The Matheson ultrabasic belt is composed of numerous layered intrusions of dunite, peridotite, pyroxenite, and gabbro. The origin of these is attributed to local fusion of the peridotite substratum followed by multiple injection, so that differentiation in situ played only a relatively minor part. The belt is characterized by widespread serpentinization and steatitization - this having been effected in 2 stages, viz., autometasomatism and hydrothermal carbonatization. Chrysotile deposits - commonly of economic proportions - have originated both by replacement and fissure filling.

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