Multiple sill in Iceland

Multiple sill in Iceland

Fig. 2. The local change in stress is commonly so as to favour subsequent dykes becoming deflected into a sill. Here, a close-up of the 120-m-thick multiple sills (a sill formed in many magma injections, each forming a columnar row) seen in Fig. 1. This sill clearly never developed into a magma chamber since its columnar rows cooled down too quickly for that to happen.

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