Abstract

Serpentinites of the late Precambrian “Monian” rocks in Anglesey bear petrographic textures which can be arranged in an evolutionary series, the stages of which may correspond to regional events.

The “mesh” texture (lizardite), produced prior to deformation by alteration of a parental peridotite, was modified during the regional D1 flexural-slip movements to a “ribbon” texture, also lizardite. The ensuing formation of “bladed mat” texture (antigorite) may have resulted from the in-homogeneous response of the serpentinites to the regional greenschist facies metamorphism. “Disturbed” varieties of all of the foregoing textures are probably the result of the regional D2 movements.

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