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| DOI | 10.1029/2023TC007954 |
| Diverse Structural Styles of the Northeastern Tethyan Himalaya in Southern Tibet Reveal the Early Collisional Tectonics of India and Asia | |
| 发表日期 | 2024 |
| ISSN | 0278-7407 |
| EISSN | 1944-9194 |
| 起始页码 | 43 |
| 结束页码 | 3 |
| 卷号 | 43期号:3 |
| 英文摘要 | The poor understanding of the structural history of the Late Triassic flysch in the northeastern Tethyan Himalaya has caused many disputes regarding India-Asia collisional tectonics. Here, we conducted an integrated study including tectonostratigraphic analysis, structural analysis, and zircon U-Pb and muscovite 40Ar/39Ar dating to unravel the structural evolution of the Late Triassic flysch. Field geological mapping revealed that the flysch can be subdivided into three structural units, including the Gyaca melange, Qiongjie-Dengmu shear zone and Langjiexue fold-thrust belt. The three units all contain voluminous siliciclastic rocks deposited in an abyssal submarine fan environment at the Indian passive continental margin. The Gyaca melange shows a two-stage deformation process that generated a collisional melange resulting from the subduction of the Indian passive continental margin. 40Ar/39Ar dating of top-to-the-south shear bands and block-in-matrix structure indicate that the India-Asia collision happened no later than the Selandian (ca. 60 Ma). The divergent imbricated thrusting and folding of the Gyaca melange and Langjiexue fold-thrust belt formed a positive flower structure. The zircon U-Pb and 40Ar/39Ar dating of syntectonic dikes and sericite flakes within the Gyaca melange yield ages of ca. 56-55 Ma for the genesis of the divergent structures. Moreover, the Qiongjie-Dengmu dextral shear zone yields a sericite 40Ar/39Ar age of ca. 35 Ma and thus indicates a transient strike-slip stress regime. Generally, the early India-Asia collision tectonics in the northeastern Tethyan Himalaya showed episodic evolution with changing structural styles from melange formation to imbricate fold-thrust belt development and finally strike-slip shear generation. The Late Triassic flysch includes the Gyaca melange, Qiongjie-Dengmu shear zone and Langjiexue fold-thrust belt The bedding-parallel shear bands and block-in-matrix structure indicate that the India-Asia collision happened no later than ca. 60 Ma The Gyaca melange and Langjiexue fold-thrust belt formed divergent imbricated structures during the India-Asia collision at ca. 56-55 Ma |
| 英文关键词 | Tethyan Himalaya; structural style; deformation; collision; Melange |
| 语种 | 英语 |
| WOS研究方向 | Geochemistry & Geophysics |
| WOS类目 | Geochemistry & Geophysics |
| WOS记录号 | WOS:001179925200001 |
| 来源期刊 | TECTONICS
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/291974 |
| 作者单位 | China University of Geosciences; China University of Geosciences; Chengdu University of Technology |
| 推荐引用方式 GB/T 7714 | . Diverse Structural Styles of the Northeastern Tethyan Himalaya in Southern Tibet Reveal the Early Collisional Tectonics of India and Asia[J],2024,43(3). |
| APA | (2024).Diverse Structural Styles of the Northeastern Tethyan Himalaya in Southern Tibet Reveal the Early Collisional Tectonics of India and Asia.TECTONICS,43(3). |
| MLA | "Diverse Structural Styles of the Northeastern Tethyan Himalaya in Southern Tibet Reveal the Early Collisional Tectonics of India and Asia".TECTONICS 43.3(2024). |
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