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New constraints on Cenozoic subduction between India and Tibet.
Liu, Liang; Liu, Lijun; Morgan, Jason P; Xu, Yi-Gang; Chen, Ling.
Afiliação
  • Liu L; State Key Laboratory of Isotope Geochemistry and CAS center of Excellence in Deep Earth Science, Guangzhou Institute of Geochemistry, Chinese Academy of Science, Guangzhou, 510640, China. llsinogm@yeah.net.
  • Liu L; Department of Geology, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA. llsinogm@yeah.net.
  • Morgan JP; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, 511458, China. llsinogm@yeah.net.
  • Xu YG; Department of Geology, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA. ljliu@illinois.edu.
  • Chen L; Department of Marine Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, Guangdong, China.
Nat Commun ; 14(1): 1963, 2023 Apr 07.
Article em En | MEDLINE | ID: mdl-37029113
ABSTRACT
The type of lithosphere subducted between India and Tibet since the Paleocene remains controversial; it has been suggested to be either entirely continental, oceanic, or a mixture of the two. As the subduction history of this lost lithosphere strongly shaped Tibetan intraplate tectonism, we attempt to further constrain its nature and density structure with numerical models that aim to reproduce the observed history of magmatism and crustal thickening in addition to present-day plateau properties between 83°E and 88°E. By matching time-evolving geological patterns, here we show that Tibetan tectonism away from the Himalayan syntaxis is consistent with the initial indentation of a craton-like terrane at 55 ± 5 Ma, followed by a buoyant tectonic plate with a thin crust, e.g., a broad continental margin (Himalandia). This new geodynamic scenario can explain the seemingly contradictory observations that had led to competing hypotheses like the subduction of Greater India versus largely oceanic subduction prior to Indian indentation.

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Tipo de estudo: Prognostic_studies Idioma: En Revista: Nat Commun Ano de publicação: 2023 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Tipo de estudo: Prognostic_studies Idioma: En Revista: Nat Commun Ano de publicação: 2023 Tipo de documento: Article