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Last Interglacial changes in sea level on Aldabra, western Indian Ocean
Sedimentology ( IF 2.6 ) Pub Date : 2020-06-08 , DOI: 10.1111/sed.12738
Colin J.R. Braithwaite 1
Affiliation  

The Pleistocene limestones on the island of Aldabra in the western Indian Ocean preserve a detailed record of the Last Interglacial interval. Sedimentological analysis has revealed that this interval, formerly regarded as reflecting rapid sea‐level rise, during global warming, followed by a more gradual fall towards the low sea level of the Last Glacial Maximum, in fact shows much greater variation. Although data do not support an accurate chronology, there is evidence that reversals in sea‐level trend caused both pauses in deposition and concurrent erosion during sea‐level rise, and both stillstands and erosion during sea‐level fall. Data include sea‐level related variations in coral morphology, discontinuities and boundaries within depositional sequences, and changes in biofacies. These may explain inconsistencies in the radiometric ages of deposits within the unit, but question the nature of the interglacial cycle, the mechanisms driving it and, in particular, whether comparable variation occurred elsewhere.

中文翻译:

西印度洋阿尔达布拉海平面的最后一次间冰期变化

印度洋西部阿尔达布拉岛上的更新世石灰岩保存了最后一次间冰期的详细记录。沉积学分析表明,这个区间以前被认为反映了全球变暖期间海平面的快速上升,然后是逐渐下降到末次盛冰期的低海平面,实际上显示出更大的变化。虽然数据不支持准确的年表,但有证据表明,海平面趋势的逆转导致海平面上升期间沉积的暂停和同时发生的侵蚀,以及海平面下降期间的静止和侵蚀。数据包括与海平面相关的珊瑚形态变化、沉积序列中的不连续性和边界以及生物相的变化。
更新日期:2020-06-08
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