The Significance of Tourmaline in the Stratiform Dome Rock Deposit, Australia
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概要
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The Dome Rock deposit, South Australia is a submarine exhalative copper-cobalt deposit of Early Pro-terozoic age in multiply defomed and metamorphosed metasediments and metavolcanics. Although there is no distinct alteration zone, tourmaline and ferromagnesian silicates are present in the footwall, ore zone and hanging wall. On the basis of optical and chemical studies, tourmaline and ferromagnesian silicates vary from Mg>Fe species in the footwall pelitic metasediments and ore zone to Fe>Mg species in the hanging wall pelitic metasediments, iron formation and albite rocks. This variation is similar to the variation in the Mg and Fe content of chlorites associated with Kuroko deposits.<BR>Tourmaline in the metasediments formed by metamorphism of boron-rich clays derived from hydrothermal fluid-sediment interaction, whereas tourmaline in the sulfide rocks and overlying albite rocks derived from the primary precipitation of boron-rich species such as a boron-rich clay, reedmergnerite or tourmaline from the ore fluid.
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