Collaborative Research: Active Rifting Along the Red Sea, Afar Triple Junction and Main Ethiopian Rift: Implications for Continental Rheolology and Lithosphere Dynamics

合作研究：红海沿线的活跃裂谷、阿法尔三重交界处和埃塞俄比亚主要裂谷：对大陆流变学和岩石圈动力学的影响

• 批准号: 0635702
• 负责人: Robert Reilinger
• 金额: --
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-02-01 至 2011-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0635702&HistoricalAwards=false
• 关键词: Collaborative; Research; Active; Rifting; Along

This project is a continuation and extension of a prior NSF-MARGINS effort to use space geodetic techniques, and most importantly GPS observations, to measure directly active rifting processes within the northern and central Red Sea. The project is now extended to include the full Arabia-Nubia-Somalia zone of plate interaction (the Afar Rift-Rift-Rift Triple Junction). The project involves maintaining existing continuous GPS stations (Saudi Arabia, Eritrea, Egypt), repeat observations of existing survey GPS sites, and establishing new continuous GPS stations in Ethiopia, Eritrea, Saudi Arabia, and Yemen. New survey GPS sites are being set and surveyed along the Danakil Block (Eritrea), across the Danakil Depression (Eritrea and Ethiopia), and across the Main Ethiopian Rift. All work is in cooperation with our host-country partners.This research is aimed at clarifying the character of crustal deformation associated with active rifting of the continental lithosphere, particularly as a function of the stage of rifting (from rifting of the continental lithosphere to ocean spreading along the central rift valley). In addition, the observations in the Afar will help constrain magmatic processes beneath the Triple Junction. Other relevant geologic and geophysical observations will be integrated with the geodetic results to constrain models for the mechanics of active crustal deformation. Overall, this research should enhance understanding of the mechanics of rifting, the rheology of the continental lithosphere, the role of magmatic intrusion in driving or localizing rifting processes, and the fundamental mechanical processes responsible for driving plate tectonics.

该项目是先前的NSF-Margins努力的延续和扩展，以使用太空大地测量技术，最重要的是GPS观测，以测量北部和中部红海内直接活跃的裂变过程。现在，该项目扩展到包括板相互作用的整个阿拉伯 - 苏马利亚区（Afar Rift-Rift-Rift-Rift Triple Junction）。该项目涉及维护现有的连续GPS站（沙特阿拉伯，厄立特里亚，埃及），重复观察现有的调查GPS站点，并在埃塞俄比亚，厄立特里亚，沙特阿拉伯和也门建立新的连续GPS站。沿着达纳基尔街区（Eritrea），遍布达纳基尔抑郁症（厄立特里亚和埃塞俄比亚）以及整个埃塞俄比亚主要裂谷的新调查GPS站点正在设置和调查。所有工作都是与我们的寄宿国家合作伙伴合作的。这项研究旨在阐明与大陆岩石圈主动裂变相关的地壳变形的特征，尤其是作为裂变阶段的函数（从将岩石岩的裂开到沿着中央裂谷沿中央裂谷扩散的大陆岩层的裂变）。此外，远处的观察结果将有助于限制三重连接处下方的岩浆过程。其他相关的地质和地球物理观察将与大地测量结果集成，以限制主动地壳变形力学的模型。总体而言，这项研究应增强对裂谷力学的理解，大陆岩石圈的流变，岩浆入侵在驱动或定位裂谷过程中的作用以及负责驱动板块构造板块的基本机械过程。