The Late Cretaceous source-to-sink system at the eastern margin of the Tibetan Plateau: Insights from the provenance of the Lanping Basin

被引:17
|
作者
Wang, Licheng [1 ]
Shen, Lijian [2 ]
Liu, Chenglin [2 ]
Chen, Ke [3 ]
Ding, Lin [1 ]
Wang, Chengshan [4 ]
机构
[1] Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing 100101, Peoples R China
[2] Chinese Acad Geol Sci, Inst Mineral Resources, MNR Key Lab Metallogeny & Mineral Assessment, Beijing 100037, Peoples R China
[3] Yunnan Geol Survey, Kunming 650051, Yunnan, Peoples R China
[4] China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China
基金
中国国家自然科学基金;
关键词
Detrital Zircons; Drainage; Late Cretaceous; Source-to-sink; Lacustrine Basin; Tibetan Plateau; ZIRCON U-PB; GARZE FOLD BELT; PALEOZOIC SEDIMENTARY-ROCKS; SOUTHERN LANCANGJIANG ZONE; ARC/BACK-ARC ASSEMBLAGES; SW CHINA IMPLICATIONS; DETRITAL ZIRCON; TECTONIC EVOLUTION; HF ISOTOPE; WESTERN YUNNAN;
D O I
10.1016/j.gsf.2020.11.002
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
The surface uplift of the Tibetan Plateau (TP) and its geomorphology evolution has triggered aridification of Asia's interior and drainage development at the eastern margin of the plateau. However, how the pre-Cenozoic early growth histories of the TP impact the drainage system and climate is poorly constrained. The Late Mesozoic Lacustrine evaporite-bearing basins on the eastern margin of the TP record significant information on the uplift of the source terranes, source-to-sink system development and climate change. In this study, we presented detrital zircon U-Pb ages from the Upper Cretaceous Yunlong Formation in the Lanping Basin, as well as Hf isotopic, petrographic, direct statistical, and multidimensional scaling analyses, and use them to characterize the provenance and reconstruct the drainage system. All of the samples have five major age peaks at 200-290 Ma, 400-490 Ma, 750-1000 Ma, 1750-1950 Ma, and 2400-2600 Ma with mostly negative epsilon(Hf)(t) values (81%). We infer the sediments are primarily derived from recycled sediments of the Songpan-Garze terrane, and partly from the Sichuan Basin and the Southern Qiangtang terrane, aswell as the exposed magmatic rocks of the Yidun Arc and Songpan-Garze terrane. The provenance features of the contemporaneous sediments from the Sichuan, Xichang, Chuxiong, and Simao basins indicate a complex hierarchical drainage pattern on the eastern margin of the TP during the Late Cretaceous. The hierarchical drainage system exhibits a complete gradational cycle of lake-basin types from overfilled freshwater Sichuan Basin through balanced fill saline Xichang Basin and underfilled hypersaline Chuxiong, Lanping, Simao, and Khorat Plateau basins from proximal to distal. The early growth of the TP primarily controlled the drainage and lake-basin evolution by not only causing the uplift and exhumation of the source areas and providing large amounts of clastic material to the proximal sub-drainage areas but also intensifying the aridity and deposition of evaporites. (C) 2021 ChinaUniversity of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V.
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页数:17
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