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Abstract
Selected geochemical data (principally immobile elements, including rare earth elements), are presented for a restricted basic instrusive suite to the west of the Conway Valley, North Wales. Immobile element data are used to characterise the rocks in terms of magma type, differentiation and tectonic environment by comparison with modern fresh volcanics. The intrusives have suffered varying degrees of low-grade hydrous metamorphism and are now meta-dolerites exhibiting an admixture of primary and secondary phases. The meta-dolerites compare closely to sub-alkaline, high alumina basalts and in general are little differentiated. They were probably generated near the margin of a stable continental plate; that is. continental calc-alkali volcanism, ‘Andean-type’. A calc-alkali island arc environment seems less likely. One unexpected geochemical feature is the discovery of lateral chemical variation and symmetry along the strike of the intrusive outcrop with the development of ‘primitive’, low immobile element, basaltic rocks (akin to ocean floor basalts) in the central zone.
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