Kiglapait Geochemistry II: Petrography

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Abstract
The mode of the Kiglapait intrusion carries 73 per cent feldspar, but average rocks near the base of the Upper Zone contain as little as 48 per cent feldspar. Olivine remained stable throughout the crystallization, but was locally suppressed by abundant crystallization of augite and titano-magnetite. Red biotite occurs as rims on Fe−Ti oxide minerals and is probably fluorine oxybiotite; its frequently similar occurrence in troctolitic rocks may, perversely, indicate dry magmas rather than damp ones.

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