Инд. авторы:	Grapes R., Korzhova S., Sokol E., Seryotkin Y.
Заглавие:	Paragenesis of unusual Fe-cordierite (sekaninaite)-bearing paralava and clinker from the Kuznetsk coal basin, Siberia, Russia
Библ. ссылка:	Grapes R., Korzhova S., Sokol E., Seryotkin Y. Paragenesis of unusual Fe-cordierite (sekaninaite)-bearing paralava and clinker from the Kuznetsk coal basin, Siberia, Russia // Contributions to Mineralogy and Petrology. - 2011. - Vol.162. - Iss. 2. - P.253-273. - ISSN 0010-7999. - EISSN 1432-0967.
Внешние системы:	DOI: 10.1007/s00410-010-0593-0; SCOPUS: 2-s2.0-79960105129;
Реферат:	eng: Sekaninaite (XFe > 0.5)-bearing paralava and clinker are the products of ancient combustion metamorphism in the western part of the Kuznetsk coal basin, Siberia. The combustion metamorphic rocks typically occur as clinker beds and breccias consisting of vitrified sandstone-siltstone clinker fragments cemented by paralava, resulting from hanging-wall collapse above burning coal seams and quenching. Sekaninaite-Fe-cordierite (XFe 95-45) is associated with tridymite, fayalite, magnetite,±clinoferrosilite and±mullite in paralava and with tridymite and mullite in clinker. Unmelted grains of detrital quartz occur in both rocks (<3 vol% in paralavas and up to 30 vol% in some clinkers). Compositionally variable siliceous, K-rich peraluminous glass is<30% in paralavas and up to 85% in clinkers. The paralavas resulted from extensive fusion of sandstone-siltstone (clinker), and sideritic/Fe-hydroxide material contained within them, with the proportion of clastic sediments>ferruginous component. Calculated dry liquidus temperatures of the paralavas are 1,120-1,050°C and 920-1,050°C for clinkers, with calculated viscosities at liquidus temperatures of 101.6-7.0 and 107.0-9.8 Pas, respectively. Dry liquidus temperatures of glass compositions range between 920 and 1,120°C (paralava) and 920-960°C (clinker), and viscosities at these temperatures are 109.7-5.5 and 108.8-9.7Pas, respectively. Compared with worldwide occurrences of cordierite-sekaninaite in pyrometamorphic rocks, sekaninaite occurs in rocks with XFe (mol% FeO/(FeO+MgO))>0.8; sekaninaite and Fe-cordierite occur in rocks with XFe 0.6-0.8, and cordierite (XFe<0.5) is restricted to rocks with XFe <0.6. The crystal-chemical formula o-f an anhydrous sekaninaite based on the refined structure © 2010 Springer-Verlag.
Ключевые слова:	Kuznetsk Basin; viscosity; paragenesis; mineralogy; metamorphism; geochemistry; cordierite; Russian Federation; breccia; Viscosities; Temperatures; Sekaninaite, paralava, clinker; Mineralogy; Kuznetsk coal basin, Siberia; Geochemistry; coal seam;
Издано:	2011
Физ. характеристика:	с.253-273