Abstract
A pre-Middle Ordovician sequence of plutonic, volcanic, and sedimentary rocks of the southwest Norwegian Caledonides represents a stratified ophiolite. This sequence, called the Karmoy ophiolite, has a minimum thickness of 6 km. Its basal plutonic zone consists of several units of cumulate gabbro that were affected by polyphasal deformation before the intrusion of a sheeted-dike complex, which fed a thick overlying sequence of pillow basalts. These are overlain conformably by cherts, phyllites, volcaniclastic layers, and pillow lavas. The ophiolite was subsequently intruded by a series of granitic bodies that are considered to have been generated by partial melting in the downgoing slab of Baltic Shield crystalline rocks during or after obduction of the Karmoy ophiolite.
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