felsic

Etymology

Definitions

1. 1

   Enriched in minerals predominantly composed of the lighter elements such as silicon,…

   Enriched in minerals predominantly composed of the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium.

   • Much of the southern half of the southeastern body is a mafic syenite, slightly more felsic than the shonkinite.
   • Within comagmatic suites, successively younger granitoids are commonly, but not invariably, more felsic, representing progressively lower temperature mineral assemblages.
   • The Claret Creek Supersuite granites are a little more felsic (65-77% SiO₂), and are chemically distinctive, having higher Al₂O₃, CaO, Na₂O and Sr, and lower K₂O, Rb, Th and U than the granites of the Almaden Supersuite.
2. 2

   A rock with such properties.

   • The central part of this nepheline syenite is very white felsics with black mafics in it. The entire area contains many nepheline-bearing dike rocks, but almost all are gray or pink or even red due to the color in the felsics.
   • There are also calcalkaline felsics that have highly enriched LREE^([light rare-earth element]) patterns with lower overall abundances.

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