Wet plume atop of the flattening slab: Insight into intraplate volcanism in East Asia
文献类型：期刊论文
| 作者 | He, Lijuan |
| 刊名 | PHYSICS OF THE EARTH AND PLANETARY INTERIORS
 |
| 出版日期 | 2017-08-01 |
| 卷号 | 269页码:29-39 |
| 关键词 | Wet Plume Flattening Slab Water Transport Thermal Evolution Intraplate Volcanism |
| DOI | 10.1016/j.pepi.2017.05.015 |
| 英文摘要 | Geophysical observations imply the intraplate volcanism in East Asia is related to dehydration of slab stagnating in the transition zone. To better understand the dynamics of such process, a thermochemical mantle convection model is constructed to simulate numerically the thermal evolution of slab and the transportation of water in the process of slab downgoing, flattening and stagnation. Equation of water transfer is included, and water effects on density and viscosity are considered. Model results indicate the warming of slab by surrounding mantle is rather slow. Water could be successfully dragged into the transition zone if the reference viscosity of the hydrous layer (with initial water of 2 wt%) is higher than 10(17) Pa s and that of mantle is 10(21) Pa s. Wet plumes could then originate in the flat-lying part of the slab, relatively far from the trench. Generally, the viscosity of the hydrous layer governs the initiation of wet plume, whereas the viscosity of the overlying mantle wedge controls the activity of the ascending wet plumes they are more active in the weaker wedge. The complex fluid flow superposed by corner flow and free thermal convection influences greatly the water transport pattern in the upper mantle. Modeling results together with previous modeling infer three stages of water circulation in the big mantle wedge: 1) water is brought into the mantle transition zone by downward subducting slab under some specific thermo-rheological conditions, otherwise water is released at shallow depth near wedge tip; 2) wet plume generates from surface of the flattening slab warmed by surrounding mantle, and 3) water spreads over the big mantle wedge. Wet plume from the flattening Pacific Plate arrives at the lithospheric base and induces melting, which can explain the intraplate Cenozoic volcanoes in East Asia. (C) 2017 Elsevier B.V. All rights reserved. |
| 语种 | 英语 |
| WOS记录号 | WOS:000406571400003 |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/61851]  |
| 专题 | 地质与地球物理研究所_岩石圈演化国家重点实验室 |
| 作者单位 | Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | He, Lijuan. Wet plume atop of the flattening slab: Insight into intraplate volcanism in East Asia[J]. PHYSICS OF THE EARTH AND PLANETARY INTERIORS,2017,269:29-39. |
| APA | He, Lijuan.(2017).Wet plume atop of the flattening slab: Insight into intraplate volcanism in East Asia.PHYSICS OF THE EARTH AND PLANETARY INTERIORS,269,29-39. |
| MLA | He, Lijuan."Wet plume atop of the flattening slab: Insight into intraplate volcanism in East Asia".PHYSICS OF THE EARTH AND PLANETARY INTERIORS 269(2017):29-39. |
入库方式： OAI收割
来源：地质与地球物理研究所
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