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首页> 外文期刊>Journal of Asian earth sciences >The Alashan Terrane did not amalgamate with North China block by the Late Permian: Evidence from Carboniferous and Permian paleomagnetic results
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The Alashan Terrane did not amalgamate with North China block by the Late Permian: Evidence from Carboniferous and Permian paleomagnetic results

机译：阿拉善地体并未与二叠纪晚期的华北地块融合：石炭纪和二叠纪古磁结果的证据

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摘要

Rock magnetic and paleomagnetic studies have been carried out on the early Carboniferous limestones and the Late Permian purple sandstones sampled in the eastern Alashan Terrane (ALT), northwest of China. Two components were isolated from the Early Carboniferous limestone by thermal progressive demagnetisation: a low unblocking temperature component (LTC) of recent origin; a pre-folding medium temperature component (MTC) (the paleomagnetic pole is lambda = 13.1 degrees N, Phi = 11.0 degrees E, A(95) = 7.0 degrees) that is probably the result of the hydrothermal fluids from the Qilian Orgenic Belt acquired during the Late Carboniferous-Early Permian. Also, two components were separated from the Late Permian purple sandstone by thermal progressive demagnetisation: the LTC with the recent viscous remanent magnetisation, and the higher temperature component (HTC) revealed from three sections which has passed a regional fold test at the 95% probability level and reversal test, suggesting a primary characteristic magnetisation. The corresponding paleomagnetic pole is lambda = 27.2 degrees N, Phi = 18.8 degrees E, A(95) = 12.0 degrees. The apparent polar wander path (including early Carboniferous, late Carboniferous-Early Permian, Late Permian and Early-middle Triassic poles) of the ALT is significantly different with those of the NCB. Comparison of the APWPs between the ALT and NCB shows a strong similarity. If the APWP of Hexi Corridor-Alashan rotated counterclockwise around an Euler pole at 44 degrees N, 84 degrees E by 32 degrees, then the coeval APW path of the ALT overlaps to that of the NCB. This result indicates that the ALT migrated to the NCB after the Early-Middle Triassic along a tectonic boundary located between Helanshan Mountain and Zhuozishan Mountain, and finally amalgamated to the NCB before the Early Cretaceous. (C) 2014 Elsevier Ltd. All rights reserved.
机译：已经在中国西北部东部阿拉善地带（ALT）采样的早期石炭系石灰岩和二叠纪晚期紫色砂岩上进行了岩石磁性和古磁性研究。通过热渐进退磁从早期石炭纪石灰石中分离出两个成分：一个是最近起源的低解块温度成分（LTC）；另一个是热解磁。折叠前的中温分量（MTC）（古磁极为lambda = 13.1度，Phi = 11.0度E，A（95）= 7.0度），可能是从祁连造山带获得的热液造成的在石炭纪-早二叠纪晚期。此外，通过热渐进退磁将两个成分从晚二叠世紫色砂岩中分离出来：具有最近粘性剩余磁化强度的LTC，以及三个区域显示的较高温度成分（HTC），这些成分以95％的概率通过了区域褶皱测试电平和反转测试，表明主要特征磁化强度。相应的古磁极为lambda = 27.2度N，Phi = 18.8度E，A（95）= 12.0度。 ALT的表观极地游走路径（包括早期石炭纪，晚期石炭纪-早二叠纪，晚期二叠纪和三叠纪中中期）与NCB明显不同。 ALT和NCB之间APWP的比较显示出很强的相似性。如果河西走廊-阿拉山的APWP绕着Euler极逆时针旋转，北移44度，东经84度，旋转32度，那么ALT的同代APW路径与NCB的同侧APW路径重叠。该结果表明，ALT在中三叠世之后沿着贺兰山与卓子山之间的构造边界向NCB迁移，并最终在白垩纪前合并为NCB。 （C）2014 Elsevier Ltd.保留所有权利。

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  • 来源
    《Journal of Asian earth sciences》 |2015年第15期|145-159|共15页
  • 作者

    Yuan Wei; Yang Zhenyu;

  • 作者单位

    Nanjing Univ, Sch Earth Sci & Engn, Nanjing 210093, Jiangsu, Peoples R China|SINOPEC, Wuxi Res Inst Petr Geol, Wuxi 214726, Jiangsu, Peoples R China;

    Minist Land & Resource, Key Lab Paleomagnetism & Tecton Reconstruct, Beijing 100081, Peoples R China|Chinese Acad Geol Sci, Inst Geomech, Beijing 100081, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Carboniferous; Permian; Paleaomagnetic; Alashan Terrane; North China block;

    机译：石炭系;二叠系;古磁性;阿拉善地带;华北地块;

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