2011
Fluvial deposits of the St. Marein Freischling Formation insights into initial depositional processes on the distal external margin of the Alpine Carpathian Foredeep in Lower Austria
NEHYBA, Slavomír a Reinhard ROETZELZákladní údaje
Originální název
Fluvial deposits of the St. Marein Freischling Formation insights into initial depositional processes on the distal external margin of the Alpine Carpathian Foredeep in Lower Austria
Název česky
Fluviélní sedimenty souvrství St. Marein Freischling záznam počátečních depozičních procesů podél vnějšího okraje alpsko karpatské předhlubně v Dolním Rakousku
Autoři
NEHYBA, Slavomír (203 Česká republika, garant, domácí) a Reinhard ROETZEL (40 Rakousko)
Vydání
Austrian Journal of Earth Sciences, Wien, Austrian Geological Society, 2011, 0251-7493
Další údaje
Jazyk
angličtina
Typ výsledku
Článek v odborném periodiku
Obor
10500 1.5. Earth and related environmental sciences
Stát vydavatele
Rakousko
Utajení
není předmětem státního či obchodního tajemství
Impakt faktor
Impact factor: 0.400 v roce 2010
Kód RIV
RIV/00216224:14310/11:00049691
Organizační jednotka
Přírodovědecká fakulta
UT WoS
000286073900005
Klíčová slova česky
St. Marein-Freischling Formation - fluvial deposits - braided river - Oligocene Lower Miocene - Molasse zone - external margin - Austria
Klíčová slova anglicky
St. Marein-Freischling Formation - fluvial deposits - braided river - Oligocene Lower Miocene - Molasse zone - external margin - Austria
Změněno: 5. 4. 2012 18:37, prof. RNDr. Slavomír Nehyba, Dr.
V originále
In the SE Bohemian Massif of Lower Austria sandy and gravelly fluvial deposits of the St. Marein Freischling Formation (Oligocene Early Miocene) are reflecting a braided channel system. Eleven lithofacies and four facies associations/architectural elements (gravelly channel dunes and bars, channels, sandy channel dunes and abandoned channels) were recognised. A network of relatively shallow streams with seasonal fluctuations in the discharge are supposed. The episodic character of transport, erosion and deposition could reflect changes in climatic conditions. Provenance studies (pebble petrography, heavy minerals), evaluation of pebble size, shape and roundness, and paleocurrent data point at two parts of the fluvial system. For the main fluvial system a general transport from west to east can be supposed, which finally turned against the south in the surroundings of Horn. Tributaries both from north and south ended in the west-east reach of the main river. Deeply weathered crystalline rocks of the South Bohemian Batholith and the Moldanubian zone (Eisgarn granite, Rastenberg granodiorite, Wolfshof syenitic gneiss, Gföhl gneiss, granulites, marbles, eclogites, amphibolites) are supposed as source rocks. However, local sources strongly influenced the provenance spectra. In a second, probably separate fluvial system in the southeast, a general transport from northeast to southwest is evident, where Moravian metamorphic rocks, magmatic rocks of the Thaya Batholith, and probably reworked Mesozoic sediments are the main sources. For the position and orientation of the paleovalley the tectonic influence of the north-ward thrusting Eastern Alps is discussed, causing a back-bulge depression along the external margin of the foreland basin. Additionally, in the lower reach of the fluvial system (Horn Basin), the position of the paleovalley at the tectonic contact between the Moldanubian and Moravian zones and the reactivation of the fault-system seems to be evident. Moreover, fluvial style and discharge of the St. Marein-Freischling Formation deposits were affected by climatic processes.
Česky
Na JV okraji Českého masívu v oblasti Dolního Rakouska jsou uloženy písčité a štěrkovité sedimenty souvrství St. Marein Freischling(Oligocene- Early Miocene). Jedná se o sediment divočící řeky.
Návaznosti
| GA205/09/0103, projekt VaV |
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