Jökull

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Jökull - 01.12.1984, Qupperneq 88

Jökull - 01.12.1984, Qupperneq 88
columns. The number of columnar rows in indi- vidual dykes is from one to over twenty. As a rule, only the thinnest dykes (a few tens of centi- meters in thickness) have only a couple of rows. The thicker dykes in general have three or more columnar rows. Most of the inner columnar rows of the dykes are without chilled edges. In some of the lateral and vertical sections, dykes are disconnected. In some other sections, the parts of the dyke are connected by thin veins (Fig. 11), in particular where the dykes dissect scoria between the lava flows. Where the dykes are laterally or vertically offset, some of them gradate into palagonite tuff and breccia. Eleven dykes were seen to end upwards. The dykes end in different ways (Fig. 12), but most of them simply taper away. Where the very ends of the dykes could be observed, it could be demons- trated that, except in one instance, no fractures associated with the mechanical effects of the intrusion occur ahead of the dykes. In one inst- ance, however, the dyke has apparently given rise to a few normal faults at its upper end (Fig. 13). -r < M f ' 1 i ' " ...................... ■ ■ ■ ’ i 0 5 10 15 20 25 Thickness, m 15 74 13 12 11 10 9 8 7 6 5 4 3 2 Fig. 9. Thickness distribution of dykes in the profiles 1 to 15. See location of the pro- ^ files in Fig. 2. Mynd 9. Þykktardreifing ganga í þeim 15 sniðum sem sýnd eru á mynd 2. 86 JÖKULL 34. ÁR
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