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Implications of foreland paleotopography for stratigraphic development in the Eocene distal Alpine foreland basin

机译：前陆古地形学对始新世末期高寒前陆盆地的地层发育意义

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摘要

Although plate flexure exerts a first-order control on facies patterns in foreland basins, the influence of other factors can overprint flexural effects on basin stratigraphy. We examine the influence of preexisting foreland structural elements on paleotopography and sedimentation in the distal Alpine foreland basin in southeastern France. The Eocene Nummulitic Limestone Formation records progressive backstepping of a shallow-marine carbonate ramp at the distal margin during flexurally induced transgression of the European foreland plate. Analysis of paleogeomorphic features preserved along the basal foreland basin unconformity permits reconstruction of paleotopography during early foreland-basin development. The Nummulitic Limestone unconformably onlaps basement in the hanging walls of a set of reverse faults in the foreland plate. The pattern of onlap indicates that the late Eocene land surface comprised a set of structurally controlled basement highs with an estimated relief of up to 500 m at the time of the Nummulitic transgression. Locally, bedrock-confined paleovalleys filled with fluvial conglomerates are preserved along the unconformity surface and indicate that the pre-Tertiary subcrop was exposed subaerially. Subsequent marine transgression took place across a foreland substrate that showed considerable variation in seafloor topography. Erosional and depositional processes adjacent to structural highs created a complex facies mosaic, which overprinted the simple backstepping carbonate-ramp facies succession that is typically associated with distal forelands. Although flexure determines large-scale facies trends, preflexural relief related to foreland structures can exert significant control on smaller scale depositional patterns.
机译：尽管板块挠曲对前陆盆地的相 模式具有一阶控制作用，但其他因素 的影响仍会叠加挠曲作用对盆地地层的影响。我们研究了 在法国东南部阿尔卑斯山前陆 流域中先前存在的前陆构造元素对 古地形和沉积的影响。始新世的硬质灰岩 地层记录了欧洲前陆板块弯曲诱发的 侵入过程中，浅海碳酸盐岩斜坡在远缘的渐进反冲。沿基底前陆盆地不整合面保留的古地貌 特征的分析允许在前陆前盆地 发展的早期重建古地形。在前陆 板块中，一组反向断层的垂悬壁上的成团石灰岩不整合地覆盖了地下室 。重叠模式表明，始新世晚期陆面 包括一组结构受控的基底 高，在 <时估计最大浮雕500 m / sup>罪恶过犯。局部地，沿河不整合面保留了充满河床砾岩的基岩限制的古卵谷，表明第三系次生作物是经南方露头的。随后的海侵发生在 前陆基底上，该基底在海底 地形中显示出很大的变化。与 结构高点相邻的侵蚀和沉积过程形成了一个复杂的相马赛克，叠印了 与 通常相关的简单的反演碳酸盐岩-斜坡相序。前额远端。尽管flexure 决定了大范围的岩相趋势，但与前陆构造相关的 与前陆构造有关的弯曲前释放可以对较小的 规模沉积模式施加显着控制。 / sup>

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  • 来源
    《GSA Bulletin》 |2000年第4期|515-530|共16页
  • 作者

    Sanjeev Gupta; Philip A. Allen;

  • 作者单位

    T. H. Huxley School of Environment, Earth Science and Engineering, Imperial College, RSM Building, Prince Consort Road, London SW7 2BP, UK;

    Department of Geology, Trinity College, University of Dublin, Dublin 2, Republic of Ireland;

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