Cryptic layering in the Belhelvie intrusion, Aberdeenshire

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Abstract
Synopsis: A re-investigation of the northern part of the Belhelvie intrusion indicates that the layered sequence can be divided into three main units (A, B, and C), based on the successive cumulus mineral assemblages olivine, olivine-plagioclase, and olivine-plagioclase-2 pyroxenes. In this part of the intrusion the thickness of the layered series is at least 6000 ft, and cryptic variation is from Fo 86→80 , An 81→74 , En 85→78½ , and Ca 42 Mg 51 Fe 7 to Ca 41 Mg 48 Fe 11. Over much of the outcrop the rhythmic layering is nearly vertical, but in the eastern part there is evidence that the succession is almost horizontal. The Belhelvie intrusion is considered in its regional setting, and compared with the other ‘younger gabbros’ of north-east Scotland.

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