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

海相阶地的抬升是沿海地区上升与第四纪海平面波动相互作用的结果，为俯冲带的构造变形提供了重要信息。在希腊俯冲带的前弧克里特岛上，晚全新世的海岸线以前被用来估计与强震相关的构造隆起的空间变化率。这些抬升速率在更长的时间尺度上是否具有代表性尚不清楚。然而，关于长期抬升率的资料包含在更新世时代的较老的海洋阶地中，这些阶地迄今很少受到注意，也没有确定年代。这项初步研究旨在限制克里特岛东部的构造抬升速率，在那里，更新世时期的一系列波浪切割台地在大块石灰岩中特别发达。对海洋台地进行详细的地形调查，并结合36Cl表面暴露年代测定，将允许(1)将这些台地与第四纪海平面高点联系起来，(2)量化克里特岛东海岸的长期隆起率。如果成功，这种方法可以广泛应用于更好地限制地中海东部地区海岸的抬升速率，那里丰富的中生代石灰石沿着活动断层系统隆起。

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.