Chronological framework of the Ailaoshan metamorphic belt, southeastern Tibet: implications for Cenozoic tectonothermal evolution
The response mechanism of the southeastern Tibet Plateau to the Indian-Eurasian collision is still controversial. The widely distributed shear systems in the Sanjiang area especially Ailaoshan-Red River shear system contribute a window to understand the tectonic evolution. Here we compile comprehens...
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Taylor & Francis Group
2024-12-01
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| Online Access: | https://www.tandfonline.com/doi/10.1080/27669645.2024.2347697 |
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| author | Xiao-Fei Guo Qing-Long Wang |
| author_facet | Xiao-Fei Guo Qing-Long Wang |
| author_sort | Xiao-Fei Guo |
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| description | The response mechanism of the southeastern Tibet Plateau to the Indian-Eurasian collision is still controversial. The widely distributed shear systems in the Sanjiang area especially Ailaoshan-Red River shear system contribute a window to understand the tectonic evolution. Here we compile comprehensive geochronological data of the high-grade metamorphic rocks from the Ailaoshan-Red River shear system. The data reveal that the Ailaoshan metamorphic belt should be metamorphic complex with Middle-Late Triassic magmatic rocks and Cenozoic granites besides the Precambrian basement. The Cenozoic U-Pb age results of granitic rocks by accessory mineral within the Ailaoshan-Red River shear system range from ~41 Ma to ~20 Ma. The results of Ar-Ar dating of various minerals are in the range of ~40–5 Ma, concentrated in ~35–20 Ma. The U-Pb age results coincide basically with Ar-Ar data, indicating a rapid cooling process and reflecting a possible tectonic transition at ~20 Ma. The metamorphism and magmatism since the Cenozoic were not only unique to the Ailaoshan metamorphic belt, but also existed in the Chongshan and Gaoligongshan metamorphic belts. We infer that the Sanjiang area has a similar lateral extrusion deformation background and corresponds to the response of the India-Eurasia convergence process. |
| format | Article |
| id | doaj-art-d457b9d4f2cc4f4aa778335ca31d5278 |
| institution | OA Journals |
| issn | 2766-9645 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Taylor & Francis Group |
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| spelling | doaj-art-d457b9d4f2cc4f4aa778335ca31d52782025-08-20T02:20:55ZengTaylor & Francis GroupAll Earth2766-96452024-12-0136112010.1080/27669645.2024.2347697Chronological framework of the Ailaoshan metamorphic belt, southeastern Tibet: implications for Cenozoic tectonothermal evolutionXiao-Fei Guo0Qing-Long Wang1School of Resource and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi, PR ChinaPeriodical Press, Jiangxi University of Science and Technology, Ganzhou, Jiangxi, PR ChinaThe response mechanism of the southeastern Tibet Plateau to the Indian-Eurasian collision is still controversial. The widely distributed shear systems in the Sanjiang area especially Ailaoshan-Red River shear system contribute a window to understand the tectonic evolution. Here we compile comprehensive geochronological data of the high-grade metamorphic rocks from the Ailaoshan-Red River shear system. The data reveal that the Ailaoshan metamorphic belt should be metamorphic complex with Middle-Late Triassic magmatic rocks and Cenozoic granites besides the Precambrian basement. The Cenozoic U-Pb age results of granitic rocks by accessory mineral within the Ailaoshan-Red River shear system range from ~41 Ma to ~20 Ma. The results of Ar-Ar dating of various minerals are in the range of ~40–5 Ma, concentrated in ~35–20 Ma. The U-Pb age results coincide basically with Ar-Ar data, indicating a rapid cooling process and reflecting a possible tectonic transition at ~20 Ma. The metamorphism and magmatism since the Cenozoic were not only unique to the Ailaoshan metamorphic belt, but also existed in the Chongshan and Gaoligongshan metamorphic belts. We infer that the Sanjiang area has a similar lateral extrusion deformation background and corresponds to the response of the India-Eurasia convergence process.https://www.tandfonline.com/doi/10.1080/27669645.2024.2347697GeochronologyAilaoshan metamorphic beltSanjiang areaIndia-Eurasia collisiontectonic extrusion |
| spellingShingle | Xiao-Fei Guo Qing-Long Wang Chronological framework of the Ailaoshan metamorphic belt, southeastern Tibet: implications for Cenozoic tectonothermal evolution All Earth Geochronology Ailaoshan metamorphic belt Sanjiang area India-Eurasia collision tectonic extrusion |
| title | Chronological framework of the Ailaoshan metamorphic belt, southeastern Tibet: implications for Cenozoic tectonothermal evolution |
| title_full | Chronological framework of the Ailaoshan metamorphic belt, southeastern Tibet: implications for Cenozoic tectonothermal evolution |
| title_fullStr | Chronological framework of the Ailaoshan metamorphic belt, southeastern Tibet: implications for Cenozoic tectonothermal evolution |
| title_full_unstemmed | Chronological framework of the Ailaoshan metamorphic belt, southeastern Tibet: implications for Cenozoic tectonothermal evolution |
| title_short | Chronological framework of the Ailaoshan metamorphic belt, southeastern Tibet: implications for Cenozoic tectonothermal evolution |
| title_sort | chronological framework of the ailaoshan metamorphic belt southeastern tibet implications for cenozoic tectonothermal evolution |
| topic | Geochronology Ailaoshan metamorphic belt Sanjiang area India-Eurasia collision tectonic extrusion |
| url | https://www.tandfonline.com/doi/10.1080/27669645.2024.2347697 |
| work_keys_str_mv | AT xiaofeiguo chronologicalframeworkoftheailaoshanmetamorphicbeltsoutheasterntibetimplicationsforcenozoictectonothermalevolution AT qinglongwang chronologicalframeworkoftheailaoshanmetamorphicbeltsoutheasterntibetimplicationsforcenozoictectonothermalevolution |