Miocene Subsidence and Surface Uplift of Southernmost Tibet Induced by Indian Subduction Dynamics

T. Shen; G. Wang; A. Replumaz; L. Husson; A. A. G. Webb; M. Bernet; P. H. Leloup; P. Zhang; G. Mahéo

doi:10.1029/2020gc009078

journal article Oct 01, 2020

Miocene Subsidence and Surface Uplift of Southernmost Tibet Induced by Indian Subduction Dynamics

T. Shen

G. Wang

A. Replumaz

L. Husson

A. A. G. Webb M. Bernet

P. H. Leloup

P. Zhang

G. Mahéo

Geochemistry, Geophysics, Geosystems Vol. 21 No. 10 · American Geophysical Union (AGU)

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Abstract

AbstractThe Indus‐Yarlung suture of southernmost Tibet marks the initial collisional zone, the ongoing India‐Asia collision, and yet more than ~30 million years after the onset of collision, a thick detrital sedimentary unit was deposited just north of the suture: the Kailas Formation. The mechanism permitting subsidence of the deep intracontinental Kailas basin in a compressional tectonic regime remains uncertain. We present new apatite (16–11 Ma) and zircon (24–19 Ma) fission track (AFT and ZFT) ages from the Gangdese batholith just north of the Kailas basin. ZFT analysis of modern‐river sand from the northern Gangdese magmatic arc indicates an exhumation at 27.3 ± 1.3 Ma. Thermal modeling indicates that the batholith experienced reheating between 28 and 20 Ma, coeval with deposition in the Kailas basin (between 26 and 21 Ma), followed by overall rapid cooling between 20 and 17 Ma. We interpret this thermal history as a phase of regional Oligocene‐Miocene sedimentary burial followed by exhumation. By modeling mantle dynamics in the geodynamic framework of the India‐Asia collision, we show that transient dynamic topography over the relative southward folding of the Indian slab is consistent with burial and exhumation of the Gangdese magmatic arc during Oligocene‐Miocene time. The northward migration of the Indian continent relative to its own stati onary slab created a wave of dynamic topography that caused subsidence in the overriding plate north of the Himalaya, followed by a phase of surface uplift since ~27 Ma of the northern Gangdese magmatic arc. During latest Oligocene‐early Miocene time, the dynamic deflection center was in the Kailas area, and it progressively relocated southward to its present position at the Ganges basin.

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Details

Published: Oct 01, 2020
Vol/Issue: 21(10)
License: View

Authors

T

T. Shen

School of Earth Sciences, Center for Global Tectonics, and State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Wuhan China

G

G. Wang

School of Earth Sciences, Center for Global Tectonics, and State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Wuhan China

A

A. Replumaz

Institut des Sciences de la Terre, Université Grenoble Alpes, CNRS Grenoble France

L

L. Husson

Institut des Sciences de la Terre, Université Grenoble Alpes, CNRS Grenoble France

A

A. A. G. Webb

Division of Earth and Planetary Science and Laboratory for Space Research University of Hong Kong Hong Kong

M

M. Bernet

Institut des Sciences de la Terre, Université Grenoble Alpes, CNRS Grenoble France

P

P. H. Leloup

Laboratoire de Géologie de Lyon, CNRS UMR 5570, Université de Lyon 1 Villeurbanne France

P

P. Zhang

School of Earth Sciences, Center for Global Tectonics, and State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Wuhan China

G

G. Mahéo

Laboratoire de Géologie de Lyon, CNRS UMR 5570, Université de Lyon 1 Villeurbanne France

Funding

National Natural Science Foundation of China Award: 41702208

China Geological Survey Award: 1212011121261

Cite This Article

T. Shen, G. Wang, A. Replumaz, et al. (2020). Miocene Subsidence and Surface Uplift of Southernmost Tibet Induced by Indian Subduction Dynamics. Geochemistry, Geophysics, Geosystems, 21(10). https://doi.org/10.1029/2020gc009078

Miocene Subsidence and Surface Uplift of Southernmost Tibet Induced by Indian Subduction Dynamics

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