Geodynamic Evolution of the East African Superplume: Insights From Volcanism in the Western Turkana Basin
文献类型：期刊论文
| 作者 | Cai, Yue4,5; Mana, Sara3; Cox, Stephen E.6; Beck, Catherine C.7; Feibel, Craig2; Hanley, Jean6; Liu, Tanzhuo6; Bolge, Louise6; Hemming, Sidney1,6; Goldstein, Steven L.1,6 |
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
 |
| 出版日期 | 2023-09-01 |
| 卷号 | 128期号:9页码:24 |
| ISSN号 | 2169-9313 |
| 关键词 | African Superplume Ar-40/Ar-39 geochronology lead isotopes neodymium isotopes strontium isotopes mantle plume HIMU EMI East African Rift System (EARS) |
| DOI | 10.1029/2023JB026755 |
| 通讯作者 | Cai, Yue(cai@nigpas.ac.cn) ; Mana, Sara(smana@salemstate.edu) |
| 英文摘要 | There is a consensus that volcanism along the East African Rift System (EARS) is related to plume activities. However, because of our limited knowledge of the local lithospheric mantle, the dynamics of the plume are poorly constrained by magma chemistry. The Turkana Basin is one of the best places to study plume-related volcanism because the lithospheric mantle there is unusually thin. New Ar-Ar geochronology and geochemical data on lavas from western Turkana show that Eocene volcanics have relatively low Pb-206/Pb-204 (<19.1) and high epsilon Nd (>3.78). Their relatively high Ba/Rb (35-78) ratios suggest contributions from the shallow lithospheric mantle. Oligo-Miocene Turkana volcanics have HIMU- and EMI- type enriched mantle signatures with overall lower Ba/Rb ratios, which is consistent with partial melting of plume material. Pliocene and younger Turkana volcanics have low Ba/Rb and Sr-Nd-Pb isotope ratios that resemble those of Ethiopian volcanics with elevated He-3/He-4 ratios. This temporal variation can be reconciled with a layered plume model where an outer layer of ancient recycled oceanic crust and sediment overlies more primitive lower mantle material. Beneath Ethiopia, the outer layer of the plume is either missing or punctured by the delamination of the thicker overlying lithospheric mantle at ca. 30 Ma, an event that would have facilitated the rapid upwelling of the inner portion of the plume and triggered the Ethiopian flood volcanism. The outer layer of the plume may be thicker in the southern EARS, which could explain the occurrence of young HIMU- and EMI-type volcanics with primordial noble gas signatures. |
| WOS关键词 | CONTINENTAL FLOOD VOLCANISM ; PLUME DYNAMICS BENEATH ; UPPER-MANTLE BENEATH ; RIFT SYSTEM ; KENYA RIFT ; LITHOSPHERIC MANTLE ; ISOTOPE SYSTEMATICS ; NORTHERN KENYA ; GEOCHEMICAL EVIDENCE ; CENOZOIC MAGMATISM |
| 资助项目 | We thank Francis Ekai Ikai for his assistance during the fieldwork; Tanya Furman for contributing precious samples to this study and commenting on an early draft of the paper, which greatly improved the manuscript; Isabella Manighetti, Catherine Chauvel, a[EAR-GeoPRISMS 1457293] ; We thank Francis Ekai Ikai for his assistance during the fieldwork; Tanya Furman for contributing precious samples to this study and commenting on an early draft of the paper, which greatly improved the manuscript; Isabella Manighetti, Catherine Chauvel, a[EAR-1714892] ; We thank Francis Ekai Ikai for his assistance during the fieldwork; Tanya Furman for contributing precious samples to this study and commenting on an early draft of the paper, which greatly improved the manuscript; Isabella Manighetti, Catherine Chauvel, a[EAR 2021591] ; NSF ; Columbia Global Centers ; Storke Endowment of the Columbia University Department of Earth and Environmental Sciences[NACOSTI/P/22/17095] ; Turkana Miocene Project (TMP) |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| 出版者 | AMER GEOPHYSICAL UNION |
| WOS记录号 | WOS:001077413700008 |
| 资助机构 | We thank Francis Ekai Ikai for his assistance during the fieldwork; Tanya Furman for contributing precious samples to this study and commenting on an early draft of the paper, which greatly improved the manuscript; Isabella Manighetti, Catherine Chauvel, a ; NSF ; Columbia Global Centers ; Storke Endowment of the Columbia University Department of Earth and Environmental Sciences ; Turkana Miocene Project (TMP) |
| 源URL | [http://ir.nigpas.ac.cn/handle/332004/43167]  |
| 专题 | 中国科学院南京地质古生物研究所 |
| 通讯作者 | Cai, Yue; Mana, Sara |
| 作者单位 | 1.Columbia Univ, Dept Earth & Environm Sci, Palisades, NY USA 2.Rutgers State Univ, Dept Earth & Planetary Sci, New Brunswick, NJ USA 3.Salem State Univ, Dept Geol Sci, Salem, MA 01970 USA 4.Chinese Acad Sci, Ctr Excellence Life & Paleoenvironm, Nanjing, Peoples R China 5.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing, Peoples R China 6.Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY USA 7.Hamilton Coll, Geosci Dept, Clinton, NY USA |
| 推荐引用方式 GB/T 7714 | Cai, Yue,Mana, Sara,Cox, Stephen E.,et al. Geodynamic Evolution of the East African Superplume: Insights From Volcanism in the Western Turkana Basin[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2023,128(9):24. |
| APA | Cai, Yue.,Mana, Sara.,Cox, Stephen E..,Beck, Catherine C..,Feibel, Craig.,...&Goldstein, Steven L..(2023).Geodynamic Evolution of the East African Superplume: Insights From Volcanism in the Western Turkana Basin.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,128(9),24. |
| MLA | Cai, Yue,et al."Geodynamic Evolution of the East African Superplume: Insights From Volcanism in the Western Turkana Basin".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 128.9(2023):24. |
入库方式： OAI收割
来源：南京地质古生物研究所
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。