Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Describing igneous rocks that have a higher ratio of sodium and potassium to aluminium than is needed to produce feldspar

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

per- +‎ alkaline

Examples

  • Fig. 9 (A, B) shows an MI believed to have formed as a two-phase mixed inclusion (melt + fluid) within a quartz phenocryst of peralkaline rhyolite (Lowenstern et al. 1991).

    Evidence for Fluid Saturation and Degassing

  • More recently, several authors have described salt clusters in MI within quartz and feldspar from the peralkaline rhyolites from Pantelleria,

    Evidence for Fluid Saturation and Degassing

  • Roedder (1972) found the former in granitic nodules ejected during eruptions of peralkaline trachytes from Ascension Island.

    Evidence for Fluid Saturation and Degassing

  • The Windy Fork Placer occurrence is located at the confluence of the Windy Fork of the Kuskokwim River and two unnamed, north flowing tributaries draining the Windy Fork peralkaline plutonic complex.

    Marketwire - Breaking News Releases

  • In the map representation, Bokan Mountain is located to the west, with high grade uranium hosted within, or at the margins of, a peralkaline ring-dyke intrusive complex.

    Marketwire - Breaking News Releases

  • The Rusty Ridge is located within a continental extensional environment within peralkaline rocks emplaced adjacent to a regional fault system.

    News

  • The KAC has been divided into two main units in the mineralized zone: a peralkaline granite gneiss unit and a syenite gneiss unit (with calc-silicate rocks intercalated within the syenite gneiss).

    The Earth Times Online Newspaper

  • 1991, Investigation of rare-earth elements and zirconium in the Windy Fork peralkaline pluton, west-central Alaska: U.S. Bureau of Mines field report, 36 p. (2) Reed,

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  • a concordant folded sheet of mildly peralkaline syenite and granite less than 200 metres thick.

    The Earth Times Online Newspaper

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