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首页> 外文OA文献 >La lithosphère du point triple Aden - Afar - sud mer Rouge et du golfe d'Aden : magmatisme et rupture continentale
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La lithosphère du point triple Aden - Afar - sud mer Rouge et du golfe d'Aden : magmatisme et rupture continentale

机译：亚丁-阿法尔三点岩石圈-南红海和亚丁湾：岩浆作用和大陆破裂

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The Afar triple junction is a unique region that links the Red Sea, the Gulf of Aden and the Ethiopian rift, and where it is possible to study the different stages of continental breakup, from early rifting to seafloor spreading and development of continental passive margins. Extension and magmatic activity are generally thought to be restricted to the active volcanic segments of the rift or to oceanic ridges. However, magmatic activity is also present on the continental margins flanks of the Afar rift, southern Red Sea and Gulf of Aden. The ambient noise tomography and teleseismic body-wave tomography are complementary methods that allow imaging the crust and upper mantle, and help to reveal magmatic systems. Our tomographic studies of the Afar region provide evidence for the presence of complex magmatic systems under the Afar rift flanks, currently modifying the crust and linked with hydrothermal systems near the surface. The emplacement of intruded or under-plated dense magmatic material in the Afar lower crust accommodates the extension outside of the active magmatic segments. In addition, the Red Sea margin flanks in Yemen are affected by magmatism caused by localized small-scale upwellings of mantle material, from a broad abnormally hot mantle zone located beneath Afar and southwestern Yemen. We also suggest the presence of magmatic systems with or without a volcanic expression at the surface, beneath the passive margins shoulders of the eastern Gulf of Aden. We propose that these systems could be fed by small-scale convection caused by lithosphere thickness variations at the edge of the Arabian plate and near the Gulf of Aden main fracture zones.
机译：阿法尔三重交界处是一个连接红海，亚丁湾和埃塞俄比亚裂谷的独特区域，在这里可以研究大陆破裂的不同阶段，从早期裂谷到海底扩散以及大陆被动边缘的发展。通常认为扩展和岩浆活动仅限于裂谷的活动火山段或洋脊。但是，在阿法尔裂谷，红海南部和亚丁湾的大陆边缘两侧也存在岩浆活动。环境噪声层析成像和远震体波层析成像是相辅相成的方法，可以对地壳和上地幔成像，并有助于揭示岩浆系统。我们对阿法尔地区的层析成像研究为阿法尔裂谷侧面下存在复杂的岩浆系统提供了证据，这些岩浆系统目前正在改变地壳，并与地表附近的热液系统有关。阿法尔下部地壳中的侵入岩浆或板下层致密岩浆材料的位置可以容纳活跃岩浆段以外的延伸。此外，也门的红海边缘侧翼受到地幔物质局部上涌的岩浆作用的影响，地幔物质来自位于阿法尔下方和也门西南部的一个广泛的异常高温地幔带。我们还建议在亚丁湾东部边缘被动缘以下的地表存在有或没有火山作用的岩浆系统。我们建议这些系统可以通过阿拉伯板块边缘和亚丁湾主裂缝区附近岩石圈厚度变化引起的小规模对流来提供。

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    Korostelev Felicie;

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  • 年度 2015
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