首页|Discovery of the Miocene Yuanmou Conglomerate and Its Significance for the Drainage Evolution in the Southeastern Tibetan Plateau

Discovery of the Miocene Yuanmou Conglomerate and Its Significance for the Drainage Evolution in the Southeastern Tibetan Plateau

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The active deforming southeastern margin of the Tibetan Plateau has developed series of fault basins filled with fluvial-lacustrine sediment deposited by drainage systems during every stage of its uplifting,the records of Cenozoic sedimentary sequence and detrital provenance in these basins are often obscure,making the interpretation of the drainage reorganization quite difficult.This research discovered the earliest Late Cenozoic fluvial conglomerate in the Yuanmou Basin,one of the fault ba-sins in SE Tibet,and named the conglomerate as'the Yuanmou Gravel Layer(YMG)'.Clast petrogra-phy,morphology and paleocurrent directions of the YMG indicate that the conglomerate is the remain of a large paleo river traversing through the Yuanmou Basin from north to south.Detrital zircon U-Pb ages can imply the YMG has similar provenance areas with Anning,Dadu and Yalong rivers at age peaks of 175-275,600-1 000,and 2 100-2 700 Ma,but the lack of the age peak of 30-100 Ma from Qiang-tang Block implies that the paleo-river was not yet connected with the Jinsha River during the YMG's accumulation.The fluvial-lacustrine strata with gravel beds containing paleosimian fossils comparable to the YMG were deposited～7-11 Ma,further suggesting that the pre-formed south-flowing river was active during the Late Miocene.

Yuanmou Gravel Layerwater drainage evolutionriversdetrital zircon U-Pb agessedimentationUpper Yangtze

Dai Zhang、Chang'an Li、Shitao Zhang、Honglin Yuan、Zengjie Zhang、Yawei Li

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School of Geography and Information Engineering,China University of Geosciences,Wuhan 430078,China

State Key Laboratory of Biogeology and Environmental Geology,Wuhan 430078,China

Faculty of Land Resources Engineering,Kunming University of Science and Technology,Kunming 650093,China

State Key Laboratory of Continental Dynamics,Northwest University,Xi'an 710069,China

School of Earth Sciences and Engineering,Sun Yat-Sen University,Zhuhai 519080,China

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2024

10.1007/s12583-023-1937-7

地球科学学刊(英文版)
中国地质大学

地球科学学刊(英文版)

CSTPCD
影响因子：0.724
ISSN：1674-487X
年,卷(期)：2024.35(6)