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Upper Pleistocene and Holocene stratigraphy in the Kola Peninsula and Northern Karelia (N–W Russia): Marine and glacial units
Quaternary International ( IF 1.9 ) Pub Date : 2020-12-25 , DOI: 10.1016/j.quaint.2020.11.040
Olga Korsakova

Data on litho- and biostratigraphy of major sedimentary sequences and their geochronological records were compiled and summarized to describe the Late Pleistocene–Holocene marine and glacial events in the Kola-Northern Karelia region. In the coastal Kola Peninsula and its inner part, three marine units and two glacial events were identified in the Upper Pleistocene sequences. The first marine unit (Ponoi Beds in the regional stratigraphy) can be definitely referred to the significant Late Pleistocene transgression known as the Boreal in northern Eurasia. Data on the Kola Peninsula show that the warm-water Boreal transgression was longer than the Eemian one in western Europe, comprising at least MIS 5e-d (from 130–120 to 105–100 ka BP) in the White Sea depression and MIS 5e-c (earlier at least 90 ka BP) in the Barents Sea. Forested environments dominated on the Kola Peninsula at that time. The second Interglacial marine unit (Strelna Beds) attributed to the subsequent Belomorian transgression was deposited in relatively cold settings at the final phase of the Mikulinian Interglacial (MIS 5), about 100 to 70–80 ka BP. Adjacent areas were covered with open forest and tundra. The third marine unit referred to the Interstadial Leningrad Group was formed 60–40 ka BP in rather a cold marine reservoir, when the environmental conditions were more severe than now. The Late Pleistocene glacial events are correlated to the Podporozhie and Ostashkov Groups (MIS 4 and 2). The Podporozhian glacial unit seems to be associated with the Barents-Kara Ice Sheet and its melting caused the glacioeustatic transgression in the White Sea during the Leningradian Substage (MIS 3).

During the Late Glacial and Holocene, a periglacial freshwater lake, brackish-water basin and marine reservoir successively appeared in the White Sea depression successively. Two marine events are suggested here based on the key sedimentary sequences from the coastal isolated lake, i.e. the Late Glacial transgression and the early-middle Holocene (Tapes) transgression.



中文翻译:

科拉半岛和北卡累利阿(俄罗斯西北部)的上更新世和全新世地层:海洋和冰川单元

对主要沉积层序的岩石和生物地层数据及其年代学记录进行了汇编和总结,以描述科拉-北卡累利阿地区的晚更新世-全新世海洋和冰川事件。在沿海的科拉半岛及其内部,在上更新世序列中确定了三个海洋单元和两个冰川事件。第一个海相单元(区域地层中的 Ponoi 床)可以明确地指代欧亚大陆北部被称为北方的重要晚更新世海侵。科拉半岛的数据表明,暖水北海侵比西欧的伊米亚海侵时间长,至少包括白海坳陷的 MIS 5e-d(从 130-120 到 105-100 ka BP)和 MIS 5e -c(更早至少 90 ka BP)在巴伦支海。当时森林环境在科拉半岛占主导地位。归因于随后的 Belomorian 海侵的第二间冰期海洋单元(Strelna Beds)在米库林间冰期(MIS 5)的最后阶段沉积在相对寒冷的环境中,大约 100 至 70-80 ka BP。邻近地区覆盖着开阔的森林和苔原。第三个海相单元被称为列宁格勒组间群,是在 60-40 ka BP 形成于一个相当寒冷的海相水库中,当时环境条件比现在更严峻。晚更新世冰川事件与 Podporozhie 和 Ostashkov 群(MIS 4 和 2)相关。Podporozhian 冰川单元似乎与 Barents-Kara 冰盖有关,它的融化导致了列宁弧亚阶 (MIS 3) 期间白海的冰川海侵。

晚冰期和全新世,白海坳陷先后出现了冰缘淡水湖、咸水盆地和海相水库。根据沿海孤立湖的关键沉积序列,这里提出了两个海洋事件,即晚冰期海侵和早中期全新世(带)海侵。

更新日期:2020-12-25
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