Robust Timing Constraints for Granitic Magmatism and Hydrothermal Mineralization in the Tieshanlong W-Sn Ore Field,Eastern Nanling Range,South China  

作　　者：LI Wei TANG Juxing GUO Na LANG Xinghai SONG Shiwei WU Zhongru PENG Linlin FANG Xiang CHEN Binfeng LIAN Dunmei LU Jie 

机构地区：[1]The Seventh Geological Brigade of Jiangxi Bureau of Geology,Key Laboratory of Ionic Rare Earth Resources and Environment,Ganzhou,Jiangxi 341000,China [2]College of Earth and Planetary Sciences,Chengdu University of Technology,Chengdu 610059,China [3]Jiangxi Province Key Laboratory of Exploration and Development of Critical Mineral Resources,Nanchang 330036,China [4]MNR Key Laboratory of Metallogeny and Mineral Resource Assessment,Institute of Mineral Resources,CAGS,Beijing 100037,China [5]Institute of Earth Sciences,China University of Geosciences,Beijing 100083,China [6]Jiangxi Geological Bureau,Nanchang 330036,China [7]Chinese Academy of Geological Sciences,Beijing 100037,China

出　　处：《Acta Geologica Sinica(English Edition)》2024年第5期1255-1269,共15页地质学报（英文版）

基　　金：supported by the Young Science and Technology Leader Training Plan Project of Jiangxi Bureau of Geology(Grant No.2024JXDZKJRC01);the Key Laboratory of Ionic Rare Earth Resources and Environment,Ministry of Natural Resources of the People's Republic of China(Grant No.2022IRERE101);the National Key R&D Program of China(Grant No.2020YFA0406400);the Jiangxi Geological Survey Project(Grant Nos.20210041 and 20242001)。

摘　　要：The Tieshanlong ore field is an important part of the Nanling Range,which is famous worldwide for its W-Sn mineralization.Notably,the mineralization age of the Tieshanlong ore field is not well constrained,and our field investigation reveals that granitic emplacement occurred at different stages.However,previous studies have not distinguished these multiple stages of magmatism.The Tieshanlong granite complex is closely related to the Huangsha quartz vein-type W-Sn deposit and Tongling skarn-type Cu-W-Sn deposit in this field.Through field investigations and isotopic age analyses,this work studies the relationship between multistage magmatic activity and mineralization in the Tieshanlong ore field.LA-ICP-MS zircon U-Pb isotope analyses revealed that the first-and second-staged granites formed at 154.2±0.6 Ma(MSDW=1.4)and 151.2±0.4 Ma(MSDW=1.5),with zirconε_(Hf)(t)values ranging from-13.1 to-10.5 and from-14.7 to-11.1,respectively.These data suggest that the Tieshanlong granite complex was derived from the partial melting of ancient crustal material.LA-ICP-MS U-Pb dating of wolframite and cassiterite reveals that W-Sn mineralization occurred at 160-150 Ma,which agrees well with the U-Pb dating results of the second-staged granite within analytical errors.The magmatic activity in this ore field can be divided into three stages:175-154 Ma,154-150 Ma and 150-145 Ma.The quartz vein-and skarn-type W-Sn mineralization is closely related to second-staged fine-grained twomica granite,and formed earlier than skarn-type Cu-mineralization.This study establishes a metallogenic model for the Tieshanlong ore field,and this model has important practical significance for identifying concealed W-Sn(-Cu)deposits around other granitic complexes in the Nanling Range.

关 键 词：zircon U-Pb-Hf isotopes wolframite U-Pb ages cassiterite U-Pb ages metallogenic model Tieshanlong ore field Nanling Range 

分 类 号：P618.67[天文地球—矿床学] P618.44[天文地球—地质学]