Publication details

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

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.
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