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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Abstract
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: | http://acta.bibl.u-szeged.hu/39418/ |
| 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 |
| URI: | http://acta.bibl.u-szeged.hu/id/eprint/24865 |
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