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

构造运动、沉积物供给和海平面升降对可容纳空间变化的影响往往难以理清。在这方面，扇三角洲是有价值的，因为它们是大陆-海洋（或湖泊）过渡附近沉积变化的敏感记录器。在这里，我们提出了一个试点研究，目的是在识别，对比和高分辨率测年的沉积序列从盆地边缘（大陆架）到盆地中心。为此，科林斯湾的上新世-更新世扇三角洲序列是非常合适的，因为它们相对较小，易于访问，并使整个三角洲到前三角洲断面具有良好的视觉相关性。砾岩三角洲顶积层的淹没或淹没阶段将通过水泥成分和地层学的阴极发光分析来检测。通过伽马能谱、粘土矿物XRD分析和孢粉相分析，研究了前三角洲相沉积层序的表现。这些方法的结果可以用来作为代理米兰科维奇旋回，气候变率，或大陆的影响。据推测，顶置和前三角洲序列的性质和它们的相关性将提供重要的信息控制沉积物供应和可容纳空间的变化。我们的研究结果将被纳入一个概念性的层序地层框架。

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.