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首页> 外文期刊>International Journal of Earth Sciences >End-Permian to mid-Triassic termination of the accretionary processes of the southern Altaids: implications for the geodynamic evolution, Phanerozoic continental growth, and metallogeny of Central Asia
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End-Permian to mid-Triassic termination of the accretionary processes of the southern Altaids: implications for the geodynamic evolution, Phanerozoic continental growth, and metallogeny of Central Asia

机译：二叠纪末期至三叠纪中期终止阿尔泰山脉的增生过程：对地球动力学演化，生代大陆生长和中亚成矿作用的影响

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摘要

The Altaids is one of the largest accretionary orogenic collages in the world with the highest rate of Phanerozoic continental growth and significant metallogenic importance. It is widely accepted that subduction-related orogenesis of the Altaids started in the late Precambrian and gradually migrated southward (present coordinates). However, it is uncertain when and how the building of the Altaids was finally completed. Based on structural geology, geo-chemical, geochronological, and paleomagnetic data, this paper presents late Paleozoic to early Mesozoic accretionary tectonics of two key areas, North Xinjiang in the west and Inner Mongolia in the east, together with neighboring Mongolia. The late Paleozoic tectonics of North Xinjiang and adjacent areas were characterized by continuous southward accretion along the wide southern active margin ofrnSiberia and its final amalgamation with the passive margin of Tarim, which may have lasted to the end-Permian to early/ mid-Triassic. In contrast, in Inner Mongolia and adjacent areas two wide accretionary wedges developed along the southern active margin of Siberia and the northern active margin of the North China craton, which may have lasted to the mid-Triassic. The final products of the long-lived accretionary processes in the southern Altaids include late Paleozoic to Permian arcs, late Paleozoic to mid-Triassic accretionary wedges composed of radiolarian cherts, pillow lavas, and ophiolitic fragments, and high-pressure/ultrahigh-pressure metamorphic rocks. Permian Alaskan-type zoned mafic-ultramafic complexes intruded along some major faults of the Tien Shan. We define a new Tarim suture zone immediately north of the Tarim craton that is probably now buried below the Tien Shan as a result of northward sub-duction of the Tarim block in the Cenozoic. The docking of the Tarim and North China cratons against the southern active margin of Siberia in the end-Permian to mid-Triassic resulted in the final closure of the Paleoasian Ocean and terminated the accretionary orogenesis of the southern Altaids in this part of Central Asia. This complex geodynamic evolution led to formation of giant metal deposits in Central Asia and to substantial continental growth.
机译：阿尔泰山脉是世界上最大的增生造山拼贴之一，其生代大陆生长速率最高，成矿重要性也很高。俯冲相关的阿尔泰山脉造山运动始于前寒武纪，并逐渐向南迁移（目前的坐标），这一点已被广泛接受。但是，尚不确定何时以及如何完成阿尔泰人的建造。基于构造地质，地球化学，年代学和古地磁数据，本文介绍了西部两个北部，北部的新疆和东部的内蒙古以及两个邻区的晚古生代至早中生代增生构造。北新疆及邻近地区的晚古生代构造特征是沿着宽阔的南西伯利亚活动边缘连续向南增生，最后与塔里木的被动边缘合并，这可能一直持续到二叠纪末期至三叠纪早期/中期。相比之下，在内蒙古及邻近地区，沿着西伯利亚的南部活动边缘和华北克拉通的北部活动边缘形成了两个宽的增生楔，它们可能一直持续到三叠纪中期。阿尔泰山脉南部长时期增生过程的最终产物包括晚古生代至二叠纪弧期，晚古生代至三叠纪中期增生楔形物，其由放射cher石的cher石，枕状熔岩和砾石碎屑组成，以及高压/超高压变质作用岩石。沿天山的一些主要断层侵入了二叠系阿拉斯加型带状铁质-超镁铁质复合体。我们在塔里木克拉通以北定义了一个新的塔里木缝合带，该区域可能由于新生代塔里木块向北俯冲的结果而被埋在天山下。在二叠纪末期至三叠纪中，塔里木和华北克拉通与西伯利亚南部活跃边缘对接，导致古洋最终封闭，并终止了中亚这一地区南部阿尔泰山脉的增生造山作用。这种复杂的地球动力学演变导致在中亚形成了巨大的金属矿床，并导致了大陆的大量增长。

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  • 来源
    《International Journal of Earth Sciences》 |2009年第6期|1189-1217|共29页
  • 作者

    W. J. Xiao; B. F. Windley; B. C. Huang; C. M. Han; C. Yuan; H. L. Chen; M. Sun; S. Sun; J. L. Li;

  • 作者单位

    State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences, 100029 Beijing, China;

    Department of Geology, University of Leicester,Leicester LE1 7RH, UK;

    State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences, 100029 Beijing, China;

    State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences, 100029 Beijing, China;

    Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,510640 Guangzhou, China;

    School of Earth Sciences, Zhejiang University,310027 Hangzhou, China;

    Department of Earth Sciences,The University of Hong Kong, Hong Kong, China;

    State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences, 100029 Beijing, China;

    State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences, 100029 Beijing, China;

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  • 正文语种 eng
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  • 关键词

    end-permian to mid-triassic termination; accretionary process; southern altaids; geodynamic evolution; continental growth; metallogeny; central Asia;

    机译：二叠纪末至三叠世中期;增生过程;阿尔泰南部地球动力学演化大陆增长;成矿中亚;

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