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首页> 外文期刊>Tectonophysics: International Journal of Geotectonics and the Geology and Physics of the Interior of the Earth >Detrital zircon provenance evidence for large-scale extrusion along the Altyn Tagh fault
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Detrital zircon provenance evidence for large-scale extrusion along the Altyn Tagh fault

机译：沿阿尔金塔格断裂的大规模挤压的碎屑锆石物证

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The question of whether or not the Altyn Tagh fault is a large-scale extrusion boundary is critical for understanding the role of lateral extrusion in accommodating the Indo-Asian convergence and in building the Tibetan Plateau. Oligocene conglomerate clasts in the eastern Xorkol basin are low-grade slate, phyllite, sandstone, dacite and carbonate, and associated paleocurrent indicators evince sediment derivation from the opposing side of the Altyn Tagh fault. Matching these clasts with similar basement rocks in the North Qilian and Tuolainanshan terranes requires post-Oligocene left-lateral offset of 380 +/- 60 km on the eastern segment of the Altyn Tagh fault, suggesting large-scale extrusion along the fault in the Cenozoic (Yue, Y.J., Ritts, B.D., Graham, S.A., 2001b. Initiation and long-term slip history of the Altyn Tagh fault. International Geological Review 43, 1087-1094.). In order to further define this piercing point, the detrital zircon pattern of Oligocene sandstone from the Xorkol basin and the zircon ages of basement on the southern side of the fault were established by ion microprobe dating. Characterized by strong peaks between 850 and 950 Ma and the absence of Paleozoic and Mesozoic ages, the detrital zircon age pattern of the Oligocene sandstone matches the age distribution of zircon-bearing rocks of the Tuolainanshan terrane. This match requires 360 +/- 40 km of post-Oligocene left-lateral displacement on the eastern segment of the Altyn Tagh fault, supporting as well as refining the previously reported lithology-based cross-fault match. At least one of the following three extrusion scenarios must have existed to accommodate this large offset: (1) northeastward extrusion along the Altyn Tagh-Alxa-East Mongolia fault, (2) eastward extrusion along the Altyn Tagh-North Qilian-Haiyuan fault, and (3) northeastward extrusion of northern Tibet as a Himalaya-scale thrust sheet along the North Qilian-Haiyuan fault. We prefer the first scenario inasmuch as rapidly growing evidence for Cenozoic strike-slip activity on the Alxa-East Mongolia fault and mid-Miocene exhumation of northern Tibet supports it. (c) 2005 Elsevier B.V. All rights reserved.
机译：Altyn Tagh断层是否为大规模挤压边界的问题对于理解横向挤压在适应印度-亚洲融合和建立青藏高原中的作用至关重要。 Xorkol盆地东部的渐新世砾岩碎屑岩为低品位板岩，千枚岩，砂岩，榴辉岩和碳酸盐岩，相关的古流指示符表明沉积物是从阿尔金塔格断裂的相对侧衍生而来的。要使这些碎屑与北祁连和托莱南山地层中类似的基底岩石相匹配，就需要在阿尔金塔格断裂东段的渐新世后左偏移380 +/- 60 km，这表明沿新生代断层大规模挤压（Yue，YJ，Ritts，BD，Graham，SA，2001b。AltynTagh断层的起因和长期滑动历史。InternationalGeological Review 43，1087-1094。）。为了进一步确定这个穿刺点，通过离子微探针测年建立了Xorkol盆地渐新世砂岩的碎屑锆石样式和断层南侧基底的锆石年龄。渐新世砂岩的碎屑锆石年龄特征以850 Ma至950 Ma的强峰以及不存在古生代和中生代年龄为特征，与拓荒南山地层中含锆石的年龄分布相匹配。该匹配需要在Altyn Tagh断层东段的渐新世后左移360 +/- 40 km，以支持并完善以前报道的基于岩性的跨断层匹配。必须存在以下三种挤压情景中的至少一种，以适应该较大偏移量：（1）沿阿尔金·塔格-阿尔克萨-东蒙古断裂带向东北挤压，（2）沿阿尔金·塔格-北祁连-海源断裂向东挤压， （3）沿北部祁连-海原断裂带以喜马拉雅规模的逆冲片状向北延伸。我们之所以选择第一种情况，是因为在阿拉善-东蒙古断层上新生代走滑活动的迅速增长的证据以及西藏北部中新世中期的发掘活动支持了这一情况。 （c）2005 Elsevier B.V.保留所有权利。

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