Petrogenesis of the Hercynian Granite in the Shuangjianzishan Super-large Ag Polymetallic Deposit,Inner Mongolia and its Metallogenic Significance:Evidence from Geochronology and Petrogeochemistry  

作　　者：LIU Yu JIANG Biao WU Liwen ZUO Yushan LIU Zhao LIU Haitao 

机构地区：[1]MNR Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China [2]Geological Survey Institute of Inner Mongolia,Hohhot 010020,China [3]Inner Mongolia Geology and Mineral Exploration Co.,Ltd.,Hohhot 010010,China

出　　处：《Acta Geologica Sinica(English Edition)》2025年第2期459-472,共14页地质学报(英文版)

基　　金：financed by the Inner Mongolia Geological Exploration Fund Project(Grant No.2020-YS03);the project of-Geology of Mineral Resources in China‖from China Geological Survey(Grant Nos.DD20221695,DD20190379,DD20160346);the Project of Transformation in Scientific and Technological Achievements(Grant Nos.2023CX10,HE2121);the Fundamental Research Funds of the Central Public Welfare Scientific Research Institutes(Grant No.JKYZD202313).

摘　　要：The Shuangjianzishan deposit is a typical magmatic-hydrothermal deposit located in the southern Great Xing'an Range.Recent investigations have identified significant copper and tin mineralization at depth within the Shuangjianzishan deposit;however,the coupling relationship between magmatic emplacement and mineralization processes remains debated.This study presents whole-rock geochemistry,zircon LA-ICP-MS U-Pb dating,and zircon Hf isotope analyses of granite from the northern Shuangjianzishan deposit.The analysis results indicate the granite crystallized between 252.3 and 257.9 Ma,corresponding to Late Permian magmatic activity.The granite displaysε_(Hf)(t)=5.95-14.87,and t_(DM2)=333-900 Ma.Geochemically,the granite is rich in Si and Al,with high K,classified as a calc-alkaline,weakly peraluminous rock.LREEs are enriched,while HREEs are depleted,and a slight negative Eu anomaly,all of which are consistent with A-type granite characteristics.The Hercynian granite in the Shuangjianzishan deposit formed during the latter or post-collisional stages of the collision orogeny following the closure of the Paleo-Asian Ocean in the late Paleozoic era.The material source indicates a mixed origin,involving both crust and mantle contributions.The granite is also enriched in Cu,Pb,and Zn,suggesting its potential role as an ore-forming material source for the Shuangjianzishan deposit.This study proposes a potential link between Hercynian magmatism and mineralization at the Shuangjianzishan deposit for the first time,suggesting that multistage metallogenesis may be a response to successive magmatic events from Hercynian to Yanshanian periods in the mining area.

关 键 词：GRANITE zircon U-Pb age PETROGENESIS mineralization Shuangjianzishan deposit Great Xing'an Range 

分 类 号：P618.2[天文地球—矿床学] P618.41[天文地球—地质学]