Stratigraphy and OSL chronology of the Middle–Upper Pleistocene sedimentary sequence and vegetation history during Late MIS6–MIS5e in the Neva Lowland (St. Petersburg region, Russia)

IF 1.9 3区 地球科学 Q3 GEOGRAPHY, PHYSICAL
Maksim V. Ruchkin, Ekaterina S. Nosevich, Mikhail V. Sheetov, Dominik Brill
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引用次数: 0

Abstract

The quarry of the Sverdlov (Etalon) Factory stands out as a unique site in the northwest of the East European Plain since it exposes an almost complete Upper Pleistocene stratigraphic succession. Previous investigations have revealed a sequence of marine sediments deposited during the whole Mikulino Interglacial [Eemian, Marine Isotope Stage (MIS)5e], but the chronology of the Late Pleistocene deposits remains incomplete and requires further update. We present a study of the Middle–Upper Pleistocene units exposed in the Sverdlov Factory quarry by using geological methods, optically stimulated luminescence (OSL) dating and pollen analysis. The lower part of the Sverdlov Factory section comprises glaciomarine/glaciolacustrine varves, which accumulated during degradation of the Late Moscow (Late Saalian, Late MIS6) glaciation and correspond to pollen zone M1 (lower peak of Picea). They are covered by interglacial marine clayey silt that includes all Mikulino regional pollen zones M2–M8. According to a Bayesian model based on K-rich feldspar luminescence ages, the interglacial marine deposition started 133 ± 8 ka ago and ended 109 ± 7 ka ago. The marine sediments are overlain by lacustrine silt with a K-rich feldspar age of 119 ± 7 ka, lacustrine/alluvial sand with plant detritus formed 47–41 ka ago, and lacustrine sand and silt without organic matter accumulated ~39 ka ago. The upper part of the section is composed of subglacial till formed during the Late Valdai (Late Weichselian, MIS2) under the Scandinavian Ice Sheet and glaciolacustrine varved deposits of the Baltic Ice Lake. Two ages were acquired using quartz OSL from these varves, 16.9 ± 1.6 and 15.7 ± 1.0 ka, which are assumed to slightly overestimate the true age.

涅瓦低地(俄罗斯圣彼得堡地区)中-上更新世沉积序列的地层学和OSL年代学以及晚MIS6-MIS5e期间的植被史
斯维尔德洛夫(埃塔隆)工厂采石场是东欧平原西北部的一个独特地点,因为它展示了几乎完整的上更新世地层演替。之前的调查揭示了整个米库利诺间冰期[埃米期,海洋同位素阶段(MIS)5e]沉积的海洋沉积物序列,但晚更新世沉积物的年代学仍不完整,需要进一步更新。我们采用地质学方法、光激发发光(OSL)测年和花粉分析,对斯维尔德洛夫工厂采石场出露的中上更新世单元进行了研究。斯维尔德洛夫工厂地段的下部由冰川矿化岩/冰湖岩溶变质岩组成,这些变质岩是在莫斯科晚期(萨利亚晚期,MIS6 晚期)冰川退化过程中堆积而成的,与花粉区 M1(冰川下峰)相对应。它们被包括所有米库利诺地区花粉区 M2-M8 的冰期海洋粘质粉土所覆盖。根据基于富钾长石发光年龄的贝叶斯模型,冰期海洋沉积始于 133 ± 8 ka 前,结束于 109 ± 7 ka 前。海洋沉积物上覆盖着富钾长石年龄为 119 ± 7 ka 的湖积淤泥、47-41 ka 前形成的含有植物碎屑的湖积/冲积砂以及约 39 ka 前堆积的不含有机质的湖积砂和淤泥。该剖面的上部由斯堪的纳维亚冰盖下的瓦尔代晚期(魏希塞尔晚期,MIS2)形成的冰川下沉积物和波罗的海冰湖的冰川湖积变质沉积物组成。使用石英 OSL 从这些变粒中获得了两个年龄,分别为 16.9 ± 1.6 ka 和 15.7 ± 1.0 ka,假定这两个年龄略微高估了真实年龄。
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来源期刊
Journal of Quaternary Science
Journal of Quaternary Science 地学-地球科学综合
CiteScore
4.70
自引率
8.70%
发文量
82
审稿时长
6-12 weeks
期刊介绍: The Journal of Quaternary Science publishes original papers on any field of Quaternary research, and aims to promote a wider appreciation and deeper understanding of the earth''s history during the last 2.58 million years. Papers from a wide range of disciplines appear in JQS including, for example, Archaeology, Botany, Climatology, Geochemistry, Geochronology, Geology, Geomorphology, Geophysics, Glaciology, Limnology, Oceanography, Palaeoceanography, Palaeoclimatology, Palaeoecology, Palaeontology, Soil Science and Zoology. The journal particularly welcomes papers reporting the results of interdisciplinary or multidisciplinary research which are of wide international interest to Quaternary scientists. Short communications and correspondence relating to views and information contained in JQS may also be considered for publication.
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