Igneous layering in the Ulvö dolerite, Ångermanland, Central Sweden

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Abstract
The post-Jotnian Ulvö Dolerite intrudes into the coastal area of Ångermanland, Sweden It is at least 200 m thick and dips gently south-east, penetrating sub-Jotnian intrusive rocks and Jotnian sediments in the south, and Svecokarelian gneisses and granites in the north. The dolerite has alkali basalt affinities and is layered, the latter being interpreted as the result of gravitational settling. Primary structures are frequent, and several varieties of igneous layering have been identified. Dolerite pegmatite and monzonitic dolerite are also common. The intrusion has been sampled for whole-rock and mineral analysis.

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