Interaction of upwelling asthenosphere with oceanic lithospheric mantle in Bangong-Nujiang subduction zone: A new mechanism for the petrogenesis of Nb-enriched basalts
文献类型：期刊论文
| 作者 | Huang, Qiang-Tai3,4; Zhang, Cheng-Lei4; Zhang, Kai-Jun1; Hua, Yuan-Jun4; Chen, Wen-Chao4; Cao, Yu-Dong4; Cheng, Peng2 |
| 刊名 | LITHOS
 |
| 出版日期 | 2023-07-01 |
| 卷号 | 448-449页码:15 |
| 关键词 | Nb-enriched basalts Geochronology Geochemistry Sr-Nd isotopes Bangong-Nujiang Meso-Tethys Tibet |
| ISSN号 | 0024-4937 |
| DOI | 10.1016/j.lithos.2023.107172 |
| 英文摘要 | When impinging on the lithosphere in spreading ridges or intra-plate settings, the asthenospheric mantle can significantly influence plate tectonics. However, the active role of the asthenospheric mantle on subducting slabs remains poorly understood. The main reason for this dispute is the lack of typical geochemical mafic rocks in the subduction zone. In this paper, we first report the Early Jurassic (187 Ma) Yurongguo Nb-enriched basalts in the western segment of the Bangong-Nujiang suture zone. These samples show typical Nb-enriched basaltic features with high Na2O, TiO2, Nb (>7 ppm), high Nb/Th (average =11.05), Nb/La (average = 1.37) and Nb/U (average = 72.98) ratios. Unlike the adakite-related Nb-enriched basalts, the Yurongguo Nb-enriched basalts formed from the mixture of magmas derived from upwelling asthenosphere (20-30%) and depleted mantle (70-80%) in the spinel lherzolite region (<70 km). We conclude the Yurongguo Nb-enriched basalts were formed in the fore-arc basin setting with the influence of slab rollback, which occurred under the intra-oceanic subduction. Two southward intra-oceanic subductions may exist in the western part of the Bangong-Nujiang Tethyan Ocean in the Jurassic. The Early Jurassic (200-180 Ma) intra-oceanic subduction formed the fore-arc basin, probably accompanied by asthenospheric mantle activity at the same time, followed closely by flat subduction due to the oceanic plateau. After a period of geological stabilization, the Late Jurassic (170-150 Ma) was the period when the spreading of the little ocean basin ceased, and the second intra-oceanic subduction occurred. We proposed an oceanic plateau-subducted oceanic slab interaction and overriding intra-oceanic subduction model for the MesoTethyan subduction in the western Tibetan Plateau. |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:001033529900001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/74475]  |
| 专题 | 中国科学院矿物学与成矿学重点实验室 |
| 通讯作者 | Huang, Qiang-Tai |
| 作者单位 | 1.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Asian Tecton Res Grp, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Peoples R China 3.Guangdong Prov Key Lab Marine Resources & Coastal, Zhuhai 519082, Peoples R China 4.Sun Yat Sen Univ, Sch Marine Sci, Zhuhai 519082, Peoples R China |
| 推荐引用方式 GB/T 7714 | Huang, Qiang-Tai,Zhang, Cheng-Lei,Zhang, Kai-Jun,et al. Interaction of upwelling asthenosphere with oceanic lithospheric mantle in Bangong-Nujiang subduction zone: A new mechanism for the petrogenesis of Nb-enriched basalts[J]. LITHOS,2023,448-449:15. |
| APA | Huang, Qiang-Tai.,Zhang, Cheng-Lei.,Zhang, Kai-Jun.,Hua, Yuan-Jun.,Chen, Wen-Chao.,...&Cheng, Peng.(2023).Interaction of upwelling asthenosphere with oceanic lithospheric mantle in Bangong-Nujiang subduction zone: A new mechanism for the petrogenesis of Nb-enriched basalts.LITHOS,448-449,15. |
| MLA | Huang, Qiang-Tai,et al."Interaction of upwelling asthenosphere with oceanic lithospheric mantle in Bangong-Nujiang subduction zone: A new mechanism for the petrogenesis of Nb-enriched basalts".LITHOS 448-449(2023):15. |
入库方式： OAI收割
来源：广州地球化学研究所
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