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RHUM-RUM (Réunion Hotspot and Upper Mantle & Réunions Unterer Mantel): Seismological imaging of a mantle plume under La Réunion, western Indian Ocean

RHUM-RUM（留尼汪热点和上地幔

基本信息

批准号：
207475088
负责人：
Professor Dr. Heiner Igel
金额：
--
依托单位：
Alfred-Wegener-Institut (AWI) Helmholtz-Zentrum für Polar- und Meeresforschung
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2012
资助国家：
德国
起止时间：
2011-12-31 至 2016-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/207475088?language=en
关键词：
RHUM RUM union Hotspot Upper

项目摘要

The island of La Réunion is one of the most active and long-lived volcanoes in the world. Its well-dated, 5500-km long hotspot track emerges from the Deccan Traps of India, one of the largest flood basalt provinces on earth, which had a massive impact on global climate and life when they erupted. We want to establish the heat source and "plumbing system" that has been fueling this powerful hotspot for 65 million years: Is there a conduit into the deepest mantle (2900 km deep), directly heated by earth's molten core? Is there a connection to the African Superswell at mid-mantle depths? Or could the Réunion hotspot represent a much shallower mechanism? The goal of the RHUM-RUM experiment is to seismically image a mantle plume - or lack of plume - from the surface down to the core-mantle boundary, and to understand the results in terms of material and heat flow. This comprises vertically ascending flow in the plume conduit, as well as any lateral flow spreading into the upper mantle of the western Indian Ocean. We will investigate the long-standing hypothesis that an asthenospheric channel from La Réunion feeds the Central Indian Ridge at 1500 km distance ("plume-ridge interaction"). RHUM-RUM is a German-French collaboration. Jointly we want to deploy 57 ocean-bottom seismometers and 27 land stations over an area of 2000 x 2000 km², making this the largest ocean plume imaging project to date. The data will be analyzed using the most modern, waveform-based imaging methods in seismology.

留尼旺岛是世界上最活跃和寿命最长的火山之一。它的5500公里长的热点轨迹来自印度的德干陷阱，这是地球上最大的玄武岩地区之一，当它们爆发时，对全球气候和生命产生了巨大的影响。我们想确定6500万年来一直为这个强大的热点提供燃料的热源和“管道系统”：是否有一个管道进入最深的地幔（2900公里深），直接由地球熔融的核心加热？是否有一个连接到非洲超级井在中地幔深度？或者留尼汪热点代表了一种更浅的机制？RHUM-RUM实验的目标是对从地表到地核-地幔边界的地幔柱（或缺乏地幔柱）进行地震成像，并从物质和热流方面了解结果。这包括羽流管道中的垂直上升流，以及扩散到西印度洋上地幔的任何横向流。我们将调查长期存在的假设，即来自留尼旺岛的软流层通道在1500公里的距离上为中印度洋脊提供食物（“地幔柱-脊相互作用”）。RHUM-RUM是德国和法国的合作项目。我们希望在2000 x 2000平方公里的区域内共同部署57个海底地震仪和27个陆地站，使其成为迄今为止最大的海洋羽流成像项目。将使用地震学中最现代的基于波形的成像方法分析数据。