文献类型：期刊文献

英文题名：Formation and Deformation of a Short-Lived and Immature Continental Back-Arc Basin in Southeastern Tibet

作者：Xin, Di Yang, Tian-Nan Xue, Chuan-Dong Jiang, Li-Li Xiang, Kun

第一作者：Xin, Di

通信作者：Xin, D[1];Yang, TN[1];Yang, TN[2]

机构：[1]Chinese Acad Geol Sci, Inst Geol, Beijing, Peoples R China;[2]Chinese Acad Geol Sci, Inst Geol, State Key Lab Deep Earth & Mineral Explorat, Beijing, Peoples R China;[3]Kunming Univ Sci & Technol, Dept Geosci, Kunming, Peoples R China;[4]China Geol Survey, Chengdu Ctr, Chengdu, Peoples R China;[5]Guizhou Inst Technol, Sch Resources & Environm Engn, Guiyang, Peoples R China

第一机构：Chinese Acad Geol Sci, Inst Geol, Beijing, Peoples R China

通信机构：corresponding author), Chinese Acad Geol Sci, Inst Geol, Beijing, Peoples R China;corresponding author), Chinese Acad Geol Sci, Inst Geol, State Key Lab Deep Earth & Mineral Explorat, Beijing, Peoples R China.

年份：2026

卷号：27

期号：4

外文期刊名：GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS

收录：;EI(收录号：20261720562300);Scopus(收录号：2-s2.0-105036310396);WOS:【SCI-EXPANDED(收录号:WOS:001743889900001)】；

基金：This paper is supported by the Ministry of Sciences and Technology of China (2022YFF0800901) and the National Natural Science Foundation of China (No. 42202250). Discussion with Prof. Zhen Yan, constructive comments and suggestions from Professor Wenjiao Xiao, Danping Yan and two anonymous reviewers on an earlier version helped to improve the manuscript. The journal editor (Professor Paul D. Asimow) and two anonymous reviewers provided valuable comments and suggestions that greatly improved this paper.

语种：英文

外文关键词：Paleo-Tethyan; back-arc basin; basin deformation; Southeastern Tibet

摘要：Comprehension of the ophiolitic m & eacute;lange plays a key role in the tectonic reconstruction of an ancient orogenic belt in terms of plate tectonics. The tectonic nature of the NNW-trending southern Jinshajiang ophiolitic m & eacute;lange is still controversial. This study reports the results of a field study and new geochronological and geochemical data that enable the identification of the Zhongdian continental back-arc basin. The basin was filled with a flysch succession and at least two horizons of pillow basalt from 267 to 254 Ma. The inversion of the back-arc basin was completed in a short period of one million years (254-253 Ma), which has led to the development of overturned folds of the flysch succession and a latest Permian to Early Triassic back-arc foreland basin in front of the folded belt. The formation and inversion of the Zhongdian back-arc basin is suggested to have been caused by rollback and subsequent break-off of the subducted oceanic slab. During the inversion, the crust shortening occurred predominantly in the back-arc basin, while the weakly deformed southwestern shoulder of the back-arc basin has been shifted north-eastward for similar to 30 km. The formation process of the Zhongdian back-arc basin is comparable to that of a typical continental rift system, the asymmetric architecture of which has mostly been inherited by the structures formed during the basin inversion. The short-lived Zhongdian back-arc basin likely marks the southernmost, immature termination of the southern Jinshajiang Ocean.