首页|Quaternary integrative stratigraphy,biotas,and paleogeographical evolution of the Qinghai-Tibetan Plateau and its surrounding areas

Quaternary integrative stratigraphy,biotas,and paleogeographical evolution of the Qinghai-Tibetan Plateau and its surrounding areas

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The Quaternary strata on the Qinghai-Tibet Plateau contain rich information about the paleoclimate and environ-mental evolution,record the evolution process of the Quaternary regional tectonics,paleogeography,and geomorphology of the plateau,and are extremely important areas for studying the Quaternary geological events and regional environmental evolution.According to a comprehensive analysis of the regional stratigraphic data and the development and evolution characteristics of the biota,based on the differences in the lithostratigraphic units,sedimentary characteristics,landforms,and drainage systems,the Quaternary strata on the Qinghai-Tibet Plateau and its surrounding areas are divided into five stratigraphic regions:the Tarim region,Loess Plateau region,Qinghai-Tibet Plateau region,Yunnan-Guizhou Plateau region,and India-Ganges region.The Qinghai-Tibet Plateau stratigraphic region is divided into seven stratigraphic sub-regions:the West Kunlun-Karakorum,Altun-Qilian Mountains,Qaidam-Hehuang,East Kunlun-Bayan Har,Qiangtang,East Xizang-West Yunnan-West Sichuan,and Gangdise-Himalayan sub-regions.This paper briefly describes the lithostratigraphic units of the seven stratigraphic sub-regions of the Qinghai-Tibet Plateau.According to the lithostratigraphic sequence and its sedimentary characteristics,stratigraphic contact relationship,formation age,and evolution of the biota in each stratigraphic sub-region,the Quaternary tectonic paleo-geographic evolution of the Qinghai-Tibet Plateau is divided into four stages.(1)The inherited differential uplift stage since the Pliocene(2.6-1.8/1.5 Ma):the regional sedimentary differences were significant,and the stratigraphic distribution was limited,the alluvial-proluvial sandy conglomerate was widely developed along the piedmont,and fluvial and lacustrine deposits were developed in the low-lying areas between the mountains.(2)The mountain range flattening stage(1.8/1.5-1.2/0.8 Ma):the erosion unconformity surfaces around the plateau were widely distributed,large rivers were formed,and lake sediments de-veloped in the intermountain basins and the hinterland of the plateau.(3)1.2/0.8-0.128 Ma:the plateau continued to rise in a large range,with significant topographic differences and intensified mountain erosion.At about 0.8 Ma,the plateau uplifted above the snow line and entered the cryosphere,mountain glaciers developed,and the alpine arid environment gradually formed.(4)0.128 Ma-:the mountains rose and erosion intensified,and intermountain basins and lakes were widely distributed.There were significant differences in the regional sedimentary characteristics,and the sedimentary types developed toward diversifi-cation.The modern plateau landform pattern was basically formed.

Qinghai-Tibet PlateauQuaternaryStratigraphic correlationBiotaPaleogeography

Yong WANG、Mianping ZHENG、Yuan LING、Shuyuan XIANG、Zhaogang SHAO、Kexin ZHANG、Xue KE、Xiao LIN、Fang HAN、Jian'en HAN

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Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China

Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China

Faculty of Earth Sciences,China University of Geosciences,Wuhan 430074,China

Chinese Academy of Geological Sciences,Beijing 100037,China

Institute of Geological Survey,China University of Geosciences,Wuhan 430074,China

School of Earth Sciences,East China University of Technology,Nanchang 330013,China

Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081,China

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China Geological SurveyChina Geological SurveyChina Geological Survey国家自然科学基金

DD20221645DD20221648DD2019037091962219

2024

10.1007/s11430-023-1214-7

中国科学:地球科学(英文版)
中国科学院

中国科学:地球科学(英文版)

影响因子：1.002
ISSN：1674-7313
年,卷(期)：2024.67(4)
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