An early Eocene magmatic event in southern Tibet triggered by oceanic slab break-off: evidence from ocean island basalt-like mafic rocks
文献类型：期刊论文
| 作者 | Lei, Ming1,2; Chen, Jianlin1,2 ; Wang, Dan1,2; Luo, Ying1,2; Liu, Yixin1,2
|
| 刊名 | CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
 |
| 出版日期 | 2023 |
| 卷号 | 178期号:1页码:17 |
| 关键词 | Eocene Zhongba basalts Carbonated peridotite Carbonate-bearing oceanic crust Slab break-off Southern Tibet |
| ISSN号 | 0010-7999 |
| DOI | 10.1007/s00410-022-01987-6 |
| 英文摘要 | The timing and origins of the Early Cenozoic magmatic flare-up in southern Tibet remain controversial, mainly because of the lack of available data for the rare, small-volume, ocean island basalt (OIB)-like mafic rocks that can shed insights into this geological event. We have confirmed that Early Cenozoic OIB-like basalts in the Zhongba area, southern Tibet, were closely related to this magmatic flare-up, which occurred in response to deep mantle geodynamics. In this study, we present detailed geochronological and geochemical data for the Zhongba basalts. These Eocene (ca. 52 Ma) OIB-like basalts have negative K, Zr, Hf, and Ti anomalies, low Fe/Mn and high Fe/Zn ratios, and uniform and enriched Sr-Nd-Hf and HIMU-like Pb isotopic compositions (Sr-87/Sr-86((i)) = 0.7052-0.7053; epsilon Nd-(t) = - 1.7 to - 1.3; epsilon Hf-(t) = - 1.1 to - 0.3; Pb-206/Pb-204 = 19.83-19.87), indicative of derivation from carbonated peridotite. Based on the regional tectonic evolution, we propose that the carbonated peridotite source of the Zhongba basalts was generated by the reaction between depleted mid-ocean ridge basalt-like mantle peridotite and melts from subducted Neo-Tethys carbonate-bearing oceanic crust. This carbonated peridotite was possibly preserved at the thermal boundary between the lithosphere and asthenosphere and underwent partial melting to produce the Zhongba basalts in response to slab break-off of the Neo-Tethys oceanic lithosphere at ca. 52 Ma. The slab break-off triggered the magmatic flare-up and other geological processes (e.g., a decrease in the velocity of the Indian Plate) in southern Tibet during the Eocene. |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:000906702600001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/71395]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 通讯作者 | Chen, Jianlin |
| 作者单位 | 1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China 2.CAS Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China |
| 推荐引用方式 GB/T 7714 | Lei, Ming,Chen, Jianlin,Wang, Dan,et al. An early Eocene magmatic event in southern Tibet triggered by oceanic slab break-off: evidence from ocean island basalt-like mafic rocks[J]. CONTRIBUTIONS TO MINERALOGY AND PETROLOGY,2023,178(1):17. |
| APA | Lei, Ming,Chen, Jianlin,Wang, Dan,Luo, Ying,&Liu, Yixin.(2023).An early Eocene magmatic event in southern Tibet triggered by oceanic slab break-off: evidence from ocean island basalt-like mafic rocks.CONTRIBUTIONS TO MINERALOGY AND PETROLOGY,178(1),17. |
| MLA | Lei, Ming,et al."An early Eocene magmatic event in southern Tibet triggered by oceanic slab break-off: evidence from ocean island basalt-like mafic rocks".CONTRIBUTIONS TO MINERALOGY AND PETROLOGY 178.1(2023):17. |
入库方式： OAI收割
来源：广州地球化学研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。