Beachrock as sea-level indicator – A case study at the coastline of Oman (Indian Ocean)

Beachrock as sea-level indicator – A case study at the coastline of Oman (Indian Ocean)
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海滩岩石作为海平面指示器 â 阿曼(印度洋)海岸线的案例研究

DOI:
10.1016/j.quascirev.2019.01.003
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发表时间:
2019
影响因子:
4
通讯作者:
Hoffmann
Hoffmann
中科院分区:
地球科学1区
文献类型:
--
作者:
Falkenroth;Schneider;Hoffmann

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未来的海平面变化对全世界沿海社区构成威胁。因此,重建过去相对海平面变化的可靠方法对于预测未来的发展至关重要。滩岩是第四纪古海岸线分布广泛的指标,具有很高的保存潜力。然而,将它们用作海平面指示器在确定海滩岩层相对于古海平面的精确海拔方面面临着挑战。这些信息对于建立海平面指数点至关重要。我们在阿曼东北海岸线的研究区域显示了一组十二个海洋阶地,其高度达到平均海平面以上 500 m。上面的阶地是侵蚀阶地,而最低的三个阶地是沉积阶地。在侵蚀阶地上,海滩岩石是唯一能抵御侵蚀的沉积物覆盖物。然而,在沉积阶地上,滩岩与其他沉积物一起出现,这些沉积物可能是河流、冲积或海洋沉积物。随着隆升和构造活动的持续进行,该地区的沿海开发备受关注。对三个台地的八个露头进行了实地考察和岩相学方法,确定了六个相组合中的八个岩相。我们使用相分析来改进仅使用地貌指标获得的古海平面信息。在这里,我们证明相分析(迄今为止仅适用于砂质沉积物)也适用于砾石为主的系统。这些结果有助于了解沉积环境的局部变化,并有助于重建抬升率。
Future sea level changes are a threat to coastal communities worldwide. Therefore, reliable methods for the reconstruction of past relative sea-level variations are essential to make predictions of future developments. Beachrocks are a widely distributed indicator of Quaternary paleo-coastlines, with a high potential for preservation. Nevertheless, their use as sea-level indicator faces challenges in the determination of the exact elevation of beachrock formation with respect to paleo sea level. This information is crucial to the establishment of a sea-level index point.Our study area on the northeastern coastline of Oman shows a set of twelve marine terraces that reach a height of 500 m above mean sea level. While the upper terraces are erosional, the lowest three are depositional. On the erosional terraces beachrocks are the only sediment-cover that withstood erosion. On the depositional terraces however, beachrocks occur alongside other sediments, which can be fluvial, alluvial, or marine in origin. The coastal development of the area is of high interest as uplift and tectonic activity are ongoing.Fieldwork and petrographic methods on eight outcrops on three terrace levels led to the identification of eight lithofacies in six facies associations. We used facies analysis to improve the information on paleo sea level as derived by the sole use of geomorphological indicators. Here, we demonstrate that facies analysis (so far applied exclusively on sandy deposits) is applicable also to gravel-dominated systems. The results contribute to knowledge on local changes in the depositional environment and help to reconstruct uplift rates.
阿曼东北部地质实地指南
DOI: --
发表时间: 2019
期刊:
影响因子: --
作者:
G. Hoffmann;M. Meschede;A. Zacke;Mohammed Hilal Al Kindi
通讯作者: Mohammed Hilal Al Kindi
DOI: 10.1127/1860-1804/2013/0002
发表时间: 2013
影响因子: 1.1
作者:
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DOI: --
发表时间: 1999
期刊: Geological Society Special Publication
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发表时间: 2013
期刊:
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通讯作者: F. Felletti
海滩层压:性质和起源
DOI: --
发表时间: 1969
期刊:
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作者:
H. Edward Clifton
通讯作者: H. Edward Clifton