Early Cretaceous magmatism in Yunnan traces the tectonic transition from the Tengchong-Baoshan continental collision to Neo-Tethyan slab rollback
文献类型：期刊论文
| 作者 | Zhang, Jiuyuan5,6; Fan, Weiming2,6; Xu, Xi5; Peng, Touping1,3 ; Ratschbacher, Lothar4; Wang, Baodi5
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| 刊名 | LITHOS
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| 出版日期 | 2023-11-01 |
| 卷号 | 456页码:16 |
| 关键词 | Early Cretaceous Tengchong Block Adakitic rocks Geochemical transitions Tethys evolution |
| ISSN号 | 0024-4937 |
| DOI | 10.1016/j.lithos.2023.107316 |
| 英文摘要 | Early Cretaceous magmatic rocks of the Tengchong and Baoshan blocks provide insight into the late Mesozoic evolution of southeastern Tibet-Yunnan. We present LA-ICP-MS U-Pb zircon age, zircon eHf(t) isotope, and whole-rock geochemical and Sr-Nd isotopic data for dioritic porphyrite and rhyolite, outcropping in the Eastern Tengchong Belt and the Gaoligong Belt, respectively. The dioritic porphyrite has a 123.0 +/- 1.3 Ma (2 sigma) age, negative whole-rock (epsilon Nd)(t) of 1.99 to 2.16, initial Sr-87/Sr-86 of 0.70690-0.70734, zircon (epsilon Hf)(t) of 1.42 to 4.11, and adakitic geochemical features, suggesting an origin from mixing of mantle- and crust-derived magmas; the rhyolite has a 122.2 +/- 1.0 Ma age, low whole-rock (epsilon Nd)(t) of 9.69 to 8.83, initial Sr-87/Sr-86 of 0.71104-0.71246, and zircon (epsilon Hf)(t) of 8.55 to 2.59, suggesting crustal derivation. Our data-along with the published data-suggest that the Early Cretaceous rocks (140-109 Ma) comprise two magmatic phases with a geochemical and isotopic transition at similar to 123 Ma. The 140-123 Ma phase-mainly outcropping in the Gaoligong Belt-is mainly peraluminous, highly silicic, and has negative zircon (epsilon Hf)(t) values, suggesting derivation from remelting of ancient crust in a postcollisional setting; the 123-109 Ma phase is mainly metaluminous, restricted to the Eastern Tengchong Belt, and formed in a continental-arc setting with mantle melt involved. We propose that the similar to 123 Ma geochemical and isotopic change marks the transition from contraction due to the Tengchong-Baoshan collision to extension resulting from slab rollback of the Neo-Tethyan lithospheric slab. |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:001081414900001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/78886]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 通讯作者 | Zhang, Jiuyuan; Fan, Weiming |
| 作者单位 | 1.Chinese Acad Sci, Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China 4.TU Bergakad Freiberg, Geol, D-09599 Freiberg, Germany 5.China Geol Survey, China Aero Geophys Survey & Remote Sensing Ctr Na, Beijing 100083, Peoples R China 6.Chinese Acad Sci, Inst Tibetan Plateau Res, State Key Lab Tibetan Plateau Earth Syst Environm, Beijing 100101, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, Jiuyuan,Fan, Weiming,Xu, Xi,et al. Early Cretaceous magmatism in Yunnan traces the tectonic transition from the Tengchong-Baoshan continental collision to Neo-Tethyan slab rollback[J]. LITHOS,2023,456:16. |
| APA | Zhang, Jiuyuan,Fan, Weiming,Xu, Xi,Peng, Touping,Ratschbacher, Lothar,&Wang, Baodi.(2023).Early Cretaceous magmatism in Yunnan traces the tectonic transition from the Tengchong-Baoshan continental collision to Neo-Tethyan slab rollback.LITHOS,456,16. |
| MLA | Zhang, Jiuyuan,et al."Early Cretaceous magmatism in Yunnan traces the tectonic transition from the Tengchong-Baoshan continental collision to Neo-Tethyan slab rollback".LITHOS 456(2023):16. |
入库方式： OAI收割
来源：广州地球化学研究所
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