白海东北部地区的北冰期(Eemian)迁移:来自Bychye-2断面的多代证据

Quaternary Pub Date : 2024-01-05 DOI:10.3390/quat7010003
E. Taldenkova, Y. Ovsepyan, O. Rudenko, A.YU. Stepanova, H. Bauch
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引用次数: 0

摘要

重建冰期海洋环境有助于我们了解过去的气候变化机制。为了对这一知识体系做出贡献,我们研究了皮约扎河 Bychye-2 段直接覆盖在 Moscovian(Saalian)冰碛上的 455 厘米厚的北冰期(Eemian)海床高分辨率沉积序列。我们分析了研究地点的岩性和微化石(有孔虫、浮游动物、花粉、水生古动物)变化。地层分带是基于当地已确立的区域花粉带,并与西欧花粉带相关联。所研究的海床从 Moscovian 冰川末期(>131 ka)一直堆积到约 119.5 ka。我们将其分为三个连续的阶段:在最初的快速洪积阶段(>131-130.5 ka),海冰覆盖的季节性、相对较深的清新盆地;在最大洪积阶段,海冰覆盖较少的深盆地(130.5-130.25 ka);以及海冰覆盖减少的浅盆地(130.25-119.5 ka)。根据花粉区与其他地点的比较,区域冰期反弹大约始于 130 ka。含有典型波罗的海物种的底栖有孔虫和桡足类的多种暖水集合体出现在回归期,主要是 128-124 ka,从而证明了白海和波罗的海之间相对持久的联系。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Boreal (Eemian) Transgression in the Northeastern White Sea Region: Multiproxy Evidence from Bychye-2 Section
Reconstructing interglacial marine environments helps us understand the climate change mechanisms of the past. To contribute to this body of knowledge, we studied a high-resolution 455 cm-thick sediment sequence of the Boreal (Eemian) marine beds directly overlying Moscovian (Saalian) moraine in the Bychye-2 section on the Pyoza River. We analyzed lithological and microfossil (foraminifers, ostracods, pollen, aquatic palynomorphs) variations at the studied site. Stratigraphical zonation is based on the local and well-established regional pollen zones, correlated with the western European pollen zones. The studied marine beds accumulated from the end of the Moscovian glacial (>131 ka) until ca. 119.5 ka. We distinguished three successive phases: a seasonally sea-ice-covered, relatively deep, freshened basin in the initial rapid flooding stage (>131–130.5 ka); a deep basin in the maximum flooding phase with less extensive sea ice cover (130.5–130.25 ka); and a shallow basin with reduced sea ice cover (130.25–119.5 ka). According to a pollen zone comparison with other sites, the regional glacioisostatic rebound started ca. 130 ka. The diverse warm-water assemblages of benthic foraminifers and ostracods containing typical Baltic Sea species occurred during the regression, mainly 128–124 ka, thus giving evidence for a relatively long-lasting connection between the White and Baltic Seas.
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