Browsing NGU Open Archive by Author "Carstens, Harald"

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A post-Caledonian ultrabasic biotite lamprophyre dyke of the island Ytterøy in Trondheimsfjord, Norway.

Carstens, Harald (NGU (215), Journal article, 1962)

A lamprophyre having pronounced alnøitic - kimberlitic affinities is described. It is suggested that the intrusion of the dyke is connected with Permian rift faulting.
On the variolitic structure.

Carstens, Harald (NGU (223), Journal article, 1963)

The article presents detailed descriptions of the variolitic structure in selected minor intrusions and lavas. The evidence indicates that the varioles formed by liquid segregation rather than by spherulitic crystallization.