Spatiotemporal Variation of the Cretaceous-Eocene Arc Magmatism in Lhasa-Tengchong Terrane
文献类型：期刊论文
| 作者 | Liu, Yongmin3,4; Fan, Weiming3,4; Peng, Touping1 ; Shi, Rendeng3,4; Chen, Shengsheng2; Huangfu, Pengpeng3
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| 刊名 | GEOPHYSICAL RESEARCH LETTERS
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| 出版日期 | 2024-04-16 |
| 卷号 | 51期号:7页码:9 |
| ISSN号 | 0094-8276 |
| DOI | 10.1029/2024GL108419 |
| 英文摘要 | It was recognized that two magmatic belts in the Lhasa-Tengchong terrane formed due to the Mesozoic-Cenozoic Tethyan evolution. Still, their spatiotemporal variations of magmatic flare-ups/lulls are rarely discussed. Here we use the new U-Pb and Lu-Hf isotopic data of captured zircons and a comprehensive data set to show that the flare-up of northern magmatic belt has peak ages of 110 Ma in central and northern Lhasa and 120 Ma in eastern Tengchong, possibly related to the tectonic transition from Meso- and Neo-Tethyan double subduction to Neo-Tethyan single subduction. For the southern magmatic belt, the flare-ups at 100-85 Ma and 65-45 Ma in eastern southern Lhasa indicate obvious juvenile crustal growth, while flare-ups at 75-45 Ma in western southern Lhasa and Tengchong record ancient crustal reworking. Such flare-up variations in the southern magmatic belt possibly resulted from asynchronous changes in the Neo-Tethyan slab dip. The Tethyan slab subduction and following collision of India and Asia produced two magmatic belts in the Lhasa-Tengchong terrane. How did the magmatic flare-ups or high-flux episodes and sources spatiotemporally vary? We combine the new U-Pb and Lu-Hf isotopic data of captured zircons (xenocrystic zircons caught by volcanics from country rocks) and a comprehensive data set to show that the peak ages of early Cretaceous flare-up of the northern magmatic belt are ca.10 Ma younger in central and northern Lhasa than in eastern Tengchong, possibly related to the diachronous closure of the Meso-Tethys and flat subduction of the Neo-Tethys. The southern magmatic belt in Tengchong and western southern Lhasa exhibit 75-45 Ma flare-ups featured by the reworking of ancient crust, different from the eastern southern Lhasa with the flare-ups at 100-85 Ma and 65-45 Ma which are dominated by the juvenile crustal growth. Such flare-up variations may be related to changes of the Neo-Tethyan slab dip. The Neo-Tethyan arc has asynchronous magmatic flare-ups and diverse magmatic sources The spatiotemporal changes of slab dip triggered the asynchronous flare-ups of the Neo-Tethyan arc |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001195783500001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/77190]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 通讯作者 | Liu, Yongmin; Fan, Weiming |
| 作者单位 | 1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou, Peoples R China 2.China Univ Geosci Beijing, Sch Earth Sci & Resources, Beijing, Peoples R China 3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China 4.Chinese Acad Sci, Inst Tibetan Plateau Res, State Key Lab Tibetan Plateau Earth Syst Environm, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu, Yongmin,Fan, Weiming,Peng, Touping,et al. Spatiotemporal Variation of the Cretaceous-Eocene Arc Magmatism in Lhasa-Tengchong Terrane[J]. GEOPHYSICAL RESEARCH LETTERS,2024,51(7):9. |
| APA | Liu, Yongmin,Fan, Weiming,Peng, Touping,Shi, Rendeng,Chen, Shengsheng,&Huangfu, Pengpeng.(2024).Spatiotemporal Variation of the Cretaceous-Eocene Arc Magmatism in Lhasa-Tengchong Terrane.GEOPHYSICAL RESEARCH LETTERS,51(7),9. |
| MLA | Liu, Yongmin,et al."Spatiotemporal Variation of the Cretaceous-Eocene Arc Magmatism in Lhasa-Tengchong Terrane".GEOPHYSICAL RESEARCH LETTERS 51.7(2024):9. |
入库方式： OAI收割
来源：广州地球化学研究所
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