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 |
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| Authors | |
| Year of publication | 2009 |
| Type | Article in Periodical |
| Magazine / Source | Acta Musei Moraviae Scientiae Geologicae |
| MU Faculty or unit | |
| 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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