In the eyes of this reviewer, and probably of most practicing geologists, low-grade metamorphism is greenschist and lower amphibolite (“epidote-amphibolite” of yore) facies of regional metamorphism, and the albite–epidote facies of contact metamorphism. Such metamorphism produces thoroughly recrystallized rocks, mostly between 400 and 600°C, in which few of the protolith phases have survived intact. The subjects of the book here under review, Low-Grade Metamorphism, are, in fact, very low-grade rocks, those head-scratchers that commonly exhibit only feeble direct evidence of recrystallization: rocks of sub-greenschist and sub-blueschist (<400°C) facies (p. 1). Most of the rocks and assemblages discussed in Low-Grade...

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