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felsic
(redirected from Felsic rock)

   Also found in: Encyclopedia, Wikipedia 0.01 sec.
fel·sic  (flsk)
adj.
Containing a group of light-colored silicate minerals that occur in igneous rocks.


felsic  (flsk)
Relating to an igneous rock that contains a group of light-colored silicate minerals, including feldspar, feldspathoid, quartz, and muscovite. Compare mafic.


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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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