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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Constraints for timing of extensional tectonics in the western margin of the Red Sea in Eritrea
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Constraints for timing of extensional tectonics in the western margin of the Red Sea in Eritrea

机译：厄立特里亚红海西缘伸展构造的时间约束

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Recent work on asthenosphere-lithosphere coupling reinforces past observations that active and passive rifting models do not adequately describe real rifts. There remains insufficient knowledge of fundamental controls on rift architecture. In the actively extending Red Sea margin of eastern Eritrea, which lies at the Red Sea/Danakil-Gulf of Aden and the East African rift triple junction zone, the geometry and kinematics of extension are complex and poorly defined due to large data gaps. Extension and sea-floor spreading in both the Red Sea and Gulf of Aden have influenced the Neogene tectonic development of Eritrea but many of the structures have pan-African origins and do not follow normal plate opening geometries. To constrain the rifting history in eastern Eritrea, apatite fission-track thermochronologic data were measured for 22 Pan-African rock samples. Results identify late Oligocene-early Miocene cooling coincident with extension and erosion along the conjugate margin in Yemen. A younger age group, confined to Mt Ghedem, relates to an episode of fault reactivation and dyke injection that began ～10 Ma coincident with rotation of the nearby Danakil block. Initially this was driven by onset of sea-floor spreading in the Gulf of Aden and later, in the Pliocene, aided by northward rifting in the Afar depression concomitant with spreading in the Red Sea. These different processes highlight the complex linkage between different extensional events and rift architecture.
机译：关于软流圈-岩石圈耦合的最新工作加强了以往的观察，即主动和被动裂谷模型不能充分描述真实的裂谷。对裂谷建筑的基本控制知识仍然不足。在厄立特里亚东部活跃的红海边缘（位于亚丁的红海/达纳基尔湾和东非裂谷三交界处），由于大的数据空白，扩展的几何形状和运动学很复杂且定义不清。红海和亚丁湾的延伸和海底扩展影响了厄立特里亚的新近纪构造发展，但许多结构都起源于泛非，并且不遵循正常的板块开口几何形状。为了限制厄立特里亚东部的裂谷历史，对22个泛非岩石样品测量了磷灰石裂变径迹的热年代学数据。结果表明，渐新世晚期-中新世早期冷却与沿也门共轭边缘的伸展和侵蚀相吻合。年龄限制在Mt Ghedem中的一个较年轻的年龄组与断层活化和堤坝注入事件有关，该事件始于约10 Ma，与附近的Danakil区块的旋转同时发生。最初，这是由亚丁湾海底扩散的开始所致，后来是上新世，在阿法尔凹陷向北裂谷的帮助下伴随着红海的扩散。这些不同的过程突显了不同的扩展事件与裂谷构造之间的复杂联系。

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