Deglaciation dynamics of the Scandinavian Ice Sheet in the Salpausselkä zone, southern Finland
Deglaciation dynamics of the Scandinavian Ice Sheet in the Salpausselkä zone, southern Finland
复制标题
芬兰南部萨尔保斯卡地区斯堪的纳维亚冰盖的消融动态
作者：
J. Lunkka;J. Palmu;Anu Seppänen
研究了芬兰南部Salpausselkä地区斯堪的纳维亚冰盖的消融模式。数字高程模型（DEM/LiDAR图像）用于绘制研究区域的冰川冲积层并对其进行分类，并收集了冰再前进和后退阶段及其在新仙女木Salpausselkä区范围内的证据。结果表明，位于芬兰东南部的芬兰湖区冰瓣在新仙女木之前，最有可能在Allerød interstadial（c. 13900 - 12700年前）。这一后退阶段之后是一次再前进，之后第一个Salpausselkä在芬兰湖区冰舌的冰缘前面形成（最大年龄为13300 ±900年前）。随后，冰进一步向北退缩，芬兰湖区冰瓣边缘前的第二Salpausselkä形成，根据OSL年龄测定，在11500年至12000年前。以前的研究表明，类似的退缩和再前进事件芬兰湖区冰瓣没有发生在波罗的海冰瓣西南覆盖的地区。总的来说，结果表明，芬兰湖区冰瓣的冰退缩与挪威斯堪的纳维亚冰盖西翼沿着的当代Allerød interstadial冰退缩事件以及瑞典中部的小冰盖振荡具有相同的量级。
Deglaciation patterns of the Scandinavian Ice Sheet in the Salpausselkä zone, southern Finland were studied. Digital elevation models (DEM/LiDAR‐imageries) were used to map and categorize glacifluvial formations of the study area, and evidence for ice re‐advance and retreat phases and their extent across the Younger Dryas Salpausselkä zone was collected. The results suggest that the Finnish Lake District Ice Lobe, located in SE Finland, retreated a minimum of 60 km north of the proximal side of the present First Salpausselkä ridge prior to the Younger Dryas, most probably during the Allerød interstadial (c. 13 900–12 700 years ago). This retreat phase was followed by a re‐advance after which the First Salpausselkä was formed (maximum age 13 300±900 years ago) in front of the Finnish Lake District Ice Lobe’s ice margin. Subsequently, ice retreated further north and the Second Salpausselkä in front of the Finnish Lake District Ice Lobe margin was formed, according to OSL‐age determinations between 11 500 and 12 000 years ago. Previous research indicates that a similar retreat and re‐advance event to that of the Finnish Lake District Ice Lobe did not take place in the area covered by the Baltic Sea Ice Lobe to the southwest. Overall, the results suggest that the ice retreat of the Finnish Lake District Ice Lobe was of the same magnitude as the contemporary Allerød interstadial ice retreat event along the western flank of the Scandinavian Ice Sheet in Norway and minor ice‐sheet oscillations in central Sweden.
影响因子：
3.3
作者：
Stokes C
通讯作者：
Stokes C