L. Amon, L. Saarse, J. Vassiljev, A. Heinsalu, S. Veski
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引用次数: 9
摘要
本研究确定了Pandivere高地的消冰年代学,总结了爱沙尼亚东北部晚冰期植被的变化趋势。多代理研究包括加速质谱14C测年、植物宏观化石、磁化率、着火损失和湖泊沉积物粒度分布数据,这些数据来自一个以前未发表的研究地点(Kursi),该研究结合该地区五个以前发表的研究地点讨论了结果。结果表明,pandiwe高地的消冰作用开始于14 200 cal. yr BP,结束于13 800 cal. yr BP。冰退缩速率约为1.8 m年-1。根据这些新的放射性碳年代,波罗的海冰湖A1阶段在大约13800 calybp之前淹没了爱沙尼亚的北部和西部无冰区。爱沙尼亚东北部晚冰期植被类型以冻土带为主,灌木种类在不同地区存在差异。该地区直到全新世都没有树木。
Timing of the deglaciation and the late-glacial vegetation development on the Pandivere Upland, North Estonia
In this study, the deglaciation chronology of the Pandivere Upland is defined, and the late-glacial vegetation trends of north-eastern Estonia are summarised. The multi-proxy study includes accelerated mass spectrometry 14C dating, plant macrofossil, magnetic susceptibility, loss-on-ignition and grain-size distribution data of the lacustrine sediment record from one previously unpublished study site (Kursi), and the study discusses the results in combination with five previously published study locations from the area. The results indicate that the deglaciation of the Pandivere Upland started at approximately 14 200 cal. yr BP and was completed by 13 800 cal. yr BP. The ice recession rate was approximately 180 m yr-1. Based on these new radiocarbon dates, the Baltic Ice Lake stage A1 submerged the northern and western ice-free areas of Estonia by ca. 13 800 cal. yr BP. The prevalent vegetation type in north-eastern Estonia during the late-glacial period was tundra with local variations in the dominant shrub species. The region remained treeless until the Holocene.
期刊介绍:
Bulletin of the Geological Society of Finland (BGSF) publishes research articles and short communications in all branches of geosciences. Contributions from outside Finland are welcome, provided that they contain material relevant to Finnish geology or are of general interest.