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diorite
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diorite

Igneous rock intermediate in composition between mafic (consisting primarily of dark-coloured minerals) and felsic (consisting primarily of light-coloured minerals) – the coarse-grained plutonic equivalent of andesite. Constituent minerals include feldspar and amphibole or pyroxene with only minor amounts of quartz.
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In many ancient arc systems, uplift and erosion have removed much of the volcanic arc, so that the crystallized products of the magma chambers are exposed as large plutonic bodies, typically of granitic to dioritic composition.
Igneous Rock Associations 7. Arc magmatism I: relationship between ... by Murphy, J. Brendan / Geoscience Canada
Underlain by a Cretaceous dioritic batholith, the property hosts spectacular intrusive hosted copper-gold mineralization in subhorizontal fractures and veins over an area of at least four square miles.
Alaska 2004: mining in review: exploration, development and ... by Freeman, Curtis J. / Alaska Business Monthly
The primary exploration target within the Orofino Project is bulk tonnage heap leachable gold and silver mineralization within quartz-carbonate veins, shears and structurally controlled breccias hosted in andesitic to dioritic volcanic rocks and associated with dacite dykes and sills.
Yale Acquires Central Claims at Orofino, Sonora, Mexico by Business Wire
 
 
 
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