. Acta Academiae Aboensis. Science; Mathematics. 50 ARCTIC BASALT PLATEAU maxima of volcanicity, the latter being in high degree dependent on the-depth and number of the dissecting valleys. Comparing the absolute heights of the plateau, and combining them with the migh- tiness of the basalt piles and with the number of separate flows a line may be drawn, which runs from the upper Piasina region in the north to the Tunkin Alps in the south and which may in gene- ral correspond to an axis of the greatest upheaval (fig. 2). This axis of the greatest upheaval coincides to a great extent with the a
. Acta Academiae Aboensis. Science; Mathematics. 50 ARCTIC BASALT PLATEAU maxima of volcanicity, the latter being in high degree dependent on the-depth and number of the dissecting valleys. Comparing the absolute heights of the plateau, and combining them with the migh- tiness of the basalt piles and with the number of separate flows a line may be drawn, which runs from the upper Piasina region in the north to the Tunkin Alps in the south and which may in gene- ral correspond to an axis of the greatest upheaval (fig. 2). This axis of the greatest upheaval coincides to a great extent with the ancient valley depicted above and hence the great development of volcanicity along this line may be Fig. 2. As to the cause of these upheavals the thought of isostatic read- justment lies at hand. Yet there is no distinct region of subsidence in the neighbourhood, that could be taken into consideration as a compensating area, the nearest lying too far away and being separated from the plateau described above by broader zones of tectonical weak- ness. Moreover the uniformity and the flatness of the (northern) area does not favour such a strong and accelerated denudation, as may be expected in areas of uplift. In all, a rhythmical uplift, at well defined intervals, may hardly find its explication in isostatic readjustment Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Åbo akademi (1918- ). Åbo : Åbo akademi
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