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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 >Two-stage Red Sea rifting inferred from mantle earthquakes in Neoproterozoic lithosphere
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Two-stage Red Sea rifting inferred from mantle earthquakes in Neoproterozoic lithosphere

机译：两阶段红海徘徊从内科特罗古代岩石岩层的地幔地震推断出来

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We use earthquake geothermometry, measured heat flow, and structural constraints from P-wave receiver functions to model the thermal evolution of the lithosphere beneath Harrat Lunayyir. We suggest that the lithosphere thinned to its present 60-km thickness in a second stage of lithospheric thinning at 15-12 Ma following initial Red Sea extension at similar to 27 Ma. Harrat Lunayyir is an active volcanic field located in the Arabian Shield 150 km east of the Red Sea rift axis. In the lithospheric mantle beneath Harrat Lunayyir we locate 64 high-frequency earthquakes at depths of 42-48 km, all with m(L) = 2.5. These brittle-failure earthquakes must have nucleated at relatively low temperatures, based upon global maximum nucleation depths and temperature-dependent-deformation experimental results. Therefore, the mantle earthquakes show that the upper mantle lithosphere is not in thermal equilibrium with the shallow (60 km) underlying asthenosphere. Our thermal modeling indicates that the lithosphere beneath Harrat Lunayyir thinned to its current 60-km thickness at 12 +/- 2 Ma, as constrained by thermal modeling of: (1) surface heat-flow; (2) the depth to the mid-crustal brittle-ductile transition, and (3) the depth to the upper-mantle brittle-ductile transition. Published by Elsevier B.V.
机译：我们使用来自P波接收器的地震地质测定，测量的热流和结构约束，以模拟Harrat Lunayyir下岩石圈的热演变。我们建议在初始红海延伸之后，在初始红海延伸之后，岩石圈在岩石中稀薄的第二阶段厚度薄薄，在初始红海延伸，类似于27 mA。 Harrat Lunayyir是一座活跃的火山岩，位于阿拉伯盾牌上，在红海裂口轴以东150公里。在Harrat Lunayyir下面的岩石树木地幔中，我们在42-48公里处定位了64个高频地震，全部与M（l）＆ = 2.5。基于全球最大成核深度和温度依赖性变形实验结果，这些脆性破坏地震必须在相对低的温度下核。因此，地幔地震表明上部地幔岩石圈并不与浅层（60 km）潜在的近似浮肿的热均衡。我们的热建模表明，Harrat Lunayyir下的岩石圈在12 +/- 2 mA的目前的60公里厚度上变薄，如热模型所限制：（1）表面热流; （2）中地壳脆性转换的深度，和（3）深度到上幔脆性转换的深度。由elsevier b.v出版。

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