High-resolution sequence stratigraphy of stacked fan delta sequences, Corinth Rift, Greece

构造作用、沉积物供应和海平面上升对可容纳能力变化的影响往往难以理清。在这方面，扇三角洲很有价值，因为它们是大陆-海洋(或湖泊)转换周围沉积变异性的敏感记录器。在这里，我们提出了一项初步研究，旨在对从盆地边缘(陆架)到盆地中心的沉积序列进行识别、对比和高分辨率测年。为此，科林斯湾的上-更新世扇三角洲序列是非常合适的，因为它们相对较小，可很好地访问，并能够很好地与整个三角洲-前三角洲断面进行视觉对比。砾岩三角洲顶层的淹没或淹没阶段将通过胶结物成分和地层的阴极柱谱分析来识别。通过伽马能谱、粘土组分和孢粉相的X射线衍射分析，研究了前三角洲相沉积层序的表现。这些方法的结果可以作为米兰科维奇旋回性、气候变异性或大陆影响的替代物。据推测，顶层和前三角洲层序的性质及其相互关系将为控制沉积物供应和可容变化提供重要信息。我们的结果将被纳入概念层序地层学框架。

The effects of tectonism, sediment supply and eustacy on accommodation changes are often difficult to untangle. In this aspect fan deltas are valuable because they are sensitive recorders of depositional variability around the continental-marine (or lacustrine) transition. Here we propose a pilot study that is aimed at the recognition, correlation and high-resolution dating of depositional sequences from basin margin (shelf) to basin centre. For this purpose the Plio-Pleistocene fan delta successions in the Gulf of Corinth are highly appropriate since they are relatively small, well accessible and enable good visual correlations of the entire delta-to-prodelta transect. Drowning or submergence phases of conglomeratic delta topset beds will be detected through cathodolumiscence analyses of the cement composition and –stratigraphy. The expression of depositional sequences in the pro-delta facies will be studied by means of gamma-ray spectrometry, XRD analysis of the clay fraction and palynofacies. The results of these methods can be used as proxies for Milankovitch cyclicity, climatic variability, or the continental influence. It is supposed that the nature of the topset- and prodelta sequences and their correlation will give important information on controls on sediment supply and accommodation changes. Our results will be incorporated into a conceptual sequence stratigraphic framework.