Does Large‐Scale Crustal Flow Shape the Eastern Margin of the Tibetan Plateau? Insights From Episodic Magmatism of Gongga‐Zheduo Granitic Massif
Abstract 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...
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| Format: | Article |
| Language: | English |
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Wiley
2022-06-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2022GL098756 |
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| author | Fangyang Hu Fu‐Yuan Wu Mihai N. Ducea James B. Chapman Lei Yang |
| author_facet | Fangyang Hu Fu‐Yuan Wu Mihai N. Ducea James B. Chapman Lei Yang |
| author_sort | Fangyang Hu |
| collection | DOAJ |
| description | Abstract 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 | Article |
| id | doaj-art-24711b56dd8c441d9a328d71e5664920 |
| institution | Kabale University |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2022-06-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-24711b56dd8c441d9a328d71e56649202025-01-22T14:38:16ZengWileyGeophysical Research Letters0094-82761944-80072022-06-014912n/an/a10.1029/2022GL098756Does Large‐Scale Crustal Flow Shape the Eastern Margin of the Tibetan Plateau? Insights From Episodic Magmatism of Gongga‐Zheduo Granitic MassifFangyang Hu0Fu‐Yuan Wu1Mihai N. Ducea2James B. Chapman3Lei Yang4Key Laboratory of Mineral Resources Institute of Geology and Geophysics Chinese Academy of Sciences Beijing ChinaInnovation Academy for Earth Science Chinese Academy of Sciences Beijing ChinaDepartment of Geosciences University of Arizona Tucson AZ USADepartment of Geology and Geophysics University of Wyoming Laramie WY USACollege of Earth Sciences Chengdu University of Technology Chengdu ChinaAbstract 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.https://doi.org/10.1029/2022GL098756Gongga‐Zheduogranitic rockseastern Tibetan PlateauCenozoiccrustal flow |
| spellingShingle | Fangyang Hu Fu‐Yuan Wu Mihai N. Ducea James B. Chapman Lei Yang Does Large‐Scale Crustal Flow Shape the Eastern Margin of the Tibetan Plateau? Insights From Episodic Magmatism of Gongga‐Zheduo Granitic Massif Geophysical Research Letters Gongga‐Zheduo granitic rocks eastern Tibetan Plateau Cenozoic crustal flow |
| 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 | Gongga‐Zheduo granitic rocks eastern Tibetan Plateau Cenozoic crustal flow |
| url | https://doi.org/10.1029/2022GL098756 |
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