Late Palaeozoic–Mesozoic volcano‐sedimentary rocks within the Rushan–Pshart Suture zone in the Pamir contain critical information on the subduction–accretion history of the Rushan–Pshart Ocean (Meso‐Tethys) prior to the Central–South Pamir collision. In this article, we report new field, petrographic, geochronological, and geochemical data of the Permian to Triassic basic volcanic and sedimentary rocks from the Pshart area. Our field study unravels block‐in‐matrix components within some sedimentary mélanges, which, together with some previously defined ophiolitic mélanges, enables us to define the Pshart accretionary complex (AC), and thus for the first time to discuss the subduction–accretion history of the Rushan–Pshart Ocean and the growth of the Pshart AC. The youngest detrital U–Pb zircons suggest that deposition of sediments was in the Late Triassic (212 Ma). Detritus of Triassic age was primarily derived from the Triassic Karakul‐Mazar Arc‐AC (Northern Pamir) and the Bashgumbaz Magmatic Arc, which developed along the northern margin of South Pamir. The evidence of north‐directed thrusts along the Kara Djilga‐2 and Ken Djilga transverses confirms previous interpretations of southward subduction of the Rushan–Pshart oceanic lithosphere beneath the South Pamir. Geochemical OIB‐type data of the Pshart alkaline basaltic rocks suggest formation in seamounts incorporated into the Pshart AC during the southward subduction of the Rushan–Pshart Ocean. The youngest Late Triassic deposition age is consistent with the coeval time of closure of the Palaeo‐Tethys and Meso‐Tethys oceans in the Pamir. The Pshart AC formed by subduction–accretion processes during the southward subduction of the Meso‐Tethys Ocean along the northern South Pamir and the final docking of the Central and South Pamir (Cimmerian Blocks) may have occurred after the Late Triassic.

中文翻译：

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晚古生代至晚三叠世北增生和南帕米尔北部海山的整合：从普沙特增生复合体的解剖学中获得的见解

帕米尔高原乳山-普沙特缝合带内的晚古生代-中生代火山-沉积岩包含有关中南帕米尔碰撞之前乳山-普沙特海洋（中特提斯）俯冲-增生历史的重要信息。在本文中，我们报告了P​​shart地区二叠纪至三叠纪基本火山岩和沉积岩的新油田，岩石学，地质年代和地球化学数据。我们的野外研究揭示了一些沉积混杂岩中的块状基质成分，再加上一些先前定义的脂橄榄质混杂岩，使我们能够定义Pshart增生复合物（AC），从而首次讨论了俯冲-增生历史乳山-普沙特海洋的变化和普沙特AC的增长。最年轻的碎屑铀锆石表明沉积物沉积在晚三叠世（212 Ma）。三叠纪时代的碎屑主要来自三叠纪的Karakul-Mazar Arc-AC（北帕米尔）和Bashgumbaz岩浆弧，它们沿着南帕米尔北部边缘发育。沿着卡拉吉尔加2号和肯吉尔加横向的北向逆冲的证据证实了先前对帕米尔南下Rushan-Pshart海洋岩石圈向南俯冲的解释。Pshart碱性玄武岩的地球化学OIB型数据表明，在乳山-Pshart海洋向南俯冲过程中，形成Pshart AC的海山形成。最晚的三叠纪沉积年龄与帕米尔古特提斯和中特提斯洋的封闭时期相吻合。