文献类型：期刊文献

英文题名：Early Late Triassic retro-foreland basin in response to flat subduction of the Paleo-Tethyan oceanic plate, SE Tibet

作者：Liang, Mingjuan Yang, Tiannan Yan, Zhen Xue, Chuandong Xin, Di Qi, Shaofeng Dong, Mengmeng Wang, Wei Shi, Pengliang Xiang, Kun Han, Xue Bao, Jingkun

第一作者：Liang, Mingjuan

通信作者：Yang, TN[1]

机构：[1]Geol Museum Guizhou, Guiyang, Peoples R China;[2]Chinese Acad Geol Sci, Inst Geol, Beijing, Peoples R China;[3]Kunming Univ Sci & Technol, Dept Earth Sci, Kunming, Peoples R China;[4]Beijing Jinyou Geol Explorat Co Ltd, Beijing, Peoples R China;[5]Guizhou Inst Technol, Sch Resources & Environm Engn, Guiyang, Peoples R China;[6]Guizhou Geol Survey, Guiyang, Peoples R China

第一机构：Geol Museum Guizhou, Guiyang, Peoples R China

通信机构：corresponding author), Chinese Acad Geol Sci, Inst Geol, Beijing, Peoples R China.

年份：2022

卷号：10

外文期刊名：FRONTIERS IN EARTH SCIENCE

收录：;Scopus(收录号：2-s2.0-85139186807);WOS:【SCI-EXPANDED(收录号:WOS:000863999700001)】；

基金：This work was financially supported by the Natural Sciences Foundation of China (No. 92055206) and Ministry of Sciences and Technology of People's Republic of China (grant numbers 2016YFC0600306-4 and 2015CB452601).

语种：英文

外文关键词：sedimentary environment; early Late Triassic; retro-foreland basin; flat subduction; SE Tibet

摘要：Syn-subduction basins bear significant implications to understand tectonic evolution of any fossil subduction zone. The late Paleozoic to early Mesozoic (Paleo-Tethyan) tectonics of the eastern and southeastern Tibetan Plateau (i.e., the Sanjiang Orogenic Belt) is featured by ocean-continent subduction systems. A huge pile of volcanic-absent sedimentary succession developed in the middle segment of the Sanjiang orogenic belt, its age and tectonic nature remain unclear. Detailed geological mapping and zircon U-Pb dating results demonstrate that the early Late Triassic volcanic-absent succession comprises the nonmarine Maichuqing Formation in the lower part and the shallow marine Sanhedong Formation in the upper part. The Maichuqing Formation consists of coarse to fine-grained sandstone, siltstone and mudstone with abundant basal erosional surfaces, trough and planar cross-beddings, ripples, mudcracks, and plant fragments. The Sanhedong Formation comprises predominantly bioclastic limestones interlayered with marl, calcareous-muddy siltstone, and calcareous sandstone with abundant bivalve fossils. Syn-sedimentation deformation structures, such as slump folds and associated normal faults are common, suggesting intense tectonism during deposition. Synthesizing sedimentary data, paleocurrent and provenance results, combined with other available data, demonstrate that the volcanic-absent succession deposited within a retro-foreland basin along the rear part of the Permian-Triassic Jomda-Weixi-Yunxian arc in response to flat-subduction of the Paleo-Tethyan Ocean during the early Late Triassic time.