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Geology and geochemistry of the Triassic Wenquan Mo deposit and Mo-mineralized granite in the Western Qinling Orogen, China
Xiao Xiong;  Laimin Zhu;  Guowei Zhang;  Ben Li;  Liang Qi;  David Stevenson;  Tao Yang;  Fei Wang;  Jun Zheng;  Hang Jiang;  Anlin Guo
2016
发表期刊Gondwana Research
卷号30页码:159-178
摘要

The recently-discovered Wenquan porphyry Mo deposit hosted in the Wenquan granite of the West Qinling Orogen has been recognized as a product of the Indosinian metallogenesis. Three generations of mineral assemblage for the deposit are identified as follows: (1) quartz–biotite–K-feldspar; (2) quartz–sulfide and (3) sulfide–calcite. Geochemical study shows that the mafic microgranular enclaves(MMEs) in the ore-bearing Wenquan granite have lower SiO2, and higher Mg# and Nb/Ta ratios than the host granite itself. Different from the granite which have zircon εHf(t) values of − 3.6–3.0 and TDM2 of 1234–890 Ma, the MMEs are characterized by the εHf(t) values of − 10.1–10.8 and TDM1 of 865–441 Ma. This can be interpreted to indicate a mixture origin of the Meso- and Neoproterozoic crust-derived component and Neoproterozoic SCLM-derived materials for the formation of the Wenquan granite, which played an essential role in the Mo mineralization. Comparative Pb isotopic data between ores and K-feldspar suggest that the Wenquan granitic magma originated from the middle-lower crust of the South China Block and the ore-forming materials were incorporated by hydrothermal fluid differentiated from the Triassic magmatic system, with minor contribution of sedimentary rocks. The δ34S values of 5.0–11.7‰ with a pronounced mode at 5.0 to 6.1‰ for the ores probably represent the sulfur incorporation of a typical magmatic hydrothermal fluid contaminated by heavy sulfur of Devonian sediments. The granite yielded the zircon U–Pb ages of 218 ± 2.4 Ma and 221 ± 1.3 Ma, as the same as the ages of 217 ± 2.0 Ma and 218 ± 2.5 Ma obtained for the MMEs. These ages are indistinguishable with the molybdenite Re–Os isochron age of 219 ± 5.2 Ma which is the timing for the Mo mineralization. Tectonically, the magmatic mixture processes of the Wenquan granite and the Mo mineralization to form the Wenquan Mo deposit contemporaneously occurred during the transition of tectonic regime from syn- to post-collision orogeny in the Qinling Orogen in the Late Triassic.

关键词Wenquan Mo deposit Wenquan Granite mmes zircon magmatic Mixing triassic
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/42920512-1/9589
专题矿床地球化学国家重点实验室
作者单位1.State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China
2.Centre for Exploration Targeting, ARC Centre of Excellence for Core to Crust Fluid Systems (CCFS), School of Earth and Environment, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia
3.State Key Lab of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Science, Guiyang, China
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GB/T 7714
Xiao Xiong;Laimin Zhu;Guowei Zhang;Ben Li;Liang Qi;David Stevenson;Tao Yang;Fei Wang;Jun Zheng;Hang Jiang;Anlin Guo. Geology and geochemistry of the Triassic Wenquan Mo deposit and Mo-mineralized granite in the Western Qinling Orogen, China[J]. Gondwana Research,2016,30:159-178.
APA Xiao Xiong;Laimin Zhu;Guowei Zhang;Ben Li;Liang Qi;David Stevenson;Tao Yang;Fei Wang;Jun Zheng;Hang Jiang;Anlin Guo.(2016).Geology and geochemistry of the Triassic Wenquan Mo deposit and Mo-mineralized granite in the Western Qinling Orogen, China.Gondwana Research,30,159-178.
MLA Xiao Xiong;Laimin Zhu;Guowei Zhang;Ben Li;Liang Qi;David Stevenson;Tao Yang;Fei Wang;Jun Zheng;Hang Jiang;Anlin Guo."Geology and geochemistry of the Triassic Wenquan Mo deposit and Mo-mineralized granite in the Western Qinling Orogen, China".Gondwana Research 30(2016):159-178.
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