The Aley Creek area is underlain by Cambrian to Devonian carbonate and clastic rocks of the Kechika Group, Skoki Formation and Road River Group. This miogeoclinal succession, deposited near the shelf/off-shelf boundary, was intruded by the Aley carbonatite complex prior to the main Late Jurassic-Early Cretaceous orogenic event. The complex consists of a rauhaugite (dolomitic carbonatite) core zone, 2 kilometres in diameter, surrounded by an older, outer ring of amphibolite. A contact aureole of recrystallized carbonate rocks surrounds the amphibolite margin. Rare-earth, carbonate-rich dykes occur throughout the complex but are most common in the outer alteration halo (contact aureole).
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Map Reference: 56°27'58"N , 123°44'51"W
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