Acadian metamorphism in central massachusetts and south-western New Hampshire

evidence for contrasting P-T trajectories

J. C. Schumacher*, Renate Schumacher, Peter Robinson

*Corresponding author for this work

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11 Citations (Scopus)

Abstract

Early work by numerous investigators (Robinson 1963, Tracy et al. 1976, Robinson et al. 1982, 1986a, b) provides a structural and metamorphic framework for the Acadian metamorphic high in central Massachusetts within which changes in phase composition and assemblage in the rocks can be correlated. Six metamorphic zones have been distinguished (Tracy et al. 1976, Robinson et al. 1982), reflecting prograde (T) metamorphic conditions in graphite-bearing pelitic rocks (Fig. 1) that range from the amphibolite through to the lower granulite facies. The T and P estimates are based mainly on A. B. Thompson’s (1976) pioneering work in quantifying T and P using biotite-garnet Fe/Mg exchange and the garnet-cordierite-sillimanite-quartz assemblage, respectively.
Original languageEnglish
Pages (from-to)453-460
Number of pages8
JournalGeological Society Special Publication
Volume43
DOIs
Publication statusPublished - 1989
Externally publishedYes

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