Stratigraphy of the Koivusaarenneva exposure and its correlation across central Ostrobothnia, Finland

IF 1.3 4区 地球科学 Q2 GEOLOGY
J. Lunkka, P. Lintinen, K. Nenonen, P. Huhta
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引用次数: 7

Abstract

A multiple till succession at Koivusaarenneva in Central Ostrobothnia, adjacent to the Gulf of Bothnia, was studied using conventional sedimentological techniques. In addition, a sand-rich unit between two till beds was dated by the Optical Stimulated Luminescence (OSL) method and organic-bearing silt was subjected to pollen analysis. The methods were applied to determine the Pleistocene sedimentation history of the area. The results obtained indicate that the lowest till above the crystalline bedrock at Koivusaarenneva was deposited from the NNW during the Saalian glaciation, whereas the organic-bearing sediments and deformed sand and silt above, were laid down during the Eemian and the Early Weichselian stages. Two till beds above the Early Weichselian sediments indicate that at least two separate Scandinavian Ice Sheet advances took place in the area, most likely in the early Middle Weichselian and the Late Weichselian
芬兰Koivusaarenneva暴露地层及其在Ostrobothnia中部的对比
利用常规沉积学技术,研究了邻近波西尼亚湾的Koivusaarenneva中部的多层系演替。利用光激发光(OSL)法测定了两个耕层之间的富砂单元,并对含有机质粉土进行了花粉分析。应用这些方法确定了该地区更新世沉积史。结果表明,科夫萨阿仑涅娃结晶基岩之上的最低层是在萨辽冰期NNW沉积的,而上面的含有机质沉积物和变形砂粉沉积则是在埃米期和早期魏希塞利期沉积的。早期魏奇塞利世沉积物上方的两个斜坡表明,该地区至少发生过两次独立的斯堪的纳维亚冰盖推进,最有可能发生在中魏奇塞利世早期和晚期魏奇塞利世
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来源期刊
CiteScore
1.30
自引率
0.00%
发文量
5
审稿时长
>12 weeks
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.
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