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DOI	10.1016/j.palaeo.2020.109651
	Evolution of the paleo-Mekong River in the Early Cretaceous: Insights from the provenance of sandstones in the Vientiane Basin, central Laos
	Wang, Licheng; Shen, Lijian; Liu, Chenglin; Ding, Lin
通讯作者	Wang, LC (通讯作者)
发表日期	2020
ISSN	0031-0182
EISSN	1872-616X
卷号	545
英文摘要	The Cenozoic was a time of rapid change in the large river systems of the southeastern Tibetan Plateau. Many previous studies proposed a connection between the upper reaches of the Salween, Mekong, Jinsha (Upper Yangtze) Rivers and paleo-Red River which then flowed to the South China Sea. However, little is known about the pre-Cenozoic source-to-sink river pathways of the Tibetan Plateau. Using 848 detrital zircon U-Pb ages derived from the Lower Cretaceous samples located in the Vientiane Basin, combined with petrographic, statistical, and Multidimensional Scaling (MDS) analyses, we present a detailed history of the paleo-Mekong River. All samples can be divided into three groups based on their age distribution. Samples in Group 1 from the lower part of section show major peaks in the Wutai (2400-2600 Ma), Luliangian (1700-1900 Ma), Jinningian (750-1000 Ma), Indosinian (200-290 Ma), and Yanshanian (150-200 Ma) periods, and are mainly sourced from the Southern Qiangtang terrane. These samples bear no resemblance to modern river sands in the MDS diagram. As such, we infer that these samples represent a unique paleo-river course from the Southern Qiangtang terrane. Samples in Groups 2-3 at the middle and upper part of section yield age peaks at the Luliangian, Jinningian, Caledonian (400-490 Ma), Indosinian, and Yanshanian periods, and are sourced from the Sichuan Basin, Songpan-Garze and the Northern Qiangtang terranes, which have characteristics similar to those of the modern Mekong River and Jinsha River. In our paleo-drainage model, the upper reach of the paleo-Mekong River did not connect to the Upper Salween River and flow into the Red River during the early Early Cretaceous period, as has been proposed previously. In the late Early Cretaceous, the upper segment of the paleo-Mekong River, which drained from the Sichuan Basin and Songpan-Garze terrane, and the upper reach of the Jinsha River were tributaries of a single Mekong River before collecting in the Vientiane and Khorat Plateau basins. These provenance and drainage changes (or lack thereof) were driven by the collision between the Lhasa and Qiangtang terranes similar to 120 Ma and the subsequent uplift and denudation of the Northern Qiangtang and Songpan-Garze terranes.
关键词	ZIRCON U-PB WHOLE-ROCK GEOCHEMISTRY SW CHINA IMPLICATIONS HF ISOTOPE DATA TECTONIC EVOLUTION DETRITAL ZIRCONS LHASA TERRANE INDO-CHINA YANGTZE BLOCK SOUTH CHINA
英文关键词	Detrital zircon; Geochronology; Drainage system; Source to sink; River evolution; Tibetan Plateau
语种	英语
WOS研究方向	Physical Geography ; Geology ; Paleontology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS记录号	WOS:000526825900011
来源期刊	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259695
推荐引用方式 GB/T 7714	Wang, Licheng,Shen, Lijian,Liu, Chenglin,et al. Evolution of the paleo-Mekong River in the Early Cretaceous: Insights from the provenance of sandstones in the Vientiane Basin, central Laos[J]. 中国科学院青藏高原研究所,2020,545.
APA	Wang, Licheng,Shen, Lijian,Liu, Chenglin,&Ding, Lin.(2020).Evolution of the paleo-Mekong River in the Early Cretaceous: Insights from the provenance of sandstones in the Vientiane Basin, central Laos.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,545.
MLA	Wang, Licheng,et al."Evolution of the paleo-Mekong River in the Early Cretaceous: Insights from the provenance of sandstones in the Vientiane Basin, central Laos".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 545(2020).