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首页> 外文期刊>Journal of Asian earth sciences >From rift to drift in South Pamir (Tajikistan): Permian evolution of a Cimmerian terrane
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From rift to drift in South Pamir (Tajikistan): Permian evolution of a Cimmerian terrane

机译：从南帕米尔（塔吉克斯坦）的裂谷到漂泊：Cimmerian地体的二叠纪演化

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摘要

Here, we describe the Permian-Lower Triassic sedimentary succession of South Pamir and the associated biota of conodonts, foraminifers and brachiopods. The studied succession comprises the Carboniferous-Lower Permian siliciclastic Uruzbulak and Tashkazyk formations (Bazar Dara Group), which are unconformably covered by upper Lower to Upper Permian units, deposited both in platform settings (Kurteke Formation), and on the slope and basin (Kochusu Formation, Shindy Formation, Kubergandy Formation, Can Formation, and Takhtabulak Formation). These formations comprise bioclastic limestones, cherty limestones, shales, volcaniclastic rocks, basalts, sandstones and conglomerates, and are locally very rich in fossils (fusulinids, ammonoids, brachiopods, corals and conodonts). The Permian succession is then overlain by shallow water carbonates of the Induan to Anisian Karatash Group. Subsidence analysis and volcanics of the Permian and overlying Triassic successions constrains the timing of rifting of South Pamir from Gondwana in the Early Permian (=Cisuralian), and its docking to Central Pamir, the Eurasian margin and the interposed volcanic arcs at the end of the Triassic. The sedimentary successions of the Pamirs represent a key-point to refine the correlations between the Tethyan regional scale and the International Time Scale. The analyses of the fusulinids and conodonts of the Kubergandian and Murgabian stratotypes of SE Pamir suggest that: (1) the upper Bolorian and the lower part of the Kubergandian correlate to the upper Kungurian; (2) the upper Kubergandian and the lower Murgabian correlate to the Roadian; (3) the mid-upper Murgabian correlates to the Wordian; (4) possibly the uppermost Murgabian and the lower Midian correlate to the lower Capitanian.
机译：在这里，我们描述了南帕米尔的二叠纪-下三叠纪沉积演替以及牙形石，有孔虫和腕足动物的相关生物群。所研究的演替包括石炭纪-下二叠统硅质碎屑乌鲁兹布拉克和塔什卡日克地层（巴扎尔达拉群），这些地层不均匀地被上，下二叠系到上二叠统单元覆盖，既沉积在平台环境中（库尔特克组），又沉积在斜坡和盆地上（科楚苏）地层，发亮地层，Kubergandy地层，Can地层和Takhtabulak地层）。这些地层包括生物碎屑灰岩，钙质石灰石，页岩，火山碎屑岩，玄武岩，砂岩和砾岩，并且在当地富含化石（岩藻类，铵盐，腕足类，珊瑚和牙形石）。然后，二叠纪演替被印支至阿尼西亚卡拉塔什群的浅水碳酸盐覆盖。二叠纪及其上覆的三叠纪演替的沉陷分析和火山活动限制了南帕米尔从早二叠世的冈瓦纳（Cisuralian）裂陷的时间，以及它与帕米尔中部的对接，欧亚大陆边缘和末尾插入的火山弧的约束。三叠纪。帕米尔高原的沉积演替是完善特提斯地区尺度与国际时间尺度之间相关性的关键。对SE Pamir的Kubergandian和Murgabian层型的融合体和牙形体的分析表明：（1）上博洛里安山脉和Kubergandian下部与上昆古里亚山脉相关； （2）Kubergandian上部和Murgabian下部与Roadian相关。 （3）中上层的穆加比亚人与Wordian相关； （4）可能最上层的Murgabian和下层Midian与下层Capitanian相关。

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