中/晚更新世过渡和末次间冰期波罗的海东部的古水文变化

IF 3.3 1区 地球科学 Q1 GEOGRAPHY, PHYSICAL
Maksim V. Ruchkin , Mikhail V. Sheetov , Ekaterina E. Taldenkova , Zinaida V. Pushina , Varvara I. Dudanova , Yaroslav S. Ovsepyan , Evgeny A. Konstantinov , Ekaterina S. Nosevich , Mark A. Mustafin
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引用次数: 0

摘要

在芬兰湾、拉多加湖、奥涅加湖盆地及其连接海峡内,Mga海存在于中更新世晚期至末次间冰期。利用x射线荧光、碳氮(CN)、粒度、x射线衍射(XRD)分析,以及涅瓦河低地(圣彼得堡地区)Sverdlov工厂段Mikulino (Eemian)和Upper Moscow (Upper Saalian)海洋沉积物的微化石数据(硅藻和底生有孔虫),采用多代理方法追踪了Mga海演化中的古水文变化。此外,利用varve年代学对上莫斯科冰湖/冰湖沉积进行了研究,作为中/晚更新世过渡时期Mga盆地古地理变化的时间约束。结果表明,至少在米库利诺间冰期开始前1100年,咸水就进入了斯堪的纳维亚冰盖外围的冰湖。在LIG之前的约1050年至550年间,盆地被更新,随后再次与海洋相连。在LIG早期,Mga海经历了以含氧为主的近底水半咸淡环境,以Elphidium clavatum为优势种的底栖有孔虫组合贫乏,以及地球化学和岩性指标。硅藻和地球化学数据显示,在栎木区域花粉组合带(RPAZ M4)中部,水体盐度和深度急剧上升。在Carpinus-Picea区(RPAZ M6-7),高水位阶段一直持续到回归开始。海水盐度和深度的增加导致了M5区域底部海洋软体动物的扩散,但由于近底水域缺氧的开始,仅限于少数物种。完全缺氧条件在RPAZ M5末期建立,一直持续到Mikulino间冰期末期,在松林带(RPAZ M8)的前半段出现了短暂的氧合漂移。在RPAZ M8末期或早期瓦尔代(早期魏希塞利亚)初期,Mga盆地变成了淡水盆地。Mga海在演化模式上与晚冰期/全新世波罗的海有许多相似之处。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Paleohydrological changes in the eastern Baltic Sea during the Middle/Late Pleistocene transition and the Last Interglacial
The Mga Sea existed from the latest Middle Pleistocene to the latest Last Interglacial (LIG) within the Gulf of Finland, Lake Ladoga, Lake Onega basins and the connecting straits. Paleohydrological changes in the Mga Sea evolution are traced with a multiproxy approach using X-ray fluorescence, carbon and nitrogen (CN), grain size, X-ray diffraction (XRD) analyses, along with microfossil data (diatoms and benthic foraminifers) for Mikulino (Eemian) and Upper Moscow (Upper Saalian) marine sediments in the Sverdlov Factory section of the Neva Lowland (St. Petersburg region, Russia). In addition, varve chronology is applied to the Upper Moscow glaciomarine/glaciolacustrine deposits as time constraints on paleogeographic changes in the Mga basin during the Middle/Late Pleistocene transition. The results indicate that saline waters entered the glacial lake in the periphery of the Scandinavian Ice Sheet at least 1100 years before the onset of the Mikulino Interglacial. During the period between ∼1050 and 550 years before the LIG, the basin was freshened and became again connected with the ocean afterwards. In the early LIG, the Mga Sea experienced brackish conditions with predominantly oxygenated near-bottom waters indicated by an impoverished benthic foraminiferal assemblage with Elphidium clavatum as dominant species, as well as by geochemical and lithological proxies. Diatom and geochemical data reveal a steep rise in water salinity and depth in the middle of the Quercus regional pollen assemblage zone (RPAZ M4). The highstand phase lasted until regression began in the Carpinus-Picea zone (RPAZ M6-7). The increase in water salinity and depth led to the spread of marine molluscs at the base of RPAZ M5, though limited to a few species due to the onset of hypoxia in near-bottom waters. Fully anoxic conditions were established at the end of RPAZ M5 and persisted till the end of the Mikulino Interglacial, with a brief oxygenation excursion in the first half of the Pinus zone (RPAZ M8). At the end of RPAZ M8 or at the beginning of the Early Valdai (Early Weichselian), the Mga basin became freshwater. The Mga Sea shared much similarity with the Late Glacial/Holocene Baltic Sea in evolution patterns.
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来源期刊
Quaternary Science Reviews
Quaternary Science Reviews 地学-地球科学综合
CiteScore
7.50
自引率
15.00%
发文量
388
审稿时长
3 months
期刊介绍: Quaternary Science Reviews caters for all aspects of Quaternary science, and includes, for example, geology, geomorphology, geography, archaeology, soil science, palaeobotany, palaeontology, palaeoclimatology and the full range of applicable dating methods. The dividing line between what constitutes the review paper and one which contains new original data is not easy to establish, so QSR also publishes papers with new data especially if these perform a review function. All the Quaternary sciences are changing rapidly and subject to re-evaluation as the pace of discovery quickens; thus the diverse but comprehensive role of Quaternary Science Reviews keeps readers abreast of the wider issues relating to new developments in the field.
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