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Source and possible tectonic driver for Jurassic-Cretaceous gold deposits in the West Qinling Orogen, China
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  • 英文篇名:Source and possible tectonic driver for Jurassic-Cretaceous gold deposits in the West Qinling Orogen, China
  • 作者:Yafei ; Wu ; Jianwei ; Li ; Katy ; Evans ; Denis ; Fougerouse ; Kirsten ; Rempel
  • 英文作者:Yafei Wu;Jianwei Li;Katy Evans;Denis Fougerouse;Kirsten Rempel;State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences;School of Earth and Planetary Sciences, The Institute for Geoscience Research (TIGeR), Curtin University;School of Earth Resources, China University of Geosciences;
  • 英文关键词:Pyrite LA-ICP-MS;;Sulfur isotopes;;Daqiao gold deposit;;West Qinling Orogen;;Paleo-Paci?c plate;;Jurassice Cretaceous
  • 中文刊名:GSFT
  • 英文刊名:地学前缘(英文版)
  • 机构:State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences,Wuhan;School of Earth and Planetary Sciences, The Institute for Geoscience Research (TIGeR), Curtin University;School of Earth Resources, China University of Geosciences,Wuhan;State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences;
  • 出版日期:2019-01-15
  • 出版单位:Geoscience Frontiers
  • 年:2019
  • 期:v.10
  • 基金:financially supported by the National Natural Science Foundation of China (Grant No. 41325007);; the GPMR State Key Laboratory (grant MSFGPMR03);; the China Geological Survey (Grant No. 1212011120570);; National Demonstration Center for Experimental Mineral Exploration Education at China University of Geosciences (Wuhan)
  • 语种:英文;
  • 页:GSFT201901010
  • 页数:11
  • CN:01
  • ISSN:11-5920/P
  • 分类号:111-121
摘要
The West Qinling Orogen(WQO) in Central China Orogenic Belt contains numerous metasedimentary rock-hosted gold deposits(>2000 t Au), which mainly formed during two pulses: one previously recognized in the Late Triassic to Early Jurassic(T3 - J1) and one only recently identified in the Late Jurassic to Early Cretaceous(J3 - K1). Few studies have focused on the origin and geotectonic setting of the J3 - K1 gold deposits.Textural relationships, LA-ICP-MS trace element and sulfur isotope compositions of pyrites in hydrothermally altered T3 dykes within the J3 - K1 Daqiao deposit were used to constrain relative timing relationships between mineralization and pyrite growth in the dykes, and to characterize the source of ore fluid. These results are integrated with an overview of the regional geodynamic setting, to advance understanding of the tectonic driver for J3 - K1 hydrothermal gold systems. Pyrite in breccia-and dykehosted gold ores at Daqiao have similar chemical and isotopic compositions and are considered to be representative of J3 - K1 gold deposits in WQO. Co/Ni and sulfur isotope ratios suggest that ore fluids were derived from underlying Paleozoic Ni-and Se-rich carbonaceous sedimentary rocks. The geochemical data do not support the involvement of magmatic fluids. However, in the EQO(East Qinling Orogen), J3 - K1 deposits are genetically related to magmatism. Gold mineralization in WQO is contemporaneous with magmatic deposits in the EQO and both are mainly controlled by NE-and EWtrending structures produced by changes in plate motion of the Paleo-Pacific plate as it was subducted beneath the Eurasian continent. We therefore infer that the J3 - K1 structural regime facilitated the ascent of magma in the EQO and metamorphic fluids in the WQO with consequent differences in the character of contemporaneous ore deposits. If this is correct, then the far-field effects of subduction along the eastern margin of NE Asia extended 1000's of km into the continental interior.
        The West Qinling Orogen(WQO) in Central China Orogenic Belt contains numerous metasedimentary rock-hosted gold deposits(>2000 t Au), which mainly formed during two pulses: one previously recognized in the Late Triassic to Early Jurassic(T3 - J1) and one only recently identified in the Late Jurassic to Early Cretaceous(J3 - K1). Few studies have focused on the origin and geotectonic setting of the J3 - K1 gold deposits.Textural relationships, LA-ICP-MS trace element and sulfur isotope compositions of pyrites in hydrothermally altered T3 dykes within the J3 - K1 Daqiao deposit were used to constrain relative timing relationships between mineralization and pyrite growth in the dykes, and to characterize the source of ore fluid. These results are integrated with an overview of the regional geodynamic setting, to advance understanding of the tectonic driver for J3 - K1 hydrothermal gold systems. Pyrite in breccia-and dykehosted gold ores at Daqiao have similar chemical and isotopic compositions and are considered to be representative of J3 - K1 gold deposits in WQO. Co/Ni and sulfur isotope ratios suggest that ore fluids were derived from underlying Paleozoic Ni-and Se-rich carbonaceous sedimentary rocks. The geochemical data do not support the involvement of magmatic fluids. However, in the EQO(East Qinling Orogen), J3 - K1 deposits are genetically related to magmatism. Gold mineralization in WQO is contemporaneous with magmatic deposits in the EQO and both are mainly controlled by NE-and EWtrending structures produced by changes in plate motion of the Paleo-Pacific plate as it was subducted beneath the Eurasian continent. We therefore infer that the J3 - K1 structural regime facilitated the ascent of magma in the EQO and metamorphic fluids in the WQO with consequent differences in the character of contemporaneous ore deposits. If this is correct, then the far-field effects of subduction along the eastern margin of NE Asia extended 1000's of km into the continental interior.
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