Role of metasomatized mantle lithosphere in the formation of giant lode gold deposits:Insights from sulfur isotope and geochemistry of sulfides  

作　　者：Baisong Du Zuoman Wang M.Santosh Yuke Shen Shufei Liu Jiajun Liu Kexin Xu Jun Deng 

机构地区：[1]China National Gold Group Corporation Limited,Beijing 100011,China [2]State Key Laboratory of Geological Processes and Mineral Resources,School of Earth Sciences and Resources,China University of Geosciences(Beijing),Beijing 100083,China [3]Department of Earth Science,University of Adelaide,Adelaide SA 5005,Australia [4]Laboratory of Dynamic Digenesis and Metallogenesis,Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081,China [5]State Key Laboratory for Mineral Deposits Research,Nanjing University,Nanjing 210046,China

出　　处：《Geoscience Frontiers》2023年第5期153-172,共20页地学前缘（英文版）

基　　金：supported by the National Nature Science Foundation of China(Grant No.41730426)。

摘　　要：The Wulong deposit is one of the largest quartz vein-type gold deposits with at least 80 tons of identified gold reserves in the eastern part of the Liaodong Peninsula.Gold orebodies are mainly hosted in the Late Jurassic gneissic two-mica granite and Early Cretaceous diorite dykes,and are structurally controlled by the NNE-and NW-trending faults.Gold mineralization mainly occurs as veins with lenticular shapes and is closely associated with sulfides and Bi minerals.Previous studies on the deposit mainly focused on its geological characteristics,fluid inclusions and the timing of gold mineralization.However,the extreme enrichment mechanism of gold,the geodynamic setting and ore source of the gold deposit remain equivocal.Here we present results from geochemical studies of pyrite and pyrrhotite at Wulong to address these issues.Pyrrhotite can be grouped into euhedral(Po1)and anhedral(Po2)varieties based on the textures.Four generations of pyrite were identified based on petrographic studies:Py1 is coarse-grained subhedral to euhedral crystal coexisting with milky quartz,and Au-depleted in composition;Py2 is represented by medium-grained,subhedral to anhedral pyrite coexisting with euhedral Po1,smoky quartz and minor chalcopyrite;Py3 occurs as fined-grained anhedral grains in the quartz-polymetallic sulfide veins;Py4 occurs as veinlets or aggregates in the quartz-calcite veins and contains the lowest Au concentrations.The time-resolved LA-ICP-MS ablation depth profiles of sulfides combined with detailed petrological observations indicate that gold mainly occurs either as invisible solid solution within the crystal lattice of sulfides,to some extent,or as small blebs of native gold and electrum.The close temporal and spatial relationships among native bismuth,native gold and Bi-Te-S minerals suggest that Bi-rich melts may have significantly sequestered gold from the hydrothermal fluids in the Wulong gold deposit.Sulfides from auriferous quartz veins have a restricted D33S range(-0.2‰to+0.2‰)and a mean d34S value

关 键 词：Sulfides Sulfur isotope Wulong gold deposit Liaodong Peninsula 

分 类 号：P618.51[天文地球—矿床学] P618.66[天文地球—地质学]