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felsic rock

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felsic rock

Igneous rock dominated by the light-coloured, silicon- and aluminum-rich minerals feldspar and quartz. The presence of these minerals gives felsic rock its characteristic light gray colour. The presence of small amounts of dark minerals rich in magnesium and iron produces slight colour variations. Typical felsic rocks include granite and rhyolite.



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Phase equilibria predict that intermediate and felsic rocks can originate by fractional crystallization of a more basic parent because the early fractionation of olivine, clinopyroxene and plagioclase drives the liquid toward more silicic compositions (Fig.
Francois Mountains has been reset to the same extent as in the older rocks of the Butler Hill Caldera and to thereby further constrain the extent and timing of the process(es) or event(s) responsible for resetting the K-feldspar structural state in the felsic rocks of the St.
In his letter of September 16, 2005, he notes: "The leases are underlain by the Kidd-Munro lithostratigraphic assemblage, a belt of ultramafic, mafic and felsic rocks, extending from the Kidd Creek area north of Timmins to the Ontario-Quebec border.
 
 
 
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