胶北地体古元古代中期花岗片麻岩的成因和构造意义——SHRIMP锆石U-Pb年龄和全岩地球化学约束
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P588.34+5;P588.12+1

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国家自然科学基金项目(41402167);自然资源部深地动力学重点实验室自主研究课题(J1901-20-9,J1901-8);中国地质科学院地质研究所基本科研业务经费(J1712,J2102);山东省重大科技创新工程项目


Petrogenesis and tectonic significance of mid-Paleoproterozoic granitic gneisses in the Jiaobei terrane,North China Craton:Constraints from SHRIMP zircon U-Pb dating and whole-rock geochemistry
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    摘要:

    报道了胶北地体古元古代中期花岗片麻岩的SHRIMP锆石年龄和全岩地球化学组成。锆石测年结果显示,本次研究的花岗片麻岩年龄为2 184~2 112 Ma,经历了~1.85 Ga的变质作用。尽管采自不同地区花岗片麻岩的地球化学组成存在明显差异,但它们普遍具有高SiO2、Na2O+K2O、Zr含量,高10 000Ga/Al值以及高的锆石饱和温度,指示其原岩为A型花岗岩。结合已发表数据,认为胶北古元古代中期花岗片麻岩原岩主要形成于2.13~2.10 Ga和2.19~2.17 Ga两个阶段。通过对比发现,2.13~2.10 Ga的花岗片麻岩具有更高的Zr含量和锆石饱和温度,且它们的锆石εHf (t)值也高于2.19~2.17 Ga的花岗片麻岩。2.19~2.17 Ga的花岗片麻岩原岩可能由胶北~2.7 Ga和~2.9 Ga的TTG高温脱水熔融而成,而2.13~2.10 Ga的花岗片麻岩原岩可能由胶北~2.5 Ga的TTG在更高的温度下部分熔融而成。两期花岗片麻岩原岩在源区和形成温度方面存在显著差异,暗示着胶北地体古元古代中期可能先后经历了两期不同的拉张作用。

    Abstract:

    In this study, SHRIMP zircon U-Pb ages and whole-rock geochemical data are reported for the mid-Paleoproterozoic granitic gneisses from the Jiaobei terrane, southeastern North China Craton. Geochronological results reveal that the granitic gneisses crystallized at 2 184~2 112 Ma and underwent metamorphism at ~1.85 Ga. Although the samples collected from different areas show obvious differences in geochemical composition, they commonly have high SiO2, Na2O+K2O and Zr contents, high 10 000Ga/Al values, and high zircon saturation temperatures, indicating that their protoliths have an affinity to A-type granite. Together with published data in literatures, protoliths of the mid-Paleoproterozoic granitic gneisses from the Jiaobei terrane were formed at two major stages: 2.13~2.10 Ga and 2.19~2.17 Ga. By comparison with the earlier stage granitic gneisses (2.19~2.17 Ga), the later stage granitic gneisses (2.13~2.10 Ga) show higher Zr contents and zircon saturation temperatures, and relatively higher zircon εHf(t) values. We concluded that protoliths of the 2.19~2.17 Ga granitic gneisses were formed by high-temperature dehydration melting of ~2.7 Ga and ~2.9 Ga TTG in the Jiaobei terrane, whereas protoliths of the 2.13~2.10 Ga granitic gneisses originated from partial melting of ~2.5 Ga TTG in the Jiaobei terrane at higher temperature. The differences in magma source and melting temperature of the protoliths of the two stages granitic gneisses imply that the Jiaobei terrane underwent two separate extensional tectonic events during the mid-Paleoproterozoic.

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谢士稳,王舫,刘倩,2022,胶北地体古元古代中期花岗片麻岩的成因和构造意义——SHRIMP锆石U-Pb年龄和全岩地球化学约束[J].岩石矿物学杂志,41(2):371~395. XIE Shi-wen, WANG Fang, LIU Qian,2022,Petrogenesis and tectonic significance of mid-Paleoproterozoic granitic gneisses in the Jiaobei terrane, North China Craton:Constraints from SHRIMP zircon U-Pb dating and whole-rock geochemistry[J]. Acta Petrologica et Mineralogica,41(2):371~395.

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  • 收稿日期:2021-11-27
  • 最后修改日期:2022-01-19
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  • 在线发布日期: 2022-03-21
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