| 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 Bi; Cheng-Biao Leng; Hong Zhong; Hong-Feng Tang; You-Wei Chen; Guang-Hou Yin; Ding-Zhu Huang; Mei-Fu Zhou
| |
| 通讯作者 | Xian-Wu Bi |
| 2014 | |
| 发表期刊 | Ore Geology Reviews
 |
| 卷号 | 61期号:1页码:73-95 |
| 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 = 13, 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 similar to 87.4 Ma to similar to 82.7 Ma. Combined with published molybdenite Re-Os age spectrum (similar to 85 Ma to similar 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 epsilon(Hf)(t) values (-7.9 to -2.3), and Proterozoic two-stages Hf model ages (T-Dm2 = 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. |
| 关键词 | Zircon U–pb Molybdenite Re–os Porphyry Mo–cu Deposits Meso-tethys Yidun Arc Sanjiang |
| 学科领域 | 矿床地球化学 |
| 收录类别 | SCI |
| 语种 | 英语 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.gyig.ac.cn/handle/352002/5211 |
| 专题 | 矿床地球化学国家重点实验室_矿床地球化学国家重点实验室_期刊论文 矿床地球化学国家重点实验室 地球深部物质与流体作用地球化学研究室 |
| 通讯作者 | Xian-Wu Bi |
| 推荐引用方式 GB/T 7714 | Xin-Song Wang,Xian-Wu Bi,Cheng-Biao Leng,et al. 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(1):73-95. |
| APA | Xin-Song Wang.,Xian-Wu Bi.,Cheng-Biao Leng.,Hong Zhong.,Hong-Feng Tang.,...&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(1),73-95. |
| MLA | Xin-Song Wang,et al."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 61.1(2014):73-95. |
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