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Salt tectonics on the Angolan margin, synsedimentary deformation processes

机译：安哥拉边缘的盐构造，同沉积变形过程

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摘要

Seismic data from the Angolan margin and laboratory experiments on brittle-ductile models are used to study thin-skinned deformation above the salt at margin scale, which is characterized by extension upslope and contraction downslope. The initial geometry of the salt basin was wedging out, both landward and seaward, and the salt was entirely covered by sediments at the onset of gravity-driven deformation. Downslope contraction is accommodated by upslope extension. The upslope extensional domain is subdivided into three subdomains with (1) sealed tilted blocks, (2) growth fault and rollover systems, and (3) extensional diapirs. We interpret this particular arrangement of extensional structures as directly resulting from variations in mechanical coupling between brittle (sediments) and ductile (salt) layers. The downslope contractional domain is subdivided into three subdomains with (1) diapirs squeezed at late stage, (2) polyharmonic folds and thrust faults developed at early stage, and (3) folds and thrusts developed at late stage. This structural zoning results from the initiation of contraction at a distance from the salt toe and further migration of contraction immediately downslope and upslope.
机译：来自安哥拉边缘的地震数据和脆性-延性模型的实验室实验 被用于研究边缘尺度上盐上方的薄皮形变 ，其特征是扩展 上坡和收缩下坡。 盐盆地的初始几何形状逐渐向内陆和向海楔入，并且在重力驱动的 盐被沉积物完全覆盖。 sup>变形。下坡收缩通过upslope 扩展来适应。上坡扩展域分为三个子域，其中（1）封闭的倾斜块，（2）增长断层和翻转系统以及（3）扩展直径。我们将 的这种特殊排列方式解释为直接 是由脆性 （沉积物）和韧性（盐）层之间的机械耦合变化导致的。下坡收缩的 域被细分为三个子域，其中（1）在后期压缩了diapirs ，（2）出现了多谐褶皱和逆冲断层 早期，并且（3）褶皱和逆冲在晚期形成。这种结构分区是由距盐趾一定距离处的收缩开始 和紧随下坡和上坡的收缩进一步迁移 导致的。

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  • 来源
    《AAPG Bulletin》 |2004年第11期|00001523-00001544|共22页
  • 作者

    Xavier Fort; Jean-Pierre Brun;

  • 作者单位

    Géosciences Rennes, University of Rennes 1, UMR CNRS 6118, 35042 Rennes Cedex, FranceNorsk Hydro ASA, Oil & Energy, Exploration, N-0246 Oslo, Norwayxavier.fort@hydro.comxavier.fort@univ-rennes1.fr;

    Mobil North Sea Limited Grampian House, GHGW Cubicle 67, Union Row, Aberdeen, AB10 ISA, United Kingdomfrancois.chauvel@exxonmobil.com;

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