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Best Answer: Intermediate rocks contain between 53% and 65% silica. They also contain potassium and plagioclase feldspar with a small amount of quartz.est Answer: Intermediate rocks contain between 53% and 65% silica. They also contain potassium and plagioclase feldspar with a small amount of quartz.
Schlieren, lenses and boudinaged bands of amphibolite, metasedimentary, granitoid and rare ultramafic rocks are present. Discordant mafic sheets that truncate early compositional layering in the rocks, but that are folded and locally boudinaged, may represent dykes that predate younger supracrustal rocks. Late Archean supracrustal rocks, consisting of ultramafic, mafic, intermediate and felsic volcanic rocks, siliciclastic rocks and ironstones, comprise the greenstone belts that host much of the gold and base metal endowment of Nunavut.