Metallogenetic model of Jiaodong-type gold deposits,eastern China  

作　　者：Jun DENG Qingfei WANG Liang ZHANG Shengchao XUE Xuefei LIU Lin YANG Liqiang YANG Kunfeng QIU Yayun LIANG 

机构地区：[1]State Key Laboratory of Geological Process and Mineral Resources,China University of Geosciences,Beijing,100083,China [2]Frontiers Science Center for Deep-time Digital Earth,China University of Geosciences,Beijing,100083,China [3]School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing,100083,China

出　　处：《Science China Earth Sciences》2023年第10期2287-2310,共24页中国科学（地球科学英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.42130801,42125203,42261134535,41230311,42272071);the National Key Research and Development Program(Grant No.2019YFA0708603);the 111 Project of the Ministry of Science and Technology(Grant No.BP0719021);the Fundamental Research Funds for the Central Universities(Grant Nos.2652023001,3-7-8-2023-09)。

摘　　要：The genesis of giant gold provinces is an international scientific frontier,in which the source of a huge amount of gold and the drive for mineralization are key challenges.The mineralization intensity of the Jiaodong gold province in eastern China is a rare occasion in the world,because it owns gold reserves of~5500 tons within an area of less than 10,000 km^(2).The Jiaodong gold province formed in the superimposed domain of diverse tectonic regimes in an intracontinental setting.Paleoproterozoic regional peak metamorphism and Triassic continental collision are followed by the tectonic transition and gold mineralization at ca.120 Ma with time intervals of 1.9 billion years and about 100 million years,respectively.The Jiaodong gold deposits are different from orogenic and intrusion-related gold deposits in terms of the tectonic background,types of host rocks,and oreforming mechanism.These gold deposits show close spatial-temporal and genetic relationships to mafic igneous rocks,implying the derivation of ore-forming fluids from the metasomatic mantle domains.Mafic dykes in Jiaodong have negativeε_(Hf)(t)values of-29.9 to-9.1,Os content of 0.002-0.16 ppb,heavyδ^(18)O up to 8.23‰,and high initial^(187)Os/^(188)Os ratios of 0.1352-0.8858.These indicate that the lithospheric mantle was metasomatized by ancient crust-derived components.The lithospheric mantle in the western Jiaodong shows generally more enriched isotope features than that in the eastern part,which is explained to be an important reason for its huge gold resources.The mafic dykes show lighter Mg isotope characteristics(averageδ^(26)Mg of-0.33‰,n=50)and high Ca O content(overall greater than 6.5 wt%),indicating that the lithospheric mantle would also record the metasomatism by the carbonate rocks from the subducting oceanic slab.Under the background of the rollback of the subducting paleo-Pacific slab and the destruction of the North China Craton,partial melting of the lower crust would produce granitic magmas that led to the enrichment of gold i

关 键 词：Jiaodong-type gold deposits Mantle fluids Metasomatized lithospheric mantle Source of gold Tectonic regime transition 

分 类 号：P618.51[天文地球—矿床学]