Barroisite-bearing Ecologite from Naustdal, Song og Fjordane, Norway

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Abstract
Chemical and mineralogical data are presented for the constituents of an eclogite from Naustdal, Norway. Textural relationships indicate that the primary amphibole, a barroisitic variety intermediate in composition between glaucophane and common hornblende, formed in equilibrium with the omphacite, garnet, rutile, and apatite, but petrofabric evidence suggests that it crystallized somewhat later. The petrogenesis of this rock is discussed in terms of two alternative hypotheses, namely of partly magmatic or of strictly metamorphic origin, but no definite conclusion can be reached from the evidence available. The types of amphibole found in eclogites and their nomenclature are reviewed.

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