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Journal of the Geological Society; November 1984; v. 141; no. 6; p. 1015-1032; DOI: 10.1144/gsjgs.141.6.1015
© 1984 Geological Society of London
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Article

Lower Palaeozoic convergent plate margin volcanism on Bømlo, SW Norway, and its bearing on the tectonic environments of the Norwegian Caledonides

Harald Brekke, Harald Furnes, Jan Nordås and Jan Hertogen

The island of Bømlo presents a geological section through a Caledonian convergent plate margin. The Lykling Ophiolite and the overlying ensimatic are sequence of the Geitung Unit were emplaced onto the Baltic Shield, probably in Arenig times. After a period of deep erosion, the Basin and Range type volcanics of the Siggjo Complex were deposited followed by a hiatus in the magmatism and a weak but widespread phase of vertical tectonism, possibly due to the successful subduction of a spreading ridge. At the top of the mainly sedimentary Ashgill/Llandovery Vikafjord Group, the Basin and Range type volcanism resumed. This was probably preceded immediately by the calc-alkaline, subaerial volcanism at the base of the Langevåg Group, which passes stratigraphically upwards into basin-fill lithologies such as submarine volcaniclastics, cherts, turbidites and submarine greenstones of chemistry compatible with the early stages of ensialic back-arc basin development. The stratigraphy and volcanism are discussed in context with recent views on the rest of the Norwegian Caledonides.




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