Middle and Late Holocene relative sea level changes and coastal development at Rugård, Denmark

IF 2.4 3区 地球科学 Q2 GEOGRAPHY, PHYSICAL
Boreas Pub Date : 2023-11-29 DOI:10.1111/bor.12642
Marie Holst Riis, Lasse Sander, Lars Nielsen, Jan-Pieter Buylaert, Amélie Juliette Marie Challier, Nicolaj Krog Larsen
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Abstract

Denmark has been subject to complex interactions of isostatic uplift and eustatic sea level changes since the last deglaciation. Prominent coastal beach ridges as well as lagoonal and lake deposits from this period have been investigated at a number of sites in the region to constrain the relative sea level (RSL) changes. However, despite the common occurrence of former coastal lagoons and lakes in proximity to raised beach ridges, they have rarely been studied in combination. In this study, we use a multiproxy approach including geospatial data, lake sediment coring, ground penetrating radar and optically stimulated luminescence dating to investigate the Holocene coastal evolution and RSL history at Rugård in Mols Bjerge National Park, on the east coast of the Jutland Peninsula. Our results show that the coastal area at Rugård was transgressed between c. 7.6 and 7.0 cal. ka BP and that RSL was ~4.5 m higher than present between c. 6.6 and 5.9 ka ago, when the highest section of the beach ridge plain was deposited. The elevation and timing of this relative highstand are in good agreement with previous estimates of the Littorina transgression and contribute to our combined knowledge about RSL history and coastal evolution in the southern Kattegat. Subsequently, isostatic adjustment has caused uplift and erosion of the beach ridge plain, but renewed progradation and deposition of a lower beach plain have taken place since c. 1740 CE. Our results demonstrate the value of using a multiproxy approach to study RSL changes and coastal evolution.

Abstract Image

丹麦鲁加德中新世和全新世晚期相对海平面变化与海岸开发
自上一次脱冰期以来,丹麦经历了等静力隆升和静力海平面变化的复杂互动。为了确定相对海平面 (RSL) 的变化,在该地区的一些地点对这一时期的突出海岸滩脊以及泻湖和湖泊沉积物进行了调查。然而,尽管在隆起的滩脊附近经常出现前沿海泻湖和湖泊,但很少对它们进行综合研究。在这项研究中,我们采用了包括地理空间数据、湖泊沉积物取芯、地面穿透雷达和光激发发光测年在内的多代理方法,研究了日德兰半岛东海岸莫尔斯比耶日国家公园 Rugård 的全新世海岸演变和 RSL 历史。我们的研究结果表明,Rugård 海岸地区在约公元前 7.6 至 7.0 千年之间被横切,约公元前 6.6 至 5.9 千年之间 RSL 比现在高出约 4.5 米,当时滩脊平原的最高部分被沉积下来。这一相对高地的海拔高度和时间与以前对 Littorina 回归的估计非常一致,有助于我们综合了解 RSL 的历史和卡特加特海峡南部的海岸演化。随后,等静力调整引起了滩脊平原的隆起和侵蚀,但自约公元 1740 年以来,又出现了较低海滩平原的隆升和沉积。我们的研究结果表明,采用多代理方法研究 RSL 变化和海岸演化具有重要价值。
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来源期刊
Boreas
Boreas 地学-地球科学综合
CiteScore
5.90
自引率
4.50%
发文量
36
审稿时长
>12 weeks
期刊介绍: Boreas has been published since 1972. Articles of wide international interest from all branches of Quaternary research are published. Biological as well as non-biological aspects of the Quaternary environment, in both glaciated and non-glaciated areas, are dealt with: Climate, shore displacement, glacial features, landforms, sediments, organisms and their habitat, and stratigraphical and chronological relationships. Anticipated international interest, at least within a continent or a considerable part of it, is a main criterion for the acceptance of papers. Besides articles, short items like discussion contributions and book reviews are published.
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