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Origin of Potassium-rich Silica-deficient Igneous RocksLeucite- and Feldspar-Bearing Systems

Origin of Potassium-rich Silica-deficient Igneous Rocks: Leucite- and Feldspar-Bearing Systems [NephelinitesNephelinite have been considered to be the most perplexing group of igneous rocks by Bailey (1974). Such rocks predominantly contain nephelineNepheline and augite with other accessory minerals. They are usually associated with rocks of melteigite–ijolite–urtite series in close proximity to either leucite-bearingMafic phonolite mafic lavas, or carbonatites. Sometimes, they are also observed as a highly fractionated group of rocks derived from lavas of alkali basaltAlkali basalt–phonoliteLeucite phonolite series; in such cases, sanidine becomes an important phase in addition to augite and nepheline.] http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png

Origin of Potassium-rich Silica-deficient Igneous RocksLeucite- and Feldspar-Bearing Systems

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Publisher
Springer India
Copyright
© Springer India 2015
ISBN
978-81-322-2082-4
Pages
289 –309
DOI
10.1007/978-81-322-2083-1_9
Publisher site
See Chapter on Publisher Site

Abstract

[NephelinitesNephelinite have been considered to be the most perplexing group of igneous rocks by Bailey (1974). Such rocks predominantly contain nephelineNepheline and augite with other accessory minerals. They are usually associated with rocks of melteigite–ijolite–urtite series in close proximity to either leucite-bearingMafic phonolite mafic lavas, or carbonatites. Sometimes, they are also observed as a highly fractionated group of rocks derived from lavas of alkali basaltAlkali basalt–phonoliteLeucite phonolite series; in such cases, sanidine becomes an important phase in addition to augite and nepheline.]

Published: Jul 31, 2014

Keywords: Leucite Hills; Four-phase Point; Mela Nephelinite; Melanephelinite; Leucite Tephrite

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