Plume-slab interaction: The Samoa-Tonga system
Plume-slab interaction: The Samoa-Tonga system
复制标题
DOI：
10.1016/j.pepi.2014.03.003
复制
发表时间：
2014-07-01
影响因子：
2.3
通讯作者：
Hart, S. R.
中科院分区：
文献类型：
--
作者：
Druken, K. A.;Kincaid, C.;Hart, S. R.
俯冲板块附近的地幔柱行为仍然知之甚少，实际上与经典的热点模型有很大的不同。我们使用三维实验室模型研究俯冲驱动的流动如何与附近羽流的变形和扩散有关。结果表明，尽管板驱动流具有热浮力，但对羽流驱动流产生了严重的扭曲，并对羽流物质进行了夹带和被动平流。岩层的下倾沉降最初阻碍了垂直烟羽的上升，而下倾和回倾运动的结合将物质重新分配到整个系统中。由于俯冲引起的流动，地表表达与传统的羽流预期有很大不同。板下沉方式和羽流位置的变化导致了水头和导管融化特征的变化，以及迁移热点的变化。对于萨摩亚-汤加系统，模型预测与提出的羽流物质在俯冲板块周围夹带一致。(C) 2014 Elsevier B.V.版权所有
Mantle plume behavior near subducting plates is still poorly understood and in fact varies significantly from the classical hotspot model. We investigate using 3D laboratory models how subduction-driven flow relates to the deformation and dispersal of a nearby plume. Results show slab-driven flow severely distorts plume-driven flow, entraining and passively advecting plume material despite its thermal buoyancy. Downdip sinking of the slab initially stalls vertical plume ascent while the combination of downdip and rollback sinking motions redistribute material throughout the system. As a consequence of the subduction-induced flow, surface expressions differ significantly from traditional plume expectations. Variations in slab sinking style and plume position lead to a range in head and conduit melting signatures, as well as migrating hotspots. For the Samoa-Tonga system, model predictions are consistent with proposed entrainment of plume material around the subducting plate. (C) 2014 Elsevier B.V. All rights reserved.