Late Quaternary history of the coastal Wahiba Sands, Sultanate of Oman
Late Quaternary history of the coastal Wahiba Sands, Sultanate of Oman
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DOI：
10.1002/jqs.922
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发表时间：
2005-05
影响因子：
2.3
通讯作者：
F. Preusser;D. Radies;Frauke Driehorst;A. Matter
中科院分区：
文献类型：
--
作者：
F. Preusser;D. Radies;Frauke Driehorst;A. Matter
阿曼苏丹国Wahiba海岸沙地的大陆沉积物和地貌特征反映了晚第四纪阿拉伯东南部的环境变化。弱胶结沙丘砂、沙丘间沉积物和海岸沉积物的年代测定采用发光法，以建立沉积动力学变化的绝对年表。测年结果证实了以前的假设，即在全球海平面低的时候，沙子被南风从暴露的大陆架带到阿拉伯半岛。在海岸地区的两个突出的阶段的沙子堆积发生在最后一次盛冰期（LGM）之前和之后。沙丘固结的最后一个重要时期是在全新世早期。然而，在末次冰期和新仙女木期，沙丘似乎没有发生重大的固结。在瓦希巴沙地的北方，这两个时期的特点是大量的沙子沉积。造成这种差异的原因是沿海地区沙丘缺乏养护潜力，这可能是由于海平面低和降水减少造成地下水位低。虽然风成活动的时间反映了干旱到超干旱的条件，但湖泊和成壤改变的沙丘间沉积物表明，由于全新世气候最佳时期季风环流的增加，条件比今天更潮湿。版权所有© 2005年约翰威利父子有限公司。
Continental sediments and geomorphological features of the coastal Wahiba Sands, Sultanate of Oman, reflect environmental variability in southeastern Arabia during the late Quaternary. Weakly cemented dune sands, interdune deposits and coastal sediments were dated by luminescence methods to establish an absolute chronology of changes in sedimentary dynamics. The dating results confirm previous assumptions that during times of low global sea level sand was transported by southerly winds from the exposed shelf onto the Arabian Peninsula. Two prominent phases of sand accumulation in the coastal area took place just before and after the last glacial maximum (LGM). A final significant period of dune consolidation is recognised during the early Holocene. However, no major consolidation of dunes appears to have occurred during the LGM and the Younger Dryas. In the northern part of the Wahiba Sands, these two periods are characterised by substantial sand deposition. This discrepancy is explained by the lack of conservation potential for dunes in the coastal area, probably caused by a low groundwater table due to low sea level and decreased precipitation. While the times of aeolian activity reflect arid to hyper‐arid conditions, lacustrine and pedogenically altered interdune deposits indicate wetter conditions than today caused by increased monsoonal circulation during the Holocene climatic optimum. Copyright © 2005 John Wiley & Sons, Ltd.