Dolerite Dikes in Koster Islands

Dolerite Dikes in Koster Islands


Apophyses (branches) of dark-coloured dolerite dikes in Kosterhavet National Park on Ramsö island in the Koster Islands in Sweden. The dykes intruded between the Gothian orogeny (1.64 to 1.52 Ga) and the Sveconorwegian orogeny (1,2 to 0.9 Ga) at about 1.44 Ga.

Photo: Thomas Eliasson of Geological Survey of Sweden

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