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Compared to stratigraphically equivalent Lower Ordovician slates and graywackes some 300 to 1,000 m from mineralization, the turbidite host rocks over an interval (80 m true width) that includes auriferous quartz veins at Clunes display more intense cleavage, are bleached in appearance, and possess conspicuous porphyroblasts and veinlets of ankerite and siderite. Apart from enrichments in CO2 and As, however, there is little geochemical contrast between remote and proximal wall rocks. Minor mobility of lithophile elements during cleavage development prior to mineralization and wall-rock alteration masks a slight potassium enrichment within tens of centimeters from lode veins. This...

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