Zones of Progressive Regional Metamorphism in the Moine Schists of the Western Highlands of Scotland

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Abstract
The Moine Schists of Western Inverness-shire and North-West Argyll show a progressive increase in metamorphism when traced from the outcrop of the Moine Thrust-plane eastwards towards the central area of regional injection and migrnatitization. It is possible to distinguish four zones of progressive metamorphism characterized by the development of distinctive mineral assemblages in the very subordinate, but widely distributed and highly distinctive calc-silicate granulites. The easterly increase in grade is attributed to the thermal effect of the great injection complexes, and it is suggested that the Torridonian, the Tarskavaig Moine Schists, and the Moine Schists proper merely represent successive stages in the regional metamorphism of one formation.