Uppermost mantle velocity from Pn tomography in the Gulf of Aden-猫眼课题宝

DOI：

10.1130/ges01052.1

发表时间：

2013-04

期刊：

Geosphere

影响因子：

2.5

通讯作者：

中科院分区：

地球科学2区

文献类型：

作者：

J. Corbeau;J. Corbeau;F. Rolandone;F. Rolandone;S. Leroy;S. Leroy;A. Al-Lazki;A. Al-Lazki;A. Stork;D. Keir;G. Stuart;J. Hammond;C. Doubre;Jérôme Vergne;Abdulhakim Ahmed;K. Khanbari

通过反演上地幔高频纵波传播时，确定了亚丁湾及其边缘岩石圈地幔地震速度的横向变化。这项研究的数据是由几个临时地震台网和全球目录收集的。采用最小二乘层析算法求解地幔岩石圈的速度变化。为了区分浅层和深层结构，我们对较短和较长的射线路径数据使用单独的反演。高Pn速度（8.2-8.4 km/s）在也门下方的最上层地幔中被观测到，这可能与亚丁和红海火山边缘的岩浆底板的存在有关。低速带（7.7 km/s）存在于萨那、亚丁、阿法尔和亚丁湾下面的浅层上地幔中，这可能与岩石圈的熔融运输有关，岩石圈为活火山活动提供了食物。在阿曼边缘下的上地幔深处，有一个低速带（7.8千米/秒），表明这是一个熔体堆积的深层区。研究结果表明，软流层经历了从阿法尔热点沿亚丁和示巴脊向东的通道化流动。

We determine the lateral variations in seismic velocity of the lithospheric mantle beneath the Gulf of Aden and its margins by inversion of Pn (upper mantle high-frequency compressional P wave) traveltimes. Data for this study were collected by several temporary seismic networks and from the global catalogue. A least-squares tomographic algorithm is used to solve for velocity variations in the mantle lithosphere. In order to separate shallow and deeper structures, we use separate inversions for shorter and longer ray path data. High Pn velocities (8.2–8.4 km/s) are observed in the uppermost mantle beneath Yemen that may be related to the presence of magmatic underplating of the volcanic margins of Aden and the Red Sea. Zones of low velocity (7.7 km/s) are present in the shallow upper mantle beneath Sana’a, Aden, Afar, and along the Gulf of Aden that are likely related to melt transport through the lithosphere feeding active volcanism. Deeper within the upper mantle, beneath the Oman margin, a low-velocity zone (7.8 km/s) suggests a deep zone of melt accumulation. Our results provide evidence that the asthenosphere undergoes channelized flow from the Afar hotspot toward the east along the Aden and Sheba Ridges.

Uppermost mantle velocity from Pn tomography in the Gulf of Aden

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