Evolution of the Sumdo Paleo-Tethyan Ocean: Constraints from Permian Luobadui Formation in Lhasa terrane, South Tibet
Evolution of the Sumdo Paleo-Tethyan Ocean: Constraints from Permian Luobadui Formation in Lhasa terrane, South Tibet
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松多古特提斯洋演化：藏南拉萨地体二叠系罗巴堆组的制约
DOI：
10.1016/j.palaeo.2022.110974
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发表时间：
2022-04
期刊：
影响因子：
--
通讯作者：
Yue Ya-Hui
中科院分区：
文献类型：
--
作者：
Wang Chao;Ding Lin;Cai Fu-Long;Wang Hou-Qi;Zhang Li-Yun;Yue Ya-Hui
重建松多古特提斯洋（SPTO）的演化对于理解古特提斯体系向新特提斯体系的转变具有重要意义。 SPTO的存在是根据分隔拉萨南部和拉萨北部地体的（超）高压变质带和破碎的蛇绿岩体的存在推断的。本文介绍了拉萨地体洛巴堆组的新地质年代学和地球化学数据。下洛巴堆火山岩和上洛巴堆火山岩之间的地球化学差异表明源区从贫乏地幔源区向富集地幔源区转变，这表明大陆弧俯冲作用。综合地质证据表明，SPTO 最初在石炭纪晚期（约 304 Ma）打开，这已被洋壳的最早记录所证实。我们关于洛巴堆火山岩的新数据，连同变质和沉积记录，支持拉萨北部下方 SPTO 岩石圈向北俯冲，最有可能开始于早二叠世（约 275 Ma），一直持续到中二叠世（约 260 Ma）。根据中压变质作用和同碰撞岩浆作用的记录，SPTO 的主要闭合发生在中晚三叠世（约 240-220 Ma）期间。 SPTO 的威尔逊循环由此被重建，为青藏高原的合并提供了重要的见解。
Reconstructing the evolution of the Sumdo Paleo-Tethyan Ocean (SPTO) is important for understanding the transition from the Paleo-Tethyan system to the Neo-Tethyan system. The existence of the SPTO is inferred from the presence of an (ultra-)high pressure metamorphic belt and dismembered ophiolite bodies that separate the southern Lhasa and northern Lhasa terrane. This paper presents new geochronological and geochemical data for the Luobadui Formation in the Lhasa terrane. The geochemical difference between the Lower Luobadui volcanics and the Upper Luobadui volcanics suggests a source transition from a depleted mantle source to an enriched mantle source, which indicates continental-arc subduction. The integrated geological evidence suggests that the SPTO initially opened during the late Carboniferous (ca. 304 Ma), as verified by the earliest record of oceanic crust. Our new data for the Luobadui volcanic rocks, together with the metamorphic and sedimentary records, support northward subduction of the SPTO lithosphere beneath North Lhasa, most likely starting during the Early Permian (ca. 275 Ma) and lasting until the Middle Permian (ca. 260 Ma). The main closure of the SPTO occurred during Middle–Late Triassic (ca. 240–220 Ma), as recorded by medium-pressure metamorphism andsyn-collisional magmatism. The Wilson cycle of the SPTO is hereby reconstructed, providing significant insights into the amalgamation of the Tibetan Plateau.
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