Abstract

A reaction sequence involving different mineral phases may be used as a relative time scale against which a deformational sequence can be plotted and tested as paracrystalline. In the example reported, deformation involves micro-boudinage due to elongation parallel to the schistosity, and the reaction sequence is from relict primary clinopyroxene to tremolite to Mg-chlorite in a regionally metamorphosed ultramafic rock from the Northern Cascades of Washington.

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