Rock-forming minerals of alkaline volcanic series associated with the Cheb-Domažlice Graben, West Bohemia

0145765 - GLU-S 20033137 RIV HU eng J - Journal Article
Ulrych, Jaromír - Novák, Jiří Karel - Lloyd, F. E. - Balogh, K. - Buda, G.
Rock-forming minerals of alkaline volcanic series associated with the Cheb-Domažlice Graben, West Bohemia.
Acta Universitatis Szegediensis. Acta Mineralogica - Petrographica. Roč. 43, - (2002), s. 1-18. ISSN 0365-8066
R&D Projects: GA ČR GA205/99/0907
Grant - others:Hungarian Academy of Sciences Foundation(HU) T 014961
Institutional research plan: CEZ:AV0Z3013912
Keywords : volcanics * Bohemian Massif * rock-forming minerals
Subject RIV: DB - Geology ; Mineralogy
http://www.asvanytan.hu/data/asv/content/62-1-AMP_ulrychVol43.pdf

Two coexisting cogenetic volcanic series have been recognised in W Bohemia: weakly and strongly alkaline series. Early crystallization in the mafic rocks is manifested by olivine phenocrysts (Fo66-76), melilite, Ti-magnetite and (Ti, Fe+)-diopside to fassaite; in the intermediate rocks by diopside; and in the felsic rocks by (Mn, Ti)-magnetite, diopside, and high-temperature K-oligoclase (phenocryst cores). Continuing to late crystallisation in mafic to intermediate rocks in represented by kaersutite, nepheline (at T<700oC; also occurs with melilite in ijolite ongoing crystallisation is characterised by Mn-magnesioriebeckite, Mn-winchite and Mg-biotite; feldspars are prevalently anorthoclase (perthite), which occasionally mantles K-oligoclase and is succeeded by Na-sandine. Feldspars and quartz in the matrix of the felsic rocks terminate crystallization.
Permanent Link: http://hdl.handle.net/11104/0043314