The early Eocene rise of the Gonjo Basin, SE Tibet: From low desert to high forest

被引：189

作者：

Xiong, Zhongyu ^{[1
,2
]}

Ding, Lin ^{[1
]}

Spicer, Robert A. ^{[3
,4
]}

Farnsworth, Alexander ^{[5
]}

Wang, Xu ^{[6
]}

Valdes, Paul J. ^{[5
]}

Su, Tao ^{[3
]}

Zhang, Qinghai ^{[1
]}

Zhang, Liyun ^{[1
]}

Cai, Fulong ^{[1
]}

Wang, Houqi ^{[1
]}

Li, Zhenyu ^{[1
]}

Song, Peiping ^{[1
]}

Guo, Xudong ^{[1
]}

Yue, Yahui ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing 100101, Peoples R China

[2] Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China

[3] Chinese Acad Sci, CAS Key Lab Trop Forest Ecol, Xishuangbanna Trop Bot Garden, Mengla 666303, Peoples R China

[4] Open Univ, Sch Environm Earth & Ecosyst Sci, Milton Keynes MK7 6AA, Bucks, England

[5] Univ Bristol, Sch Geog Sci, Univ Rd, Bristol BS8 1SS, Avon, England

[6] Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, Beijing 100101, Peoples R China

来源：

EARTH AND PLANETARY SCIENCE LETTERS | 2020年 / 543卷

基金：

中国国家自然科学基金; 英国自然环境研究理事会;

关键词：

SE Tibetan Plateau; clumped isotope; paleoelevation; Eocene; intracontinental subduction; QIANGTANG TERRANE; GEOLOGICAL EVOLUTION; STABLE-ISOTOPES; SOUTHERN TIBET; HIGH-ELEVATION; PLATEAU; PALEOCENE; CLIMATE; PALEOALTIMETRY; DELTA-O-18;

D O I：

10.1016/j.epsl.2020.116312

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

070403 [天体物理学]; 070902 [地球化学];

摘要：

Views differ on the uplift history of the SE Tibetan Plateau and causal geodynamic mechanisms, yet reliable age-constrained paleoaltimetry in this region could test growth models of the entire plateau. Here we apply carbonate clumped isotope thermometry to well-dated carbonate paleosols and marls in the Gonjo Basin, SE Tibet, to reveal the topographic evolution of the basin. The sedimentary ages of carbonates of the lower and upper Ranmugou Formation are constrained to 54-50 Ma and 44-40 Ma, respectively. The temperature derived from carbonate clumped isotope thermometry indicates the mean annual air temperature (MAAT) of the Gonjo Basin in the early Eocene was similar to 24 degrees C, which is consistent with the warm climate indicated by palm fossils. The MAAT of the basin in the middle Eocene was similar to 7 degrees C, 17 degrees C cooler than in the early Eocene. Carbonate clumped oxygen isotope thermometry-based paleoaltimetry shows the Gonjo Basin experienced a rapid uplift of 3.1 km, from similar to 0.7 km in the early Eocene to similar to 3.8 km in the middle Eocene. This rise explains the marked cooling. As a cause of this rapid rise, and the associated regional climate change transforming the landscape from desert to forest, we invoke crustal deformation and thickening induced by intracontinental subduction between the Lhasa and Qiangtang terranes that comprise the core of the Tibet. (C) 2020 Published by Elsevier B.V.

引用

页数：13

共 78 条

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