Late Quaternary development, architecture, and paleoecology of Rasdhoo Atoll, Maldives, Indian Ocean

印度洋马尔代夫拉斯杜环礁的晚第四纪发展、建筑和古生态

• 批准号: 22831428
• 负责人: Professor Dr. Eberhard Gischler
• 金额: --
• 依托单位: Arbeitsgruppe Biosedimentologie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2009-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/22831428?language=en
• 关键词: Late; Quaternary; development; architecture; paleoecology

The aim of the proposed study is to reconstruct the development of the Maldivian atoll of Rasdhoo including its reef islands since the last glacial maximum. As there exists hardly any data on reef and island development in the Maldives during the past several thousand years, it is proposed to drill 10-15 shallow coreholes on the marginal and lagoonal reefs of Rasdhoo atoll down to 25 m below present sea-level using a portable hydraulic drill. The age of corals along the rock cores obtained as well as the rock itself can be determined using the standard C14- and/or U/Th methods. Preferentially, shallow-water corals will be dated with the intention to get a large number of sea-level data from different depths. With these data, it will be possible to evaluate the influence of controlling factors of atoll and island development such as sea-level fluctuations and antecedent topography of the underlying ice-age islands. These data will also allow to make predictions for the future development of reefs and reef islands in the light of global warming and the rise in global sea-level.

拟议研究的目的是重建马尔代夫拉斯胡环礁的发展，包括其礁岛自最后一次冰川极大期以来。由于马尔代夫在过去几千年中几乎没有任何关于珊瑚礁和岛屿发展的数据，因此建议使用便携式液压钻机在Rasdhoo环礁的边缘和泻湖珊瑚礁上钻10-15个浅层岩心孔，深度低于当前海平面25米。可以使用标准的C14-和/或U/Th方法确定沿岩石岩心获得的珊瑚年龄以及岩石本身。我们将优先对浅水珊瑚进行年代测定，以便从不同深度获得大量的海平面数据。有了这些数据，就有可能评价控制环礁和岛屿发展的因素的影响，例如海平面波动和潜在冰期岛屿以前的地形。这些数据也将允许在全球变暖和全球海平面上升的情况下对珊瑚礁和礁岛的未来发展做出预测。