Příspěvek k poznání provenience valounů ve slepencích svrchnoviséského stáří na Drahanské vrchovině: VI. - skarnoid

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Title in English	Contribution to the knowledge of provenance of pebbles from the Upper Viséean conglomerates in the Drahany Hights: VI. - skarnoid
Authors	FOJT Bohuslav HOUZAR Stanislav NOVÁK Milan
Year of publication	2009
Type	Article in Periodical
Magazine / Source	Acta Musei Moraviae Scientiae Geologicae
MU Faculty or unit	Faculty of Science
Citation
Field	Geology and mineralogy
Keywords	skarnoid grunerite magnetite almandine Luleč Conglomerate Drahany Culm provenance
Description	The pebble of leucocratic biotite migmatite (plagioclase >> K-feldspar) with a small nodule of skarnoid rock (garnet+amphibole+magnetite+quartz) was found at locality Račice, Luleč conglomerates, Drahany Hights. Minerals from both rocks were studied in detail using electron microprobe and polarizing microscope. Thin transitional zone with An-enriched plagioclase (Ab56-57 An43 Or0-1) is developed between skarnoid and migmatite. The mineral assemblages and chemical composition of minerals in skarnoid (almandine Alm73-74Grs14-16Prp6Sps2-3Adr2-3, grunerite XFe = 0.63-0.64, ferri-ferrohornblende XFe = 0.74-75 and in host migmatite (plagioclase Ab68-72 An25-29 Or1-4), are similar with those from the localities of magnetite-rich amphibolites from the Polička Unit or border facie of magnetite skarn in the Pernštejn area, Svratka Unit, respectively.
Related projects:	Interactions among the chemicals, environment and biological systems and their consequences on the global, regional and local scales (INCHEMBIOL)