Rit (Vísindafélag Íslendinga) - 01.06.1967, Blaðsíða 44

40
Fig. 2. The distribution of central volcanoes in Iceland. These volcamc
centres are characterized by eruptions of acid and intermediate lavas and
tephra, the presence of minor intrusions, and often a high degree of ther-
mal alteration. Central volcanoes lábelled Recent on map have also been
active in Pleistocene, wi'th the possible exception of Hekla. The Setberg
central volcano on NW Snœfellsnes was active in Tertiary and Pleistocene.
A Arnarfjördur, Áf Álftafjördur, Ár Árnes, As Askja, B Baula, Br BreiS-
dalur, D Drápuhlídarfjall, E Esja, F Fossárdalur, Fl Flugustadadalur, Ft
Flateyjardalur, Ge Gerpir, Gr Geirvörtur, H Hafnarfjall, He Hengill, Hf
Höfn, Hk Hekla, Hú Húsafell, Hv Hvammur, K Kerlingarfjöll, Kr Króks-
fjördur, L Leirufjördur, Lj Ljósufjöll, Lm LóSmundarfjördur, Ló Lón,
M Molduxi, Mý Mývatn, Rf Reydarfjördur, S Snœfellsjökull, Se Setberg,
Sm Smjörhnúkar, Sn Snœfell, Sú Súlur, Ss SúSursveit, T Torfajökull, Th
Thingmúli, Ti Tindfjáílajökull, To Torfufell, Tu Tungnafellsjökull, V
Vídidálur, Vo Vopnafjördur, Ö Örœfajökull.
sented conclusive evidence as to the origin of the Icelandic
acid rocks, but Carmichael (1964), after a thorough petro-
logical study of the Thingmúli central volcano in eastem
Iceland, concludes that the acid and intermediate rocks of
the volcano may best be accounted for by differentiation.