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

希腊科林斯裂谷堆积扇三角洲层序的高分辨率层序地层学

• 批准号: 43434266
• 负责人: Dr. Johan H. ten Veen
• 金额: --
• 依托单位: TNO.NL - Netherlands Institute of Applied Geoscience
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2007
• 资助国家: 德国
• 起止时间: 2006-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/43434266?language=en
• 关键词: resolution; sequence; stratigraphy; stacked; fan

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.

构造运动、沉积物供应和生态平衡对适应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）过渡期间沉积变化的敏感记录者。在这里，我们提出了一项试点研究，旨在对从盆地边缘（陆架）到盆地中心的沉积序列进行识别、关联和高分辨率测年。为此，科林斯湾的上里奥-更新世扇三角洲序列非常合适，因为它们相对较小，易于接近，并且能够使整个三角洲到原三角洲横断面具有良好的视觉相关性。砾岩三角洲顶沉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、粘土组分和孢粉相的 XRD 分析，研究前三角洲相沉积层序的表达。这些方法的结果可以用作米兰科维奇周期性、气候变化或大陆影响的代理。据推测，顶积层序和前三角洲层序的性质及其相关性将为控制沉积物供应和适应变化提供重要信息。我们的结果将被纳入概念层序地层框架中。