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单词 felsic
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felsic

Dominant detrital quartz and feldspar grains of the sandstones suggest predominantly felsic sources.Magma mixing structures indicate co-existence of mafic and felsic end-members.Magmatic zircons from a felsic high-grade rock provide ages of ca.Felsic plutonic detritus was derived from either subvolcanic plutons or from an unlocated basement complex.Injections of mafic magma invaded the felsic chamber and those magmas interacted mainly by intermingling.This variation in strain correlates with variation in rock composition; felsic metavolcanics demonstrate consistently lower strain intensities than mafic ones.Based on their major and trace element compositions, the tuffaceous- and sandy-slates were sourced from a felsicigneous provenance.Infiltration modes of felsic melts are likely controlled by the temperature condition of the cooling host gabbros.We speculate that the upper crust was composed of fractionated gabbros and the middle felsic crust by anorthosite at ca.It suggests that most of the crust along the profile lacks mafic component, but contains more felsic substance.
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