felsic


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fel·sic

 (fĕl′sĭk)
adj.
Relating to or containing a group of light-colored silicate minerals that occur in igneous rocks, including minerals of the feldspathoid group and the minerals quartz, feldspar, and muscovite.

felsic

(ˈfɛlsɪk)
adj
(of minerals) predominantly composed of feldspars or silicates
References in periodicals archive ?
The underlying geology is comprised of friable carbonaceous argillite overlain by Tertiary felsic tuff and quaternary ash.
Similar felsic intrusions are associated with the gold mineralization at the nearby Cortez mine.
90 square kilometres): This permit area occurs within a highly faulted and fractured igneous terrain composed of intermediate volcanic units intruded by felsic dykes and quartz vein systems.
Recent compilation and interpretation of geological data from past exploration indicate that the area is underlain by a southeast trending, steep southwest dipping package of ultramafic to felsic volcanic rocks located along the southeasterly extension of the Tyrell Shear zone (TSZ).
Additional work is being planned to define prospective targets on the 15+ kilometers of prospective folded host felsic volcanic stratigraphy between the two known deposits.
The Alto-Gardnar gold occurrence consists of a complex quartz-ankerite vein system enclosed within a 10-metre wide, NE-SW trending, shear zone in mafic volcanics and small irregular felsic intrusions of the Southern Volcanic Belt.
The region is underlain by sedimentary and mafic to felsic volcanic rocks with coeval intrusives, all of Archean age.
Claims within Kidd Township are located approximately 4 km southwest of Kidd Creek and are believed to be underlain by felsic and mafic volcanic rocks of the appropriate age.
Microcrystalline felsic intrusions are also reported within the volcanic pile.
b) Disseminated type mineralization occurs in the Launay felsic intrusive rocks where gold-bearing pyrite is disseminated in a massive intrusive phase rich in plagioclase feldspar ("albitite"); this type of mineralization is found in Zone "75".
Initially acquired to cover a high-grade sphalerite (zinc) showing in felsic volcanic rocks, the PII project was expanded following the subsequent discovery of numerous extensive gossans and the delineation of four, partially overlapping, geochemical anomalies (Au, Ag, Cu, Pb, Zn) as previously reported on Dec.
Host rocks are basaltic volcanic flows and mafic to felsic intrusive rocks.