Abstract
Abstract Samples from a wollastonite‐rich lens, up to 55 m long and 10 m wide, within the contact aureole of the Canaan Granodiorite at Holyoake Valley, include a variety of calc‐silicate rocks which locally contain abundant titanite. The mineralogy of the contact rocks indicates hornblende ‐hornfels facies conditions during metamorphism. Within the wollastonite body, an intrusive vein of monzonitic composition, up to 2 m across, probably resulted from crystallisation of granodioritic magma modified by partial desilication and contamination from adjacent calcium‐rich rocks. Zoned calc‐silicate rocks, apparently formed by reaction between wollastonite and basic hornfels that had been produced by recrystallisation of a dike of probable basaltic composition, are also present. Late intrusion of small amounts of quartzofeldspathic magma took place along discontinuities, including the dike boundaries, within and adjacent to the wollastonite body. Iron and titanium metasomatism was probably associated with intru...
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