Na-sanidine megacrysts from the Shavarin Caram volcano, Mongolia

Ulrych Jaromír and Pivec Edvín and Povondra P. and Buda György: Na-sanidine megacrysts from the Shavarin Caram volcano, Mongolia. In: Acta mineralogica-petrographica, (39). pp. 5-12. (1998)

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Na-sanidine crystals, their fragments and corroded relicts occur in scoria of leucite trachyte from the Shavarin Caram volcano, NW Mongolia. Opalescent perfect crystals of gem quality (up to 40 mm size) of moderate Or contents (46-49) reveal the following unit cell parameters: a = 0.8334(9)nm, b = 1.2997(6), c = 0.7159(6), (3 = 116.17°(5), V = 0.6949(15) nm3 . Na-sanidine together with garnet (Pyr-Alm), Al-clinopyroxene, Ti-phlogopite megacrysts represent a very strange, mostly high-pressure near-liquidus phenocryst association of high-potassic magma. Na-sanidine megacrysts, however, would crystallize probably from a Fe and fluid rich melt at lower pressure in near-solidus regions.

Item Type: Article
Journal or Publication Title: Acta mineralogica-petrographica
Date: 1998
Volume: 39
ISSN: 0365-8066
Page Range: pp. 5-12
Language: English
Publisher: University of Szeged, Department of Mineralogy, Geochemistry and Petrology
Place of Publication: Szeged
Related URLs:
Uncontrolled Keywords: Kőzettan, Ásványtan, Földtan
Additional Information: Bibliogr.: p. 11-12. ; összefoglalás angol nyelven
Subjects: 01. Natural sciences
01. Natural sciences > 01.05. Earth and related environmental sciences
Date Deposited: 2016. Oct. 17. 09:25
Last Modified: 2022. Jul. 27. 14:32

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