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mafic rock

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mafic rock

In geology, any igneous rock dominated by the silicates pyroxene, amphibole, olivine, and mica. These minerals are high in magnesium and ferrous iron, and their presence gives mafic rock its characteristic dark colour. It is usually contrasted with felsic rock. Common mafic rocks include basalt and gabbro.



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Hydrothermal Alteration Alteration of the mafic rocks is generally expressed as biotite--chlorite--epidote--quartz-sulfide banding in the footwall proximal to the massive sulfide lenses at Hidden Creek (Fig.
39]Ar geochronology of mafic rocks from the granite-rhyolite terrane of southeastern Missouri, Precambrian Research, v.
 
 
 
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