Lithospheric Evolution and Uplift of the Tibetan Plateau During Continental Convergence: Evidence From Early Oligocene Pseudo leucite Phonolites from Southern Qian tang, Central Tibet
文献类型：期刊论文
| 作者 | Liu, Mao-Rui1,7; Ou, Quan6; Wang, Qiang1,5,7; Qi, Yue1,5; Kerr, Andrew C.4; Wyman, Derek3; Dan, Wei1,5 ; Hao, Lu-Lu1,5; Jiang, Zi-Qi2
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| 刊名 | JOURNAL OF PETROLOGY
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| 出版日期 | 2024-10-24 |
| 卷号 | 65期号:11页码:21 |
| 关键词 | silicic alkaline magmas Central Tibet lithospheric removal surface uplift |
| ISSN号 | 0022-3530 |
| DOI | 10.1093/petrology/egae113 |
| 英文摘要 | The Cenozoic collision of India and Eurasia clearly built the high-elevation Tibetan Plateau, but how this collision was accommodated, and the Tibetan Plateau uplifted, remains an area of study. The widespread occurrence of Cenozoic potassic-ultrapotassic lavas provides a valuable opportunity to constrain the relationship between surface deformation and underlying geodynamic processes. In this study, we report sanidine Ar-Ar dating, whole-rock geochemical and clinopyroxene Sr-Nd isotope analyses on pseudoleucite phonolites from the Yulinshan area of south Qiangtang (central Tibet) to determine their petrogenesis and regional tectonic significance. Sanidine Ar-Ar dating yields an Early Oligocene age of ca. 30 Ma, in agreement with previous studies. A high modal abundance of pseudoleucite in the samples indicates their ultrapotassic and silica-undersaturated composition. All of the rocks have typical arc- like geochemical signatures and enriched whole rock and clinopyroxene Sr-Nd isotope signatures. Based on thermodynamic phase equilibria modeling and our detailed study of the textural and in-situ compositional information of clinopyroxene, the intermediate to felsic potassic magmas are interpreted to have been formed through differentiation of primitive, mantle-derived, potassic magmas at shallow crustal levels. The inferred enrichment of the lithospheric mantle is probably related to subduction of the Songpan-Ganze continental lithosphere beneath Qiangtang after India-Asia collision. Voluminous Late Eocene-Early Oligocene magmatism in central Tibet may reflect partial removal of the mantle lithosphere, perhaps triggered by instabilities associated with previous lithospheric thickening. Our work provides additional constraints on the timing of mantle root loss that likely contributed to the surface uplift of central Tibet, which post-dated the cessation of upper crustal shortening and deformation. |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001352633000001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/82079]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 通讯作者 | Wang, Qiang; Qi, Yue |
| 作者单位 | 1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Kehua St 511, Guangzhou 510640, Peoples R China 2.Guilin Univ Technol, Coll Earth Sci, Jiangan Rd 10, Guilin, 2006, Peoples R China 3.Univ Sydney, Sch Geosci, Sydney, NSW 2006, Australia 4.Cardiff Univ, Sch Earth & Environm Sci, Cardiff CF10 3AT, Wales 5.CAS Ctr Excellence Deep Earth Sci, Kehua St 511, Guangzhou 510640, Peoples R China 6.Chengdu Univ Technol, Inst Sedimentary Geol, State Key Lab Oil & Gas Reservoir Geol & Exploitat, East Third Rd 1, Chengdu 610059, Peoples R China 7.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Yuquan St 19, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu, Mao-Rui,Ou, Quan,Wang, Qiang,et al. Lithospheric Evolution and Uplift of the Tibetan Plateau During Continental Convergence: Evidence From Early Oligocene Pseudo leucite Phonolites from Southern Qian tang, Central Tibet[J]. JOURNAL OF PETROLOGY,2024,65(11):21. |
| APA | Liu, Mao-Rui.,Ou, Quan.,Wang, Qiang.,Qi, Yue.,Kerr, Andrew C..,...&Jiang, Zi-Qi.(2024).Lithospheric Evolution and Uplift of the Tibetan Plateau During Continental Convergence: Evidence From Early Oligocene Pseudo leucite Phonolites from Southern Qian tang, Central Tibet.JOURNAL OF PETROLOGY,65(11),21. |
| MLA | Liu, Mao-Rui,et al."Lithospheric Evolution and Uplift of the Tibetan Plateau During Continental Convergence: Evidence From Early Oligocene Pseudo leucite Phonolites from Southern Qian tang, Central Tibet".JOURNAL OF PETROLOGY 65.11(2024):21. |
入库方式： OAI收割
来源：广州地球化学研究所
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