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@article{1386082,
author = {Novák, Aleš and Bábek, Ondřej and Kapusta, Jaroslav},
article_number = {355},
doi = {http://dx.doi.org/10.1016/j.sedgeo.2017.04.005},
keywords = {Late Pleistocene; Fluvial sediments; Provenance analysis; Heavy minerals; OSL dating; Tectonic},
language = {eng},
issn = {0037-0738},
journal = {Sedimentary Geology},
note = {Žádný z autorů nemá afiliaci na MU.},
title = {Late Quaternary tectonic switching of siliciclastic provenance in the strike-slip dominated foreland of the Western Carpathians; Upper Morava Basin, Bohemian Massif},
url = {http://dx.doi.org/10.1016/j.sedgeo.2017.04.005},
volume = {2017},
year = {2017}
}
TY - JOUR
ID - 1386082
AU - Novák, Aleš - Bábek, Ondřej - Kapusta, Jaroslav
PY - 2017
TI - Late Quaternary tectonic switching of siliciclastic provenance in the strike-slip dominated foreland of the Western Carpathians; Upper Morava Basin, Bohemian Massif
JF - Sedimentary Geology
VL - 2017
IS - 355
SP - 58-74
EP - 58-74
PB - Elsevier Science
SN - 00370738
N1 - Žádný z autorů nemá afiliaci na MU.
KW - Late Pleistocene
KW - Fluvial sediments
KW - Provenance analysis
KW - Heavy minerals
KW - OSL dating
KW - Tectonic
UR - http://dx.doi.org/10.1016/j.sedgeo.2017.04.005
L2 - http://dx.doi.org/10.1016/j.sedgeo.2017.04.005
N2 - This study is focused on the lithology and provenance of late Quaternary fluvial deposits of the Upper Morava Basin a pull-apart basin situated at the contact of the Bohemian Massif and Western Carpathians. Late Cenozoic tectonic convergence between these two units caused differential subsidence along strike-slip faults of the Elbe- Odra zone, leading to a distinct horst-and-graben morphology of the UpperMorava Basin. The Pleistocene fluvial deposits are preserved in several terrace levels and partly buried under the present-day floodplain of the Morava River. This study is based on four cores (11–25mdeep) drilled in the floodplain of two major depocentres of the basin, the Lutín Graben, and the Upper Morava Basin sensu stricto. The drill cores were analysed for grain size, pebble- and heavy-mineral composition, chemical composition of detrital garnets, bulk magnetic susceptibility, sediment colour (visible-light spectral reflectance) and bulk element geochemistry. Age interpretations are based on eight optically stimulated luminescence (OSL) analyses. The Upper Pleistocene sediments were deposited in a gravelly braided to transitional braided-meandering river in both the Upper Morava Basin s.s. and the Lutín Graben (the oldest OSL age is 161.5 ka, corresponding to the late Saalian). Between the end of the Saalian and late Weichselian glaciations, the Morava River abandoned the Lutín Graben for the Upper Morava Basin s.s. where it flows up to the present day. The Pleistocene fluvial style contrasts with the present-day meandering to anastomosing fluvial style of the Morava River. The Pleistocene deposits were sourced fromareas corresponding to the present-day Morava River catchment including crystalline units of the eastern Bohemian Massif and the Moravo-Silesian Carboniferous Basin. They also contain a considerable input from the Bohemian Cretaceous Basin. The composition of late Weichselian deposits from the Dub nad Moravou core (34.53 ± 3.42 ka and younger) differs from the older fluvial deposits representing the other cores. It indicates that a major provenance change occurred between the latest Saalian and the late Weichselian. In the late Weichselian, the Morava River started to recycle loess deposits,which cover large areas of its catchment. Based on OSL dating, itmay be assumed that the Morava River turned from degrading (between 92.6 ± 8.03 and 34.53 ± 3.42 ka) to aggrading in style (from 34.53 ± 3.42 ka to the present day) due to coeval tectonic movements in the UMB, which are indirectly indicated by present-day seismicity, geomorphic faults and palaeoseismic evidence. Both the tectonic context and fluvial deposition styles of the Upper Morava Basin show similar features to the Upper Rhine Graben of the Alpine foreland.
ER -
NOVÁK, Aleš, Ondřej BÁBEK a Jaroslav KAPUSTA. Late Quaternary tectonic switching of siliciclastic provenance in the strike-slip dominated foreland of the Western Carpathians; Upper Morava Basin, Bohemian Massif. \textit{Sedimentary Geology}. Elsevier Science, 2017, roč.~2017, č.~355, s.~58-74. ISSN~0037-0738. Dostupné z: https://dx.doi.org/10.1016/j.sedgeo.2017.04.005.
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