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Origin of Potassium-rich Silica-deficient Igneous RocksTernary Systems with Feldspathoids

Origin of Potassium-rich Silica-deficient Igneous Rocks: Ternary Systems with Feldspathoids [In the fractionation scheme of basaltic magmas, CaO, MgO and total iron oxide (FeO + Fe2O3) contents decrease progressively, and those of Al2O3, Na2O andK2O versus SiO2 contentsK2O increase with respect to silica (Harker 1909), as a result of which the residual liquid becomes enriched with respect to NaAlSiO4 (nephelineNepheline), KAlSiO4 (kalsiliteKalsilite), and SiO2 components.Alkali versus SiO2 contents Bowen (1928), therefore, referred to the system NaAlSiO4–KAISIO4–SiO2 as petrogny’s residua system, in which the NaAISi3O8 (albite)–KAlSi3O8 (K-feldsparK-feldspar) join acts as a thermal barrier at low pressures.] http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png

Origin of Potassium-rich Silica-deficient Igneous RocksTernary Systems with Feldspathoids

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Publisher
Springer India
Copyright
© Springer India 2015
ISBN
978-81-322-2082-4
Pages
259 –276
DOI
10.1007/978-81-322-2083-1_7
Publisher site
See Chapter on Publisher Site

Abstract

[In the fractionation scheme of basaltic magmas, CaO, MgO and total iron oxide (FeO + Fe2O3) contents decrease progressively, and those of Al2O3, Na2O andK2O versus SiO2 contentsK2O increase with respect to silica (Harker 1909), as a result of which the residual liquid becomes enriched with respect to NaAlSiO4 (nephelineNepheline), KAlSiO4 (kalsiliteKalsilite), and SiO2 components.Alkali versus SiO2 contents Bowen (1928), therefore, referred to the system NaAlSiO4–KAISIO4–SiO2 as petrogny’s residua system, in which the NaAISi3O8 (albite)–KAlSi3O8 (K-feldsparK-feldspar) join acts as a thermal barrier at low pressures.]

Published: Jul 31, 2014

Keywords: Pseudoleucite; Analcite; Kalsilite; Nepheline; Jadeite

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