Porphyry Cu deposits linked to episodic growth of an underlying parental magma chamber

作     者：Yuanchuan ZHENG Lu WANG Chuandong XUE Bo XU Abdul GHAFFAR Zhusen YANG Yongjun LU Limin ZHOU William L.GRIFFIN Zengqian HOU Yuanchuan ZHENG;Lu WANG;Chuandong XUE;Bo XU;Abdul GHAFFAR;Zhusen YANG;Yongjun LU;Limin ZHOU;William L.GRIFFIN;Zengqian HOU

作者机构：State Key Laboratory of Geological Processes and Mineral Resourcesand School of Earth Science and ResourcesChina University of GeosciencesBeijing 100083China ARC Centre of Excellence for Core to Crust Fluid Systems(CCFS)-GEMOCMacquarie UniversityNew South Wales 2109Australia Department of Earth SciencesKunming University of Science and TechnologyKunming 650093China Institute of Mineral ResourcesChinese Academy of Geological SciencesBeijing 100037China Geological Survey of Western AustraliaEast Perth 6004Australia Centre for Exploration Targeting and Australian Research Council Centre of Excellence for Core to Crust Fluid Systems(CCFS)School of Earth Sciencesthe University of Western AustraliaCrawley 6009Australia National Research Centre for GeoanalysisChinese Academy of Geological SciencesBeijing 100037China Institute of GeologyChinese Academy of Geological SciencesBeijing 100037China 

出 版 物：《Science China Earth Sciences》 (中国科学（地球科学英文版）)

年 卷 期：2020年第63卷第11期

页      面：1807-1816页

核心收录：

学科分类：081803[工学-地质工程] 08[工学] 0708[理学-地球物理学] 0818[工学-地质资源与地质工程] 0704[理学-天文学] 

基　　金：supported by the National Key Research and Development Program of China(Grant No.2016YFC0600310) the National Natural Science Foundation of China(Grant Nos.41872083 and 41702091) the Program of the China Geological Survey(Grant No.DD20160024-07) the China Fundamental Research Funds for the Central Universities(Grant No.2652018133) the 111 Project of the Ministry of Science and Technology(Grant No.BP0719021) 

主　　题：Apatite Plagioclase Episodic injection Parental magma chamber Porphyry Cu deposit 

摘      要：Saindak is one of the typical porphyry Cu deposits(PCDs)in the Chagai magmatic arc in ***-forming porphyries at Saindak PCD are mainly composed of ***,we use geochemistry of apatite enclosed in plagioclase phenocrysts from the ore-forming tonalite to constrain the releasing and recharging processes of S and Cl in the underlying parental magma chamber during PCD *** apatite inclusions have homogeneous intra-grain S and Cl compositions,there is significant inter-grain S and Cl variations in apatite inclusions located from core to rim in the hosting *** inter-grain S and Cl variation in apatites are coupled with the core-to-rim trends of An,FeO and Mg contents of the hosting plagioclase *** indicates that the Saindak PCD likely formed by episodic injection of primitive magmas during the growth of an underlying magma chamber,rather than by one major injection or by addition of mafic melt derived from different source *** primitive melt injection introduced essential ore-forming materials such as S and Cl,which were rapidly and effectively released to the coexisting fluids,causing *** primitive melt injection stops,signaling the end of growth of underlying magma chamber,mineralization will cease quickly although the hydrothermal system can still survive for a long ***,the later released fluids are relatively depleted in ore-forming materials,and thus have lower capability to generate ***,predominant porphyry-type mineralizations occurred during the growth rather than waning stage of a magmatic system.