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首页> 外文期刊>Boreas >Palaeoenvironment of the Karelian Isthmus, the easternmost part of the Gulf of Finland, during the Litorina Sea stage of the Baltic Sea history
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Palaeoenvironment of the Karelian Isthmus, the easternmost part of the Gulf of Finland, during the Litorina Sea stage of the Baltic Sea history

机译:波罗的海历史的利托里纳海阶段,芬兰湾最东端的卡累利阿地峡的古环境

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摘要

The palaeoenvironment of the Karelian Isthmus area during the Litorina Sea stage of the Baltic Sea history, between 8.0 and 4.5 kyr BP ( 8.8 - 5.2 cal. kyr BP), was reconstructed by studying four sites located on the Karelian Isthmus in Russia. Methods included diatom and pollen analyses, sediment lithostratigraphical interpretation and 14 C dating. The brackish- water ( Litorina) transgression began c. 7.7 kyr BP ( 8.45 cal. kyr BP) in the Karelian Isthmus area. The transgression maximum occurred between 6.7 and 5.7 kyr BP ( 7.6 - 6.5 cal. kyr BP), depending on the glacio- isostatic land uplift rate. Regarding the vegetation, the maximum occurrence of temperate deciduous trees took place at the same time. The transgression was interrupted by a short- lived sea- level standstill during the middle phase of the main transgression, c. 6.3 kyr BP ( 7.2 cal. kyr BP), on the eastern part of the isthmus. The highest Litorina shoreline is located between 8 and 13 m above present sea- level and the amplitude of the Litorina transgression has varied between 5 and 7 m. The 8.2- kyr cold event is not evident, but the sea- level standstill around 6.3 kyr BP ( 7.2 cal. kyr BP) could reflect a cool episode at that time in the Karelian Isthmus area.
机译:通过研究位于俄罗斯卡累利阿地峡上的四个地点,在波罗的海历史的利托里纳海阶段的8.0至4.5年BP(8.8至5.2卡利BP)之间重建了卡累利阿地峡地区的古环境。方法包括硅藻和花粉分析,沉积物岩石地层学解释和14 C测年。咸淡水(Litorina)的侵害开始c。卡累利阿地峡地区为7.7吉尔伯特(8.45 cal。吉尔伯特BP)。越海最大值发生在6.7至5.7 kyr BP(7.6-6.5 cal。kyr BP)之间,具体取决于冰川等静置土地的上升速度。关于植被,同时发生了最多的温带落叶乔木。在主要海啸的中期,海平面短暂的停顿中断了海浪的侵袭。在地峡的东部,海拔6.3千磅(7.2千磅)。最高的Litorina海岸线位于当前海平面以上8至13 m之间,Litorina海侵的幅度在5至7 m之间变化。 8.2年的寒冷事件并不明显,但是海平面停滞在6.3年BP(7.2卡尔BP)附近可能反映了当时卡累利阿地峡地区的一次凉爽事件。

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