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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 >Kinematics of the Danakil microplate
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Kinematics of the Danakil microplate

机译：Danakil微孔板的运动学

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摘要

A refinement and extrapolation of recent motion estimates for the Danakil microplate, based on ancient kinematic indicators in the Afar region, describes the evolution of a microplate in the continental realm. The Danakil horst is an elevated part of this microplate, exposing a Precambrian basement within the Afar depression, the site of the Nubia-Somalia-Arabia triple junction. We compare evidence for strike- or oblique-slip faults in data from the Afar depression and southern Red Sea to small circles about published poles of rotation for the Danakil microplate with respect to Nubia. A reconstruction about the preferred pole reunites lengths of a Precambrian shear zone on the Nubia and Danakil sides and preserves a uniform basement fabric strike through Nubia, Danakil and Yemen. Since at least magnetic chron C5 (～11 Ma) Danakil rotated about a different pole with respect to Nubia than either Somalia or Arabia, but between chrons C5 and C2A Nubia-Danakil motion was a close approximation to Nubia-Somalia motion. Since C2A relative motions of the Danakil microplate have been independent of movements on any of the neighbouring plate boundaries. We relate this to the onset of oceanic-type accretion within Afar. The resulting eastwards acceleration of Danakil was accommodated by westwards propagation of the Gulf of Aden rift that became the new, discrete, plate boundary between the Danakil microplate and the Somalia plate. Present-day activity suggests that the Red Sea and Aden rifts will link through Afar, thereby isolating the Danakil horst as a microcontinent on the Arabian margin.
机译：根据阿法尔地区的古代运动学指标，对达纳基尔（Danakil）微孔板的最新运动估计值进行细化和外推，描述了微孔板在大陆领域的演变。 Danakil霍斯特（Danakil horst）是该微孔板的高架部分，暴露了Afar凹陷（努比亚-索马里-阿拉伯三联结的地点）内的前寒武纪基底。我们比较了从阿法尔凹陷和南部红海到小圆形的数据中走滑或倾斜滑移断层的证据，有关丹纳基尔微孔板相对于努比亚的旋转极点已发表。关于首选极点的重构会重新组合努比亚和达纳基尔侧上的前寒武纪剪切带的长度，并保留贯穿努比亚，达纳基尔和也门的均匀基底织物走向。由于至少C5（〜11 Ma）磁性年代，Danakil相对于努比亚绕着与索马里或阿拉伯不同的磁极旋转，但是在C5和C2A之间，Nubia-Danakil运动近似于Nubia-Somalia运动。由于C2A，Danakil微孔板的相对运动独立于任何相邻孔板边界上的运动。我们将此与阿法尔地区海洋型增生的发生有关。 Danakil向东的加速作用被亚丁湾裂谷的向西传播所适应，该裂谷成为Danakil微孔板和索马里板块之间新的，离散的板块边界。当前的活动表明，红海和亚丁裂谷将通过阿法尔连接起来，从而将达纳基尔霍斯特隔离为阿拉伯边缘的一个微大陆。

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