Southwestward growth of plateau surfaces in eastern Tibet

Cao, Kai; Tian, Yuntao; Beek, Peter van der; Wang, Guocan; Shen, Tianyi; Reiners, Peter W.; Bernet, Matthias; Husson, Laurent

doi:10.1016/j.earscirev.2022.104160

Cited by 31 publications

(25 citation statements)

References 134 publications

(148 reference statements)

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“…Recent analyses have come to a consensus that asynchronous uplift processes occurred across different regions of the plateau (e.g., Ding et al, 2022;Spicer et al, 2021aSpicer et al, , 2021bWang et al, 2008Wang et al, , 2014. The central and eastern Tibetan Plateau have been proposed to have experienced rapid surface uplift during the late Eocene-Oligocene, bracketing the study period (Cao et al, 2022;Ding et al, 2022;Fang et al, 2020;Li et al, 2022;Su et al, 2019;Xiong et al, 2022). However, regional climate model results indicate that the EASM would intensify under the influence of the uplift of the central and eastern Tibetan Plateau (Tang et al, 2013;Yu et al, 2018), which clearly contradicts the weakened EASM suggested in this study.…”

Section: Global Cooling-driven Weakening Of the Summer Monsoon Across...mentioning

confidence: 99%

Global Cooling‐Driven Summer Monsoon Weakening in South China Across the Eocene‐Oligocene Transition

Jiao,

Wan,

et al. 2023

JGR Solid Earth

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Recent research has suggested that East Asia has experienced a prevailing monsoon climate since the Eocene. However, there is little knowledge about the development of the East Asian monsoon system before the Miocene, particularly in southern China, due to a lack of well‐dated continuous sediment records. Here, we present new magnetic proxy records from International Ocean Discovery Program Site U1501 in the northern South China Sea. We conducted rock magnetic experiments, made scanning electron microscopy observations and performed diffuse reflectance spectrum analysis on the late Eocene‐early Oligocene core sediments. The magnetic signal of the sediments is dominated by detrital magnetite and titanomagnetite formed during the silicate weathering and erosion processes, which were used to infer the evolution of summer monsoon precipitation in southern China. Our results along with geochemical and clay mineral data from Site U1501 strongly indicate that the East Asian summer monsoon generally weakened across the Eocene‐Oligocene transition. This change was linked to coeval global cooling rather than tectonic processes. Prior to the Eocene‐Oligocene transition, the summer monsoon intensified, likely due to the latest Eocene warming event caused by the enhancement of the Atlantic Meridional Overturning Circulation, which may have preconditioned the Earth system for the greenhouse‐to‐icehouse transition.

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Section: Global Cooling-driven Weakening Of the Summer Monsoon Across...mentioning

confidence: 99%

Global Cooling‐Driven Summer Monsoon Weakening in South China Across the Eocene‐Oligocene Transition

Jiao,

Wan,

et al. 2023

JGR Solid Earth

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“…The eastern and southeastern plateau margins exhibit distinct regional structural and morphological characteristics, in which the landscape is characterized by a long‐wavelength and low gradient topography (e.g., K. Cao et al., 2019, 2022; Kirby et al., 2003; Liu‐Zeng et al., 2008; Ouimet et al., 2010; Tian et al., 2015; R. Yang et al., 2015). Two leading hypotheses are commonly cited to explain the tectonic evolution of these areas.…”

Section: Introductionmentioning

confidence: 99%

New Constraints on the Late Oligocene‐Miocene Thermo‐Tectonic Evolution of the Southeastern Tibetan Plateau From Low‐Temperature Thermochronology

Zhong

Cao

et al. 2023

Tectonics

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The southeastern (SE) Tibetan Plateau (Yunnan) is characterized by low‐relief uplands that were deeply incised by large rivers. The thermal history of basement rocks in this region remains poorly investigated, while this data is needed to elucidate the complex relationship between tectonics and climate in shaping the surface. To better understand its thermo‐tectonic evolution, we carried out apatite fission track thermochronology on 31 samples collected from a large area that covers different tectonic units, including a vertical profile in the middle Mekong River valley; additional zircon LA‐ICP‐MS U‐Pb dating was performed on four basement rocks. Our results confirm that a large portion of Mesozoic crystalline rocks constitute the basement of the SE Tibetan Plateau. Inverse thermal history modeling of fission track data reveal extensive late Oligocene to Miocene rapid basement cooling and exhumation episodes from both inside and outside the active zones (i.e., ductile shear zone and river valley). These thermal events were coincident with the activities of large‐scale strike‐slip faults that dominate the structural framework. Combined with the published data, we propose that widespread crustal shortening and thickening took place in the SE Tibetan Plateau during the Oligocene‐Miocene in the context of a compressive tectonic regime. Low‐temperature thermochronological data reveal that both tectonic forcing and climate‐driven erosion have played important roles in exhuming the basement rocks in the region. It is also deduced that the present‐day relatively low‐elevation landscape of the Yunnan area resulted from complex interaction between regional tectonic activity and surficial erosion since the late Oligocene.

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“…1 and 2). So far, a series of studies have been conducted to constrain the tectonic and topographic evolution of eastern Tibet, which displays unique high-elevation, low-relief 'relict' landscapes (e.g., Clark et al, 2006;Yuan et al, 2021;Cao et al, 2022). By comparison, little attention has been paid to how the contrasting topography developed in southern Tibet, although it represents a distinct geomorphic feature with high significance for understanding the topographic history of the Tibetan Plateau.…”

Section: Introductionmentioning

confidence: 99%

Cenozoic low temperature cooling history of the eastern Lhasa terrane: Implications for high-relief topography of external drainage area in the southern Tibetan Plateau

Su¹,

He²,

Zhong³

et al. 2023

Geoscience Frontiers

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Southwestward growth of plateau surfaces in eastern Tibet

Cited by 31 publications

References 134 publications

Global Cooling‐Driven Summer Monsoon Weakening in South China Across the Eocene‐Oligocene Transition

Global Cooling‐Driven Summer Monsoon Weakening in South China Across the Eocene‐Oligocene Transition

New Constraints on the Late Oligocene‐Miocene Thermo‐Tectonic Evolution of the Southeastern Tibetan Plateau From Low‐Temperature Thermochronology

Cenozoic low temperature cooling history of the eastern Lhasa terrane: Implications for high-relief topography of external drainage area in the southern Tibetan Plateau

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