Sedimentological evidence of Late Pleistocene Shorelines in Oman

IF 2.6 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Marine Geology Pub Date : 2024-09-30 DOI:10.1016/j.margeo.2024.107407
V. Decker , M. Falkenroth , G. Hoffmann
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Abstract

As the climate crisis intensifies, estimating sea-level rise will become increasingly relevant, in particular assessing changes in the relative sea level in different regions. One key to comprehending global sea-level changes is the study of past sea-level highstands. Many regional studies help refine the reconstruction of paleo sea levels globally. Thus far, the Middle East remains understudied.
This paper presents evidence for Quaternary sea-level variations along the shores of the western Indian Ocean. Eight coastal outcrops along the northern and eastern coasts of Oman are presented in detail. The sedimentological evidence for sea-level highstands varies within the study area. However, in relation to recent sea-level conditions, all of these marine and beach deposits are now found well above the environments where such formations would typically form. Dating the timing of sea-level highstands remains a challenging task within the study area. In different studies, attempts to 14C date samples from that area were unsuccessful, as the time of sediment deposition lies beyond the dating limit of 14C, precluding a Holocene formation of these sediments. Thus, the sediments are regarded as deposits formed during Pleistocene sea-level highstands, presumably during MIS 5e. For some sections, optically stimulated luminescence dating could provide a solution, as igneous source rocks supply quartz and feldspar. This paper aims to localise eight sea-level related outcrops along the Omani coast and depict their potential for future work, which should include dating and elevation measurements. Through this, our work contributes to the ongoing effort to globally identify records of sea-level changes, as well as providing insights into the regional setting in Oman.
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阿曼晚更新世海岸线的沉积学证据
随着气候危机的加剧,估算海平面上升将变得越来越重要,特别是评估不同地区相对海平面的变化。理解全球海平面变化的关键之一是研究过去的海平面高点。许多区域研究有助于完善全球古海平面的重建。本文提供了西印度洋沿岸第四纪海平面变化的证据。本文详细介绍了阿曼北部和东部海岸的八个沿海露头。在研究区域内,海平面高地的沉积学证据各不相同。不过,就最近的海平面状况而言,所有这些海洋和海滩沉积物目前都远高于此类地层通常形成的环境。在研究区域内,海平面高地的时间测定仍然是一项具有挑战性的任务。在不同的研究中,对该地区样本进行 14C 测定的尝试都没有成功,因为沉积物沉积的时间超出了 14C 测定的极限,排除了这些沉积物形成于全新世的可能性。因此,这些沉积物被认为是在更新世海平面高位时期形成的沉积物,推测形成于 MIS 5e。对于某些地段,由于火成岩提供了石英和长石,因此光激发发光测年法可以提供一种解决方案。本文旨在确定阿曼沿海八个与海平面有关的露头的位置,并描绘其未来工作的潜力,其中应包括年代测定和海拔测量。通过这项工作,我们的工作将为目前正在全球范围内确定海平面变化记录的工作做出贡献,并为了解阿曼的区域环境提供见解。
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来源期刊
Marine Geology
Marine Geology 地学-地球科学综合
CiteScore
6.10
自引率
6.90%
发文量
175
审稿时长
21.9 weeks
期刊介绍: Marine Geology is the premier international journal on marine geological processes in the broadest sense. We seek papers that are comprehensive, interdisciplinary and synthetic that will be lasting contributions to the field. Although most papers are based on regional studies, they must demonstrate new findings of international significance. We accept papers on subjects as diverse as seafloor hydrothermal systems, beach dynamics, early diagenesis, microbiological studies in sediments, palaeoclimate studies and geophysical studies of the seabed. We encourage papers that address emerging new fields, for example the influence of anthropogenic processes on coastal/marine geology and coastal/marine geoarchaeology. We insist that the papers are concerned with the marine realm and that they deal with geology: with rocks, sediments, and physical and chemical processes affecting them. Papers should address scientific hypotheses: highly descriptive data compilations or papers that deal only with marine management and risk assessment should be submitted to other journals. Papers on laboratory or modelling studies must demonstrate direct relevance to marine processes or deposits. The primary criteria for acceptance of papers is that the science is of high quality, novel, significant, and of broad international interest.
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