Abstract

Fracture phenomena in and around partly serpentinized patches of dunite in ultrabasic rocks from the Greenhills Complex are relevant to the constant volume versus constant composition serpentinization controversy. Commonly, fracture systems radiate from rounded blocks of dunite, and fracturing in irregularly shaped dunite patches suggests that flowage occurred. However, the general lack of post-serpentinization deformation of the dunite does not substantiate more than token volume expansion. Cleavage developed in enigmatic intersecting dunite dikes is not apparently related to serpentinization.

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