Studium těžkých minerálů v klastických sedimentech kambrického a devonského stáří na jihovýchodní Moravě – provenience a sedimentologie

Článek v PDF
Acta Mus. Moraviae, Sci. Geol. 93 (2008), vydání 1–2, stránky 169–184
Článek
Abstrakt:

Translucent heavy minerals from siliciclastic sediments of the Cambrian and Devonian age, SE Moravia, Czech Republic, Case study of provenance and sedimentology

Lower Cambrian and Middle Devonian siliciclastic sediments (arcoses, sandstones and conglomerates) form more than 2 km thick sedimentary cover of Brunovistulicum (Precambrian crustal blocks). Several facies identifying similar depositional environments were found both in the Cambrian and Lower and Middle Devonian siliciclastics. There were repeated transitions between the terrestrial and shallow marine conditions. The chemical composition of detrital garnets and tourmalines sampled both from the Cambrian and the Devonian sediments reflect similar provenance. Metasediments, mainly gneisses and schists as the main source rocks, were identified for the oldest parts of the Lower Cambrian sedimentary successions. Higher within the Lower Cambrian successions, a gradual decrease of granitoids in the source material was proved. There is a distinct hiatus between Cambrian and Devonian sediments. The composition of translucent heavy mineral assemblage in the Devonian sediments is strongly influenced by redeposition from older (Cambrian) sediments above the hiatus.

Kontakt:

David Buriánek, Czech Geological Survey, Leitnerova 23, Brno, e-mail: david.burianek@geology.cz
Helena Gilíková, Czech Geological Survey, Leitnerova 23, Brno, e-mail: helena.gilikova@geology.cz
Slavomír Nehyba, Institute of Geological Sciences, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic, e-mail: slavek@sci.muni.cz
Jiří Otava, Czech Geological Survey, Leitnerova 23, Brno, e-mail:: jiri.otava@geology.cz

Citace
Buriánek, D., Gilíková, H., Nehyba, S., Otava, J., 2008: Studium těžkých minerálů v klastických sedimentech kambrického a devonského stáří na jihovýchodní Moravě – provenience a sedimentologie. – Acta Mus. Morav., Sci. Geol., 93, 1–2, 169–184 (with English summary)
ISSN: 1211–8796