Geochronology and geochemistry of Late Cretaceous igneous intrusions and Mo–Cu–(W) mineralization in the southern Yidun Arc, SW China: Implications for metallogenesis and geodynamic setting | |
Xin-Song Wang; Xian-Wu; Cheng-Biao Leng; Hong Zhong; Hong-Feng Tang; You-Wei Chen; Guang-Hou Yin; Ding-Zhu Huang; Mei-Fu Zhou | |
刊名 | Ore Geology Reviews
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2014 | |
卷号 | 61页码:73-95 |
关键词 | Zircon U–pb molybdenite Re–os porphyry Mo–cu Deposits meso-tethys yidun Arc sanjiang |
英文摘要 | The Sanjiang Tethyan Metallogenic Domain (STMD) is an important part of the Tethyan giant metallogenic belt. The Yidun Arc is a part of the STMD in the eastern Tibetan Plateau. Recently, four newly discovered Mo–Cu–(W) ore deposits related to granitic intrusions were found distributed along the north-south strike in the southern Yidun Arc, which are identified as the Xiuwacu, Relin, Hongshan, and Tongchanggou deposits herein. These four deposits formed along high-angle north-northwest or north-west strike-slip faults, with vein-type and porphyry-type Mo–Cu mineralization developed in the intrusions. Molybdenite Re–Os and zircon U–Pb dating together with zircon Hf isotopes and whole-rock geochemistry of the intrusions were studied to discern the relationship between mineralization and magmatism, metallogenesis, and tectonic settings. Molybdenite from skarn-type mineralization at the Hongshan deposit has a Re–Os isochron age of 81.2 ± 2.6 Ma (MSWD = 1.3, n = 5) consistent with previously published zircon U–Pb ages and Re–Os ages of porphyry-type Mo mineralization. These results indicate that the Hongshan is a Late Cretaceous porphyry-skarn Cu–Mo deposit. Zircon U–Pb ages of the granitic intrusions in the Xiuwacu, Relin, and Tongchanggou deposits varying from ~ 87.4 Ma to ~ 82.7 Ma. Combined with published molybdenite Re–Os age spectrum (~ 85 Ma to ~ 81.2 Ma), it is proposed that the Mo–Cu–(W) mineralization in the Shangri-La region is spatially, temporally, and probably genetically related to the Late Cretaceous granitic intrusions. The Relin, Hongshan, and Tongchanggou intrusions have high SiO2 (65.2–70.0 wt.%), Sr (363–905 ppm), Sr/Y (22–72), and La/Yb (37–69) ratios, and low Y (11.6–17.0 ppm) and Yb (0.97–1.59 ppm), which displayed adakitic affinities. Their low MgO (0.66–1.44 wt.%), Mg# (25–46), variable negative zircon εHf(t) values (− 7.9 to − 2.3), and Proterozoic two-stages Hf model ages (TDM2 = 1.13–1.62 Ga) suggest that they were probably dominantly derived from partial melting of thickened lower continental crust. According to the tectonic evolution of the Bangong Meso-Tethys Ocean during the Late Mesozoic, the Late Cretaceous igneous event and mineralization in the Yidun Arc likely formed under a late- or post-collision extensional environment, probably related to the collision between the Lhasa and Qiangtang terranes during the Late Cretaceous. |
语种 | 英语 |
内容类型 | 期刊论文 |
源URL | [http://ir.gyig.ac.cn/handle/42920512-1/9352] ![]() |
专题 | 地球化学研究所_矿床地球化学国家重点实验室 |
作者单位 | 1.State Key Laboratory of Ore Deposits Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550005, China 2.University of Chinese Academy of Sciences, Beijing 100049, China 3.Yunnan Bureau of Geological Survey, Kunming 650051, China 4.Department of Earth Sciences, The University of Hong Kong, Hong Kong 999007, China |
推荐引用方式 GB/T 7714 | Xin-Song Wang;Xian-Wu;Cheng-Biao Leng;Hong Zhong;Hong-Feng Tang;You-Wei Chen;Guang-Hou Yin;Ding-Zhu Huang;Mei-Fu Zhou. Geochronology and geochemistry of Late Cretaceous igneous intrusions and Mo–Cu–(W) mineralization in the southern Yidun Arc, SW China: Implications for metallogenesis and geodynamic setting[J]. Ore Geology Reviews,2014,61:73-95. |
APA | Xin-Song Wang;Xian-Wu;Cheng-Biao Leng;Hong Zhong;Hong-Feng Tang;You-Wei Chen;Guang-Hou Yin;Ding-Zhu Huang;Mei-Fu Zhou.(2014).Geochronology and geochemistry of Late Cretaceous igneous intrusions and Mo–Cu–(W) mineralization in the southern Yidun Arc, SW China: Implications for metallogenesis and geodynamic setting.Ore Geology Reviews,61,73-95. |
MLA | Xin-Song Wang;Xian-Wu;Cheng-Biao Leng;Hong Zhong;Hong-Feng Tang;You-Wei Chen;Guang-Hou Yin;Ding-Zhu Huang;Mei-Fu Zhou."Geochronology and geochemistry of Late Cretaceous igneous intrusions and Mo–Cu–(W) mineralization in the southern Yidun Arc, SW China: Implications for metallogenesis and geodynamic setting".Ore Geology Reviews 61(2014):73-95. |
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