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Hi Trisrota, These rocks look quite similar to the calc-silicates occurring here in the Bergslagen Ore Province of central Sweden (known here as the reaction-skarns). Best, Jarek Quoting Trisrota Chaudhuri <[log in to unmask]>: > Dear all, > Im getting one epidote-quartz rock (epidosite?) associated with > rodingitized komatiite-clinopyroxenite ultramafic association in an Archean > greenstone belt of age between 3-3.5Ga. The rock is banded, having > alternate bands of Epidote (with little zoisite) and quartz (photo > attached). They are closely associated with ultramafics only. > It will be kind enough to share your opinion about the genesis of this > rock. If it is metasomatic rock, then what was the original one and how the > banding occurred is not clear to me. Is the banding primary? > Regards, > Trisrota > > -- > Trisrota Chaudhuri, > Geologist, > Geological Survey of India, > India. >