Abstract
Major and trace element chemistry suggest that the Holyrood plutonic series is a co-magnetic calc-alkaline suite, formed at about 5 kb P H 2O by fractionation of plagioclase, amphibole and clinopyroxene from a gabbroic magma which was derived from the upper mantle. It appears unlikely that the series is genetically related to the Harbour Main volcanic rocks, either magmatically or by hybridization. Chemical comparison of the Holyrood series with suites from known tectonic environments suggest that this region approximated a ‘basin and range’ type of tectonic setting during formation of the Holyrood plutonic series.
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