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Microfauna- and sedimentology-based facies analysis for palaeolandscape reconstruction in the back-barrier area of Norderney (NW Germany)
Netherlands Journal of Geosciences ( IF 1.6 ) Pub Date : 2021-02-19 , DOI: 10.1017/njg.2020.16
Annastasia Elschner , Juliane Scheder , Friederike Bungenstock , Alexander Bartholomä , Thorsten M Becker , Ruggero M Capperucci , Dirk Enters , Martina Karle , Frank Schlütz , Achim Wehrmann , Gösta Hoffmann

Palaeolandscape reconstructions at the German North Sea coast are essential for the understanding of coastal changes and dynamic landscape-forming processes. This study contributes to reconstructing Holocene coastal changes in the back-barrier area of the East Frisian island of Norderney and draws conclusions on the local palaeogeography. Five sediment cores were analysed in terms of sedimentology (grain-size distribution), geochemistry (TOC, TIC, N, C/N), microfauna (foraminifers and ostracods) and 13 radiocarbon dates. In order to identify driving environmental factors and support the facies interpretation, multivariate statistics (PCA) were carried out. Additional cores from the surrounding area (WASA Project and ‘Landesamt für Bergbau, Energie und Geologie’ (LBEG) Hannover) enabled correlation of the investigated cores over a transect of ~6 km, showing six depositional environments, which can be used for landscape reconstruction. Deposition starts with periglacial (aeolian and glaciofluvial) Pleistocene sediments, with subsequent pedogenesis followed by swamp conditions that develop into a salt marsh. The overlying tidal-flat sediments are partially cut by (fossil and recent) channel deposits. A hiatus at the base of the tidal-flat deposits that spans some 3000 years hints at their reworking caused by a combination of antrophogenic coastal protection measures and the impact of storms. Furthermore, based on the profile correlation and the age data, a widespread salt-marsh area with a minimum age of ~4000 cal BP is defined for the ‘Hohes Riff’ in the southwestern back-barrier of Norderney Island.

中文翻译:

基于微动物群和沉积学的相分析,用于 Norderney(德国西北部)后屏障区的古景观重建

德国北海沿岸的古景观重建对于了解海岸变化和动态景观形成过程至关重要。本研究有助于重建东弗里斯兰诺德尼岛后屏障区全新世海岸变化,并得出当地古地理结论。根据沉积学(粒度分布)、地球化学(TOC、TIC、N、C/N)、微型动物(有孔虫和介形虫)和 13 个放射性碳年代,分析了五个沉积物岩心。为了识别驱动环境因素并支持相解释,进行了多元统计(PCA)。来自周边地区的其他岩心(WASA 项目和“Landesamt für Bergbau, Energie und Geologie” (LBEG) Hannover)能够在约 6 公里的横断面上对所研究的岩心进行关联,显示了六种沉积环境,可用于景观重建。沉积始于冰缘(风成和冰川河流)更新世沉积物,随后是成土作用,随后是沼泽条件,发展成盐沼。上覆的潮滩沉积物被(化石和最近的)河道沉积物部分切割。跨越约 3000 年的潮滩沉积物底部的中断暗示它们的改造是由人工海岸保护措施和风暴的影响共同造成的。此外,根据剖面相关性和年龄数据,在诺德尼岛西南后障的“Hohes Riff”中定义了一个最小年龄约为 4000 cal BP 的广泛盐沼区。沉积始于冰缘(风成和冰川河流)更新世沉积物,随后是成土作用,随后是沼泽条件,发展成盐沼。上覆的潮滩沉积物被(化石和最近的)河道沉积物部分切割。跨越约 3000 年的潮滩沉积物底部的中断暗示它们的改造是由人工海岸保护措施和风暴的影响共同造成的。此外,根据剖面相关性和年龄数据,在诺德尼岛西南后障的“Hohes Riff”定义了一个最小年龄约为 4000 cal BP 的广泛盐沼区。沉积始于冰缘(风成和冰川河流)更新世沉积物,随后是成土作用,随后是沼泽条件,发展成盐沼。上覆的潮滩沉积物被(化石和最近的)河道沉积物部分切割。跨越约 3000 年的潮滩沉积物底部的中断暗示它们的改造是由人工海岸保护措施和风暴的影响共同造成的。此外,根据剖面相关性和年龄数据,在诺德尼岛西南后障的“Hohes Riff”中定义了一个最小年龄约为 4000 cal BP 的广泛盐沼区。上覆的潮滩沉积物被(化石和最近的)河道沉积物部分切割。跨越约 3000 年的潮滩沉积物底部的中断暗示它们的改造是由人工海岸保护措施和风暴的影响共同造成的。此外,根据剖面相关性和年龄数据,在诺德尼岛西南后障的“Hohes Riff”中定义了一个最小年龄约为 4000 cal BP 的广泛盐沼区。上覆的潮滩沉积物被(化石和最近的)河道沉积物部分切割。跨越约 3000 年的潮滩沉积物底部的中断暗示它们的改造是由人工海岸保护措施和风暴的影响共同造成的。此外,根据剖面相关性和年龄数据,在诺德尼岛西南后障的“Hohes Riff”中定义了一个最小年龄约为 4000 cal BP 的广泛盐沼区。
更新日期:2021-02-19
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