Bifurcation of mantle plumes by interaction with stagnant slabs in the mantle transition zone: Evidence from late Cenozoic basalts within Southeast Asia
文献类型：期刊论文
| 作者 | Yang, Fan1,2; Huang, Xiao-Long1,2; Xu, Yi-Gang1,2; He, Peng-Li1,2 |
| 刊名 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN
 |
| 出版日期 | 2023-09-01 |
| 卷号 | 135期号:9-10页码:2710-2720 |
| ISSN号 | 0016-7606 |
| DOI | 10.1130/B36558.1 |
| 英文摘要 | Mantle plumes can encounter stagnant slabs in the mantle transition zone (MTZ) during their ascent from the lower mantle to Earth's surface. However, the interactions between stagnant slabs and mantle plumes remain poorly understood. This study presents new data on the spatial thermal-lithological-chemical heterogeneity in the mantle over a vast area of Southeast Asia that reflects the variable influence of a late Cenozoic mantle plume. Site U1433 of International Ocean Discovery Program (IODP) Expedition 349 in the southwest sub-basin of the South China Sea (SCS) is located near the center of this seismically imaged mantle upwelling. This area also contains midocean ridge basalt (MORB) derived from a peridotite-dominated and normal temperature mantle source with a depleted Nd-Hf and enriched Pb-207/Pb-206 isotopic composition. In contrast, MORB from Site U1431 of IODP Expedition 349 within the eastern sub-basin of the SCS and other intraplate basalts from the Hainan-Leizhou area, the eastern Indochina block, and elsewhere in the SCS are dominantly sourced from higher temperature pyroxenite-enriched mantle material that records mantle plume activity. These observations are in contrast with previous models involving a single plume rising from the lower mantle beneath the SCS that then tilted toward Hainan Island, China. Instead, it is likely that the observations from this region are indicative of plume-stagnant slab interaction. The shallow upper mantle beneath Site U1433 has not been influenced by a mantle plume as the presence of stagnant slabs within the MTZ prevented further upwelling of the plume. In contrast, a mantle plume passed through the weaker MTZ within the eastern sub-basin and circum-SCS areas, allowing plume-related magmatism to occur. The bifurcation of a deep-rooted mantle plume by stagnant slabs in the MTZ produced a cluster of small mantle upwellings that ascended to shallow depths, consistent with new multiscale global tomographic data for Southeast Asia. |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001101571800030 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/79136]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 通讯作者 | Huang, Xiao-Long |
| 作者单位 | 1.Southern Marine Sci & Engn Guangdong Lab Guangzho, Guangzhou 511458, Peoples R China 2.Chinese Acad Sci, Guangzhou Inst Geochem, CAS Ctr Excellence Deep Earth Sci, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yang, Fan,Huang, Xiao-Long,Xu, Yi-Gang,et al. Bifurcation of mantle plumes by interaction with stagnant slabs in the mantle transition zone: Evidence from late Cenozoic basalts within Southeast Asia[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2023,135(9-10):2710-2720. |
| APA | Yang, Fan,Huang, Xiao-Long,Xu, Yi-Gang,&He, Peng-Li.(2023).Bifurcation of mantle plumes by interaction with stagnant slabs in the mantle transition zone: Evidence from late Cenozoic basalts within Southeast Asia.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,135(9-10),2710-2720. |
| MLA | Yang, Fan,et al."Bifurcation of mantle plumes by interaction with stagnant slabs in the mantle transition zone: Evidence from late Cenozoic basalts within Southeast Asia".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 135.9-10(2023):2710-2720. |
入库方式： OAI收割
来源：广州地球化学研究所
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