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Genetic Types and Metallogenic Model for the Polymetallic Copper–Gold Deposits in the Tongling Ore District, Anhui Province, Eastern China

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Acta Geologica Sinica(English Edition) 2019年第1期93卷 88-110页

作者： FU Zhongyang XU Xiaochun HE Jun FAN Ziliang XIE Qiaoqin DU Jianguo CHEN Fang School of Resources and Environmental Engineering Hefei University of Technology Geological Survey of Anhui Province

The Tongling ore district is one of the most economically important ore areas in the Middle–Lower Yangtze River Metallogenic Belt, eastern China. It contains hundreds of polymetallic copper–gold deposits and occurrences. Those deposits are mainly clustered(from west to east) within the Tongguanshan, Shizishan, Xinqiao, Fenghuangshan, and Shatanjiao orefields. Until recently, the majority of these deposits were thought to be skarn-or porphyry–skarn-type deposits; however there have been recent discoveries of numerous vein-type Au, Ag, and Pb-Zn deposits that do not fall into either of these categories. This indicates that there is some uncertainty over this classification. Here, we present the results of several systematic geological studies of representative deposits in the Tongling ore district. From investigation of the ore-controlling structures, lithology of the host rock, mineral assemblages, and the characteristics of the mineralization and alteration within these deposits, three genetic types of deposits(skarn-, porphyry-, and vein-type deposits) have been identified. The spatial and temporal relationships between the orebodies and Yanshanian intrusions combined with the sources of the ore-forming fluids and metals, as well as the geodynamic setting of this ore district, indicate that all three deposit types are genetically related each other and constitute a magmatic–hydrothermal system. This study outlines a model that relates the polymetallic copper–gold porphyry-, skarn-, and vein-type deposits within the Tongling ore district. This model provides a theoretical basis to guide exploration for deep-seated and concealed porphyry-type Cu(–Mo, –Au) deposits as well as shallow vein-type Au, Ag, and Pb–Zn deposits in this area and elsewhere.

关键词： polymetallic copper–gold deposits genetic types metallogenic model magmatic–hydrothermal system Tongling ore district Anhui Province

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The exhumation history of collision-related mineralizing systems in Tibet:Insights from thermal studies of the Sharang and Yaguila deposits,central Lhasa

The exhumation history of collision-related mineralizing sys...

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中国科学院地质与地球物理研究所2015年度（第15届）...

作者： Junxing Zhao Kezhang Qin Guangming Li Mingjian Cao Noreen J.Evans Brent I.A.Mc Innes Jinxiang Li Bo Xiao Lei Chen Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of Sciences John De Laeter Center for Isotope Research Department of Applied Geology/Applied PhysicsCurtin University Key Laboratory of Continental Collision and Plateau Uplift Institute of Qinghai–Tibetan Plateau ResearchChinese Academy of Sciences MRL Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral ResourcesChinese Academy of Geological Sciences

The large,newly discovered Sharang porphyry Mo deposit and nearby Yaguila skarn Pb–Zn–Ag(–Mo) deposit reside in the central Lhasa terrane,northern Gangdese metallogenic belt,Tibet.Multiple mineral chronometers(zircon U–Pb,sericiteAr–Ar,and zircon and apatite(U–Th)/He) reveal that ore-forming porphyritic intrusions experienced rapid cooling(N 100 °C/Ma) during a monotonic magmatic–hydrothermal evolution.The magmatic–hydrothermal ore-forming event at Sharang lasted .0 Myr(.8 Myr for cooling from N 900 to 350 °C and .0 Myr for cooling from 350 to 200 °C) whereas cooling was more prolonged during ore formation at Yaguila(.8 Myr from N 900 to500 °C and a maximum of 6 Myr from N 900 to 350 °C).All porphyritic intrusions in the ore district experienced exhumation at a rate of 0.07–0.09 mm/yr(apatite He ages between 7 and 30 Ma).Combined with previous studies,this work implies that uplift of the eastern section of the Lhasa terrane expanded from central Lhasa(37–30 Ma)to southern Lhasa(15–12 Ma) at an increasing exhumation rate.All available geochronologic data reveal that magmatic–hydrothermal–exhumation activities in the Sharang–Yaguila ore district occurred within four periods of magmatism with related mineralization.Significant porphyry-type Mo mineralization was associated with Late Cretaceous–Eocene felsic porphyritic intrusions in the central Lhasa terrane,resulting from Neotethyan oceanic subduction and India–Asia continental collision.

关键词： Zircon U–Pb Sericite40Ar–39Ar Zircon and apatite（U–Th）/He magmatic–hydrothermal Thermal history Sharang porphyry Mo deposit Yaguila skarn Pb–Zn–Ag（–Mo） deposit Tibet

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