Abstract The Tihamat-Asir area is located in southwest Saudi Arabia between the Asir Mountains and the Red Sea coast. Herein, the Tihamat-Asir area aeromagnetic data are re-interpreted to explain the magmatic activity and related structural interaction between extensional normal and transfer strike-slip faulting. The magnetic anomaly structural interpretation indicates that faulting and related magmatic activities are the main structural features affecting the study area. The magnetic signatures reveal oceanic crust underlying the onshore and offshore western side of the study area, while the eastern side is characterized by a broad, low magnetic anomaly indicative of continental crust. The boundary between the oceanic and continental crusts is not sharp, and represents a transitional zone, characterized by magnetic gradient steepness potentially related to mid-Cenozoic gabbroic plutons and volcanic flows together with normal faults injected by Cenozoic basalts. This zone incorporates three NW striking normal faulting and NE striking transfer strike-slip faulting system intersections, located close to Baysh, Abu Arish, and southwest of Abu Arish. The intersectional interactions between these two faulting systems have resulted in brittle magma-feeding zones that have allowed magma to reach the surface at these localities, and is believed to have resulted from the fracturing process affecting these localities due to the accumulated stress exerted by the movement of the NE strike-slip faults along the normal NW faulting systems and the associated releasing bends. A pull-apart magma-feeding zone is the structural model proposed to explain the interpreted brittle magma feeding zones and the associated magmatic activities in the study area.

中文翻译：

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东南红海裂谷 Tihamat-asir 断层交汇点和岩浆供给区：航磁和构造透视

摘要 提哈马特-阿西尔地区位于沙特阿拉伯西南部阿西尔山脉和红海沿岸之间。在此，对 Tihamat-Asir 地区的航磁数据进行重新解释，以解释伸展正常断层和转移走滑断层之间的岩浆活动和相关结构相互作用。磁异常构造解释表明，断层及相关岩浆活动是影响研究区的主要构造特征。磁性特征揭示了研究区陆上和近海西侧下方的大洋地壳，而东侧的特征是广泛的低磁异常，表明大陆地壳。大洋地壳与大陆地壳的分界不明显，代表一个过渡带，其特点是磁梯度陡峭，可能与中新生代辉长岩和火山流以及新生代玄武岩注入的正断层有关。该带包含三个 NW 走向的正断层和 NE 走向的转移走滑断层系统交叉点，靠近 Baysh、Abu Arish 和 Abu Arish 西南。这两个断层系统之间的交叉相互作用导致了脆弱的岩浆供给带，使岩浆能够到达这些地方的地表，并且据信是由于运动施加的累积应力而影响这些地方的压裂过程造成的NE 走滑断层沿正常 NW 断层系统和相关的释放弯曲。