Tectonic uplift in the forearc of the Hellenic subduction zone from topographic surveying and 36Cl exposure dating of marine terraces on Crete

克里特岛海洋阶地地形测量和 36Cl 暴露测年中希腊俯冲带前弧的构造隆起

• 批准号: 48616152
• 负责人: Professor Dr. Ralf Hetzel
• 金额: --
• 依托单位: Institut für Geologie und Paläontologie
• 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 2011-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/48616152?language=en
• 关键词: Tectonic; uplift; forearc; Hellenic; subduction

Flights of marine terraces – which result from the interaction between rising coastal areas and the fluctuating Quaternary sea level – provide important information on the tectonic deformation at subduction zones. On the island of Crete in the forearc of the Hellenic subduction zone, Late Holocene shorelines were previously used to estimate spatially variable rates of tectonic uplift associated with strong earthquakes. If these uplift rates are representative on longer timescales is still unknown. Information on long-term uplift rates is, however, contained in older marine terraces of Pleistocene age, which have received little attention so far and have not been dated. This pilot study aims to constrain the tectonic uplift rate of eastern Crete, where a series of wave-cut platforms of Pleistocene age is particularly well developed in massive limestones. A detailed topographic survey of the marine platforms combined with 36Cl surface exposure dating will allow (1) to correlate these terraces with Quaternary sea-level highstands and (2) to quantify the long-term uplift rate along the eastern coast of Crete. If successful, this approach could be widely applied to better constrain rates of uplift at the coasts of the eastern Mediterranean region, where abundant Mesozoic limestones are uplifted along active fault systems.

海洋阶地的飞行--这是沿海地区上升和第四纪海平面波动相互作用的结果--提供了有关俯冲带构造变形的重要信息。在希腊俯冲带前弧形的克里特岛上，晚全新世海岸线以前被用来估计与强震相关的构造抬升的空间可变速率。这些提升率在更长的时间尺度上是否具有代表性仍是未知的。然而，关于长期隆升速率的信息包含在更新世时代的较老的海相阶地中，到目前为止，这些阶地几乎没有受到关注，也没有确定日期。这项先导性研究旨在限制克里特岛东部的构造抬升速率，那里的更新世一系列断波平台在块状石灰岩中特别发育。对海洋平台进行详细的地形调查，结合36Cl面暴露测年，将允许(1)将这些阶地与第四纪海平面高位相关联，(2)量化克里特岛东海岸的长期隆升速率。如果成功，这种方法可以被广泛应用于更好地限制地中海东部海岸的隆升速度，那里有丰富的中生代石灰岩沿着活动的断裂系统隆起。