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

Science China Earth Sciences 2020年第11期63卷 1807-1816页

作者： Yuanchuan ZHENG Lu WANG Chuandong XUE Bo XU Abdul GHAFFAR Zhusen YANG Yongjun LU Limin ZHOU William L.GRIFFIN Zengqian HOU State Key Laboratory of Geological Processes and Mineral Resources and School of Earth Science and ResourcesChina University of GeosciencesBeijing 100083China ARC Centre of Excellence for Core to Crust Fluid Systems(CCFS)-GEMOC Macquarie UniversityNew South Wales 2109Australia Department of Earth Sciences Kunming University of Science and TechnologyKunming 650093China Institute of Mineral Resources Chinese Academy of Geological SciencesBeijing 100037China Geological Survey of Western Australia East 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 Geoanalysis Chinese Academy of Geological SciencesBeijing 100037China Institute of Geology Chinese Academy of Geological SciencesBeijing 100037China

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.

关键词： Apatite Plagioclase Episodic injection parental magma chamber Porphyry Cu deposit

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