Cargando…

Does Large‐Scale Crustal Flow Shape the Eastern Margin of the Tibetan Plateau? Insights From Episodic Magmatism of Gongga‐Zheduo Granitic Massif

The mechanisms driving crustal deformation and uplift of orogenic plateaus are fundamental to continental tectonics. Large‐scale crustal flow has been hypothesized to occur in eastern Tibet, but it remains controversial due to a lack of geologic evidence. Geochemical and isotopic data from Cenozoic...

Descripción completa

Detalles Bibliográficos
Autores principales: Hu, Fangyang, Wu, Fu‐Yuan, Ducea, Mihai N., Chapman, James B., Yang, Lei
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9287050/
https://www.ncbi.nlm.nih.gov/pubmed/35865913
http://dx.doi.org/10.1029/2022GL098756
_version_ 1784748163578462208
author Hu, Fangyang
Wu, Fu‐Yuan
Ducea, Mihai N.
Chapman, James B.
Yang, Lei
author_facet Hu, Fangyang
Wu, Fu‐Yuan
Ducea, Mihai N.
Chapman, James B.
Yang, Lei
author_sort Hu, Fangyang
collection PubMed
description The mechanisms driving crustal deformation and uplift of orogenic plateaus are fundamental to continental tectonics. Large‐scale crustal flow has been hypothesized to occur in eastern Tibet, but it remains controversial due to a lack of geologic evidence. Geochemical and isotopic data from Cenozoic igneous rocks in the eastern Tibet‐Gongga‐Zheduo intrusive massif, provide a way to test this model. Modeling results suggest that Cenozoic magmas originated at depths of ∼30–40 km, the depth that crustal flow has been postulated to occur at. Detailed isotopic analyses indicate that the igneous rocks are derived from partial melting of the local Songpan‐Ganzi crust, arguing against a long‐distance crustal flow. Episodic magmatism during the Cenozoic showing a repeated shifting of magmatic sources can be correlated with crustal uplift. The continued indentation of the Indian Block and upwelling of the asthenosphere contribute to the crustal deformation, magmatism, and uplift.
format Online
Article
Text
id pubmed-9287050
institution National Center for Biotechnology Information
language English
publishDate 2022
publisher John Wiley and Sons Inc.
record_format MEDLINE/PubMed
spelling pubmed-92870502022-07-19 Does Large‐Scale Crustal Flow Shape the Eastern Margin of the Tibetan Plateau? Insights From Episodic Magmatism of Gongga‐Zheduo Granitic Massif Hu, Fangyang Wu, Fu‐Yuan Ducea, Mihai N. Chapman, James B. Yang, Lei Geophys Res Lett Research Letter The mechanisms driving crustal deformation and uplift of orogenic plateaus are fundamental to continental tectonics. Large‐scale crustal flow has been hypothesized to occur in eastern Tibet, but it remains controversial due to a lack of geologic evidence. Geochemical and isotopic data from Cenozoic igneous rocks in the eastern Tibet‐Gongga‐Zheduo intrusive massif, provide a way to test this model. Modeling results suggest that Cenozoic magmas originated at depths of ∼30–40 km, the depth that crustal flow has been postulated to occur at. Detailed isotopic analyses indicate that the igneous rocks are derived from partial melting of the local Songpan‐Ganzi crust, arguing against a long‐distance crustal flow. Episodic magmatism during the Cenozoic showing a repeated shifting of magmatic sources can be correlated with crustal uplift. The continued indentation of the Indian Block and upwelling of the asthenosphere contribute to the crustal deformation, magmatism, and uplift. John Wiley and Sons Inc. 2022-06-24 2022-06-28 /pmc/articles/PMC9287050/ /pubmed/35865913 http://dx.doi.org/10.1029/2022GL098756 Text en © 2022. The Authors. https://creativecommons.org/licenses/by-nc-nd/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc-nd/4.0/ (https://creativecommons.org/licenses/by-nc-nd/4.0/) License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.
spellingShingle Research Letter
Hu, Fangyang
Wu, Fu‐Yuan
Ducea, Mihai N.
Chapman, James B.
Yang, Lei
Does Large‐Scale Crustal Flow Shape the Eastern Margin of the Tibetan Plateau? Insights From Episodic Magmatism of Gongga‐Zheduo Granitic Massif
title Does Large‐Scale Crustal Flow Shape the Eastern Margin of the Tibetan Plateau? Insights From Episodic Magmatism of Gongga‐Zheduo Granitic Massif
title_full Does Large‐Scale Crustal Flow Shape the Eastern Margin of the Tibetan Plateau? Insights From Episodic Magmatism of Gongga‐Zheduo Granitic Massif
title_fullStr Does Large‐Scale Crustal Flow Shape the Eastern Margin of the Tibetan Plateau? Insights From Episodic Magmatism of Gongga‐Zheduo Granitic Massif
title_full_unstemmed Does Large‐Scale Crustal Flow Shape the Eastern Margin of the Tibetan Plateau? Insights From Episodic Magmatism of Gongga‐Zheduo Granitic Massif
title_short Does Large‐Scale Crustal Flow Shape the Eastern Margin of the Tibetan Plateau? Insights From Episodic Magmatism of Gongga‐Zheduo Granitic Massif
title_sort does large‐scale crustal flow shape the eastern margin of the tibetan plateau? insights from episodic magmatism of gongga‐zheduo granitic massif
topic Research Letter
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9287050/
https://www.ncbi.nlm.nih.gov/pubmed/35865913
http://dx.doi.org/10.1029/2022GL098756
work_keys_str_mv AT hufangyang doeslargescalecrustalflowshapetheeasternmarginofthetibetanplateauinsightsfromepisodicmagmatismofgonggazheduograniticmassif
AT wufuyuan doeslargescalecrustalflowshapetheeasternmarginofthetibetanplateauinsightsfromepisodicmagmatismofgonggazheduograniticmassif
AT duceamihain doeslargescalecrustalflowshapetheeasternmarginofthetibetanplateauinsightsfromepisodicmagmatismofgonggazheduograniticmassif
AT chapmanjamesb doeslargescalecrustalflowshapetheeasternmarginofthetibetanplateauinsightsfromepisodicmagmatismofgonggazheduograniticmassif
AT yanglei doeslargescalecrustalflowshapetheeasternmarginofthetibetanplateauinsightsfromepisodicmagmatismofgonggazheduograniticmassif