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GEOREF RECORD

Fayalite and kirschsteinite solid solutions in melts from burned spoil-heaps, South Urals, Russia

Ella Sokol, Victor Sharygin, Vallery Kalugin, Nina Volkova and Elena Nigmatulina
Fayalite and kirschsteinite solid solutions in melts from burned spoil-heaps, South Urals, Russia
European Journal of Mineralogy (August 2002) 14 (4): 795-807

Abstract

Individual grains of calcian fayalite and ferroan kirschsteinite, as well as fayalite-kirschsteinite intergrowths are observed in the groundmass of basic crystallised melts, or parabasalts, form burned spoil-heaps of the Chelyabinsk brown-coal basin. Exsolved fayalite and kirschsteinite rims surround the grains of fayalite and early Mg-Fe olivine. The chemical study of the olivines has shown that during their crystallisation they were becoming enriched in fayalite and larnite and depleted in forsterite. The intergrowths of ferroan kirschsteinite (>wt.% of CaO) and calcian fayalite (<8.5 wt.% of CaO) are the exsolution products of an initially homogeneous Ca-Fe olivine with CaO > 835 wt.%. The exsolution temperatures were estimated to 980-800 degrees C. The main reasons for the appearance of the Ca-Fe olivine in the parabasalts are the composition of the initial melt enriched in FeO and CaO, fractional crystallisation resulting in further enrichment in iron of the residual low-silica melt, and reducing conditions during olivine crystallisation and exsolution.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 14
Serial Issue: 4
Title: Fayalite and kirschsteinite solid solutions in melts from burned spoil-heaps, South Urals, Russia
Affiliation: Russian Academy of Science, Institute of Mineralogy and Petrography, Novosibirsk, Russian Federation
Pages: 795-807
Published: 200208
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 44
Accession Number: 2002-064891
Categories: Mineralogy of silicatesIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 7 tables
N51°00'00" - N56°00'00", E55°00'00" - E61°00'00"
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200220
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