Geochemistry and Sr-Nd-Pb Isotopes of the Granites from the Hashitu Mo Deposit of Inner Mongolia, China: Constraints on Their Origin and Tectonic Setting
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This paper is part of the ongoing project ‘‘Superimposed tectonic activities and large-scale ore-forming processes of the Hinggan-Mongolia Orogenic Belt’’. It is financially supported by the State Basic Research Program of China (2013CB429805). The authors would like to thank the staff at Inner Mongolian Branch Geological Survey and Hulun Buir Bureau of Land and Mineral Resources and Inner Mongolian Mining Group for their field support. Jun Liu at the Chinese Academy of Geological Sciences is thanked for his detail and constructive comments on the manuscript. Finally, we would like to thank Jingwen Mao at the Institute of Mineral Resources, Chinese Academy of Geological Sciences for his excellent and professional revision of our manuscript.


Geochemistry and Sr-Nd-Pb Isotopes of the Granites from the Hashitu Mo Deposit of Inner Mongolia, China: Constraints on Their Origin and Tectonic Setting
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This paper is part of the ongoing project ‘‘Superimposed tectonic activities and large-scale ore-forming processes of the Hinggan-Mongolia Orogenic Belt’’. It is financially supported by the State Basic Research Program of China (2013CB429805). The authors would like to thank the staff at Inner Mongolian Branch Geological Survey and Hulun Buir Bureau of Land and Mineral Resources and Inner Mongolian Mining Group for their field support. Jun Liu at the Chinese Academy of Geological Sciences is thanked for his detail and constructive comments on the manuscript. Finally, we would like to thank Jingwen Mao at the Institute of Mineral Resources, Chinese Academy of Geological Sciences for his excellent and professional revision of our manuscript.

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    摘要:

    The Hashitu molybdenum deposit is located in the southern part of the Great Hinggan Range, NE China. Molybdenum mineralization is hosted by and genetically associated with monzogranite and porphyritic syenogranite. Sr-Nd-Pb isotopes of the intrusions show that the porphyritic syenogranite has initial 87Sr/86Sr ratios of 0.70418–0.70952, εNd(t) values of 1.3 to 2.1 (t=143 Ma), 206Pb/204Pb ratios of 19.191–19.573, 207Pb/204Pb ratios of 15.551–15.572, and 208Pb/204Pb ratios of 38.826–39.143. The monzogranite has initial 87Sr/86Sr ratios of 0.70293–0.71305, εNd(t) values of 1.1 to 2.0 (t=147 Ma), 206Pb/204Pb ratios of 19.507–20.075, 207Pb/204Pb ratios of 15.564–15.596, and 208Pb/204Pb ratios of 39.012–39.599. The calculated Nd model ages (TDM) for monzogranite and porphyritic syenogranite range from 866 to 1121 Ma and 795 to 1020 Ma, respectively. The granitic rocks in the Hashitu area have the same isotope range as granites in the southern parts of the Great Hinggan Range. The isotope composition indicates that these granites are derived from the partial melting of a juvenile lower crust originating from a depleted mantle with minor contamination by ancient continental crust. The integrating our results with published data and the Late Mesozoic regional tectonic setting of the region suggest that the granites in the Hashitu area formed in an intra-continent extensional setting, and they are related to the thinning of the thickened lithosphere and upwelling of the asthenosphere.

    Abstract:

    The Hashitu molybdenum deposit is located in the southern part of the Great Hinggan Range, NE China. Molybdenum mineralization is hosted by and genetically associated with monzogranite and porphyritic syenogranite. Sr-Nd-Pb isotopes of the intrusions show that the porphyritic syenogranite has initial 87Sr/86Sr ratios of 0.70418–0.70952, εNd(t) values of 1.3 to 2.1 (t=143 Ma), 206Pb/204Pb ratios of 19.191–19.573, 207Pb/204Pb ratios of 15.551–15.572, and 208Pb/204Pb ratios of 38.826–39.143. The monzogranite has initial 87Sr/86Sr ratios of 0.70293–0.71305, εNd(t) values of 1.1 to 2.0 (t=147 Ma), 206Pb/204Pb ratios of 19.507–20.075, 207Pb/204Pb ratios of 15.564–15.596, and 208Pb/204Pb ratios of 39.012–39.599. The calculated Nd model ages (TDM) for monzogranite and porphyritic syenogranite range from 866 to 1121 Ma and 795 to 1020 Ma, respectively. The granitic rocks in the Hashitu area have the same isotope range as granites in the southern parts of the Great Hinggan Range. The isotope composition indicates that these granites are derived from the partial melting of a juvenile lower crust originating from a depleted mantle with minor contamination by ancient continental crust. The integrating our results with published data and the Late Mesozoic regional tectonic setting of the region suggest that the granites in the Hashitu area formed in an intra-continent extensional setting, and they are related to the thinning of the thickened lithosphere and upwelling of the asthenosphere.

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DING Chengwu, DAI Pan, BAGAS Leon, NIE Fengjun, JIANG Sihong, WEI Junhao, DING Chengzhen, ZUO Pengfei, ZHANG Ke.2016. Geochemistry and Sr-Nd-Pb Isotopes of the Granites from the Hashitu Mo Deposit of Inner Mongolia, China: Constraints on Their Origin and Tectonic Setting[J]. ACTA GEOLOGICA SINICA(English edition),90(1):106~120

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  • 收稿日期:2015-04-09
  • 最后修改日期:2015-11-15
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  • 在线发布日期: 2016-02-07
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