Nd,and Hf are enriched,while Ba,Nb,Sr,and Ti are depleted,suggesting a highly differentiated S-type granite.[Conclusion]By combining geochronological and lithogeochemical characteristics,the authors conclude that the Zhukeng tungsten deposit formed during an Upper Jurassic mineralization event caused by large-scale granitic magmatic activity related to subduction.关键词
赣南/珠坑岩体/花岗岩型钨矿/独居石U-Pb定年/地球化学Key words
southern Jiangxi Province/Zhukeng pluton/granite type tungsten deposit/monazite U-Pb dating/geochemistry分类
天文与地球科学引用本文复制引用
高原,张思远,张福神,王颖,王海,徐喆,张勇,周渝,张芳荣,孙超,贺彬..赣南珠坑钨矿赋矿花岗岩独居石年龄、地球化学特征及成因探究[J].地质力学学报,2025,31(2):325-339,15.基金项目
东华理工大学核资源与环境国家重点实验室开放基金项目(2022NRE09) （2022NRE09）
江西省关键矿产资源勘查与开发重点实验室开放基金(GHKC2024KF08) （GHKC2024KF08）
放射性地质与勘探技术国防重点学科实验室开放基金(2022RGET08) （2022RGET08）
国家自然科学基金项目(42062006) （42062006）
江西省自然科学基金项目(20232BAB213065) （20232BAB213065）
江西省地质局科技研究项目(2022JXDZKJKY02) （2022JXDZKJKY02）
江西省"科技+地质"联合计划项目(2023KDG01003) （2023KDG01003）
江西省地质局青年科学技术带头人培养计划项目(2022JXDZKJRC04)This research is financially supported by the Open Fund Project of the State Key Laboratory of Nuclear Resources and Environment of East China University of Technology(Grant No.2022NRE09),the Open Fund Project of Jiangxi Province Key Laboratory of Exploration and Development of Critical Mineral Resources(Grant No.GHKC2024KF08),the Open Fund Project of the Fundamental Science on Radioactive Geology and Exploration Technology Laboratory(Grant No.2022RGET08),the National Natural Science Foundation of China(Grant No.42062006),the Jiangxi Provincial Natural Science Foundation(Grant No.20232BAB213065),the Jiangxi Provincial Geological Bureau of Science and Technology Research Project(Grant No.2022JXDZKJKY02),the Jiangxi Province's Science-Technology and Geology Joint Project(Grant No.2023KDG01003)and the Training Program for the Young Talents in Science and Technology from the Jiangxi Provincial Bureau of Geology(Grant No.2022JXDZKJRC04). （2022JXDZKJRC04）
