Abstract:The Coire Dhuinnid fault zone contains emerald green chromian illite-ankerite-quartz rocks that are similar in appearance to the fuchsite(or mariposite)-carbonate-quartz parageneses that are commonplace in Archaean greenstone belts but which are rather rare in Phanerozoic rocks. The chromian illite contains 2.3 wt.% Cr20> low K20 (7.1 7.6 wt.%) and high H20+ (5.7 wt.%), and it is a 1M polytype with ~<10% of an illite/smectite interstratification indicative of a formation temperature of c. 175-200~ The host roc… Show more
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