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Crustal variability along the rifted/sheared East African margin: a review
Geo-Marine Letters ( IF 2.1 ) Pub Date : 2021-04-08 , DOI: 10.1007/s00367-021-00690-y
Maren Vormann , Wilfried Jokat

The East African margin between the Somali Basin in the north and the Natal Basin in the south formed as a result of the Jurassic/Cretaceous dispersal of Gondwana. While the initial movements between East and West Gondwana left (oblique) rifted margins behind, the subsequent southward drift of East Gondwana from 157 Ma onwards created a major shear zone, the Davie Fracture Zone (DFZ), along East Africa. To document the structural variability of the DFZ, several deep seismic lines were acquired off northern Mozambique. The profiles clearly indicate the structural changes along the shear zone from an elevated continental block in the south (14°–20°S) to non-elevated basement covered by up to 6-km-thick sediments in the north (9°–13°S). Here, we compile the geological/geophysical knowledge of five profiles along East Africa and interpret them in the context of one of the latest kinematic reconstructions. A pre-rift position of the detached continental sliver of the Davie Ridge between Tanzania/Kenya and southeastern Madagascar fits to this kinematic reconstruction without general changes of the rotation poles.



中文翻译:

沿裂变/剪切东非边缘的地壳变化:回顾

冈瓦纳的侏罗纪/白垩纪扩散形成了北部索马里盆地和南部纳塔尔盆地之间的东非边缘。东西方冈瓦纳和东西方之间最初的运动向后倾斜(倾斜),但后来东贡瓦纳从157 Ma开始向南漂移,沿着东非形成了一个主要的剪切带,即戴维断裂带(DFZ)。为了记录DFZ的结构变异性,在莫桑比克北部获得了几条深地震线。这些剖面清楚地表明了剪切带的结构变化,从南部的高架大陆块(南纬14°–20°S)到北部的高达6公里厚的沉积物(9°–13)所覆盖的未升高的基底°S)。这里,我们收集了东非沿线五种剖面的地质/地球物理知识,并在最新的运动学构造之一的背景下对其进行了解释。坦桑尼亚/肯尼亚和马达加斯加东南部之间的戴维岭分离大陆片的裂谷前位置与这种运动学重建相吻合,而旋转极点没有发生总体变化。

更新日期:2021-04-08
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