D 2003

Původ spessartinem bohatých granátů v drobách Drahanské vrchoviny

ČOPJAKOVÁ, Renata; Milan NOVÁK a Jiří OTAVA

Základní údaje

Originální název

Původ spessartinem bohatých granátů v drobách Drahanské vrchoviny

Název anglicky

The origin of spessartine-rich garnets in graywackes of the Drahany Upland

Autoři

Vydání

Olomouc, Moravskoslezské Paleozoikum 2003, od s. 6-7, 2003

Další údaje

Typ výsledku

Stať ve sborníku

Utajení

není předmětem státního či obchodního tajemství

Označené pro přenos do RIV

Ne

Organizační jednotka

Přírodovědecká fakulta

Klíčová slova anglicky

spessartine rich garnets; provenance; Drahany Culm; Czechoslovakia

Štítky

Změněno: 11. 11. 2003 19:16, Mgr. Renata Čopjaková, Ph.D.

Anotace

Anglicky

Studies of garnet geochemistry by electron microprobe is widely applicable in solving problems of provenance. Spessartine-rich garnet is rather less common then other main garnet species which makes it a provenance sensitive indicator. This paper presents example that show the value of spessartine-rich garnets in provenance study of Lower Carboniferous sediments of Drahany Upland. Polymict garnet assemblages of Drahany Upland (Protivanov-, Rostání- and lower part of Myslejovice Formation, Goniatite zones Peg a Goa) with various mixture of garnet geochemistry contain more than 20% of spessartine-enriched garnets. The change into pyrope-almandines predominant oligomict assemblages (upper part of Myslejovice Formation, Goniatite zones Gob a Gog) is characteristic among others by a sudden decrement of spessartine-rich garnets below 5% and reflects changes in provenance. It is commonly believed that the clastic material originates from crystalline terrains situated West of Culm sedimentary basin. The study of spessartine-enriched garnet geochemistry in polymict garnet assemblages provides cogent evidence of supply clastic material from northern situated geological units (Silesicum and Orlice-kladsko Crystalline Unit). The youngest sediments (polymict garnet assemblages) were not ever supplied by the Silesicum and Orlice-kladsko Crystalline Unit but material came from West. Certain part of spessartine-enriched garnets can arise from recycled older Culm sediments.