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Age and metal source of orogenic gold deposits in Southeast Guizhou Province, China: Constraints from Re-Os and He-Ar isotopic evidence
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  • 英文篇名:Age and metal source of orogenic gold deposits in Southeast Guizhou Province, China: Constraints from Re-Os and He-Ar isotopic evidence
  • 作者:Jiasheng ; Wang ; Hanjie ; Wen ; Chao ; Li ; Jinrang ; Zhang ; Wei ; Ding
  • 英文作者:Jiasheng Wang;Hanjie Wen;Chao Li;Jinrang Zhang;Wei Ding;Southwest Institute of Geological Survey,Kunming University of Science and Technology;State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences;National Research Center for Geoanalysis;
  • 英文关键词:Re-Os geochronology;;Arsenopyrite;;He-Ar isotopes;;Pingqiu;;Jinjing;;Southeast Guizhou Province,China
  • 中文刊名:Geoscience Frontiers
  • 英文刊名:地学前缘(英文版)
  • 机构:Southwest Institute of Geological Survey,Kunming University of Science and Technology;State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences;National Research Center for Geoanalysis;
  • 出版日期:2019-03-15
  • 出版单位:Geoscience Frontiers
  • 年:2019
  • 期:02
  • 基金:jointly supported by the National Natural Science Foundation of China (Grant Nos. 41303038, 41772070);; Open Fund of State Key Laboratory of Ore Deposit Geochemistry (201502);; the National Basic Research Program of China (2014CB440904)
  • 语种:英文;
  • 页:226-238
  • 页数:13
  • CN:11-5920/P
  • ISSN:1674-9871
  • 分类号:P618.51;P597
摘要
The orogenic gold deposits in Southeast Guizhou are an important component of the Xuefeng polymetallic ore belt and have significant exploration potential, but geochronology research on these gold deposits is scarce. Therefore, the ore genetic models are poorly constrained and remain unclear. In the present study, two important deposits(Pingqiu and Jinjing) are investigated, including combined Re-Os dating and the He-Ar isotope study of auriferous arsenopyrites. It is found that the arsenopyrites from the Pingqiu gold deposit yielded an isochron age of 400 ± 24 Ma,with an initial ~(187)Os/~(188)Os ratio of 1.24 ± 0.57(MSWD = 0.96). An identical isochron age of 400 ± 11 Ma with an initial ~(187)Os/~(188)Os ratio of 1.55 ± 0.14(MSWD = 0.34) was obtained from the Jinjing deposit. These ages correspond to the regional Caledonian orogeny and are interpreted to represent the age of the main stage ore. Both initial ~(187)Os ratios suggest that the Os was derived from crustal rocks. Combined with previous rare earth element(REE), trace elements, Nd-Sr-S-Pb isotope studies on scheelite, inclusion fluids with other residues of gangue quartz, and sulfides from other gold deposits in the region, it is suggested that the ore metals from Pingqiu and Jinjing were sourced from the Xiajiang Group. The He and Ar isotopes of arsenopyrites are characterized by ~3 He/~4 He ratios ranging from 5.3 × 10~(-4) Ra to 2.5 × 10~(-2) Ra(Ra = 1.4 × 10~(-6), the ~3 He/~4 He ratio of air), 40 Ar=/~4 He ratios from 0.64 × 10~(-2) to 15.39×10~(-2), and ~(40)Ar/~(36)Ar ratios from 633.2 to 6582.0. Those noble gas isotopic compositions of fluid inclusions also support a crustal source origin,evidenced by the Os isotope. Meanwhile, recent noble gas studies suggest that the amount of in situ radiogenic ~4 He generated should not be ignored, even when Th and U are present at levels of only a few ppm in host minerals.
        The orogenic gold deposits in Southeast Guizhou are an important component of the Xuefeng polymetallic ore belt and have significant exploration potential, but geochronology research on these gold deposits is scarce. Therefore, the ore genetic models are poorly constrained and remain unclear. In the present study, two important deposits(Pingqiu and Jinjing) are investigated, including combined Re-Os dating and the He-Ar isotope study of auriferous arsenopyrites. It is found that the arsenopyrites from the Pingqiu gold deposit yielded an isochron age of 400 ± 24 Ma,with an initial ~(187)Os/~(188)Os ratio of 1.24 ± 0.57(MSWD = 0.96). An identical isochron age of 400 ± 11 Ma with an initial ~(187)Os/~(188)Os ratio of 1.55 ± 0.14(MSWD = 0.34) was obtained from the Jinjing deposit. These ages correspond to the regional Caledonian orogeny and are interpreted to represent the age of the main stage ore. Both initial ~(187)Os ratios suggest that the Os was derived from crustal rocks. Combined with previous rare earth element(REE), trace elements, Nd-Sr-S-Pb isotope studies on scheelite, inclusion fluids with other residues of gangue quartz, and sulfides from other gold deposits in the region, it is suggested that the ore metals from Pingqiu and Jinjing were sourced from the Xiajiang Group. The He and Ar isotopes of arsenopyrites are characterized by ~3 He/~4 He ratios ranging from 5.3 × 10~(-4) Ra to 2.5 × 10~(-2) Ra(Ra = 1.4 × 10~(-6), the ~3 He/~4 He ratio of air), 40 Ar=/~4 He ratios from 0.64 × 10~(-2) to 15.39×10~(-2), and ~(40)Ar/~(36)Ar ratios from 633.2 to 6582.0. Those noble gas isotopic compositions of fluid inclusions also support a crustal source origin,evidenced by the Os isotope. Meanwhile, recent noble gas studies suggest that the amount of in situ radiogenic ~4 He generated should not be ignored, even when Th and U are present at levels of only a few ppm in host minerals.
引文
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