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首页> 外文期刊>Tectonophysics: International Journal of Geotectonics and the Geology and Physics of the Interior of the Earth >Post-rift stratigraphic architectures along the African margin of the Equatorial Atlantic: Part I the influence of extension obliquity
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Post-rift stratigraphic architectures along the African margin of the Equatorial Atlantic: Part I the influence of extension obliquity

机译：沿着赤道大西洋非洲边境的裂口后地层建筑：第I部分延伸倾斜的影响

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摘要

We investigated the variability of the first-order crustal structure and early post-rift stratigraphy of six segments of the African Equatorial Atlantic margin using sub-surface data (seismic and wells). Extension obliquity of the segments varies from 0 for the West Ivory Coast and Ghana transform segments to 30 for the Togo-Benin oblique segment and 75 for the East Ivory Coast normally divergent segment. The Sierra Leone and Liberia segments underwent probably deformation during both the early Jurassic rifting of the Central Atlantic and the early Cretaceous rifting of the Equatorial Atlantic with contrasted divergence obliquities. For segments that underwent a single rifting, we show that, the higher the obliquity, the wider the crustal thinning domain. This has a major influence on the first-order geometry of all the post-rift horizons, including the present-day slope: the lower the obliquity, the larger the differential subsidence across the margin and the steeper the present-day slopes of post-rift horizons. This also has a major influence on the flexural isostatic response of the lithosphere to thermal- and erosion/sedimentation- driven (un)loads during the early post-rift. Narrow (transform) segments underwent higher flexural (and/or thermal) uplifts in the proximal domain than wider divergent segments. Along the same margin, divergent segments therefore may preserve early post-rift deposits in their proximal domains, whereas they are not preserved on nearby transform segments.
机译：我们调查了使用子表面数据（地震和井）的非洲赤道大西洋边缘六个部分的一阶地壳结构和早期后裂变地层的可变性。段的延伸倾斜度从西象牙海岸和加纳转变为30段的0，为多哥贝尼宁斜线部门和东象居海岸的75段变化为75个正常发散的细分市场。塞拉利昂和利比里亚段在中西部大西洋的早期侏罗纪河流期间接受了变形，以及赤道大西洋的早期白垩纪河流与对比的发散倾斜度。对于经过单一渔平的段，我们表明，倾斜度越高，地壳稀薄域越宽。这对所有后裂缝地平线的一阶几何体具有重大影响，包括当代坡度：倾斜越低，边缘的微分沉降越大，较陡峭的当天斜坡裂痕视野。这也对裂变后裂缝斜面的抗弯性等静压反应产生了重大影响，在早期裂谷期间的损坏/沉积（UN）负载。窄（变换）段在近端域中进行高弯曲（和/或热）的升高而不是更宽的发散区段。沿着相同的余量，因此，不同的段可以在其近端域中保持早期裂缝沉积物，而它们在附近的变换段中不保留。

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