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

J 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 and Reinhard ROETZEL

Basic information

Original name

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

Name in Czech

Fluviélní sedimenty souvrství St. Marein Freischling záznam počátečních depozičních procesů podél vnějšího okraje alpsko karpatské předhlubně v Dolním Rakousku

Authors

NEHYBA, Slavomír (203 Czech Republic, guarantor, belonging to the institution) and Reinhard ROETZEL (40 Austria)

Edition

Austrian Journal of Earth Sciences, Wien, Austrian Geological Society, 2011, 0251-7493

Other information

Language

English

Type of outcome

Article in a journal

Field of Study

10500 1.5. Earth and related environmental sciences

Country of publisher

Austria

Confidentiality degree

is not subject to a state or trade secret

Impact factor

Impact factor: 0.400 in 2010

RIV identification code

RIV/00216224:14310/11:00049691

Organization unit

Faculty of Science

UT WoS

000286073900005

Keywords (in Czech)

St. Marein-Freischling Formation - fluvial deposits - braided river - Oligocene Lower Miocene - Molasse zone - external margin - Austria

Keywords in English

St. Marein-Freischling Formation - fluvial deposits - braided river - Oligocene Lower Miocene - Molasse zone - external margin - Austria

Abstract

ORIG CZ

In the original language

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.

In Czech

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.

Links

GA205/09/0103, research and development project

Name: Mělkovodní ekosystémy středního miocénu Centrální Paratethydy: Sukcese a interakce anorganické a organické složky ekosystémů

Investor: Czech Science Foundation

Cite

NEHYBA, Slavomír and Reinhard ROETZEL. 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. Austrian Journal of Earth Sciences. Wien: Austrian Geological Society, 2011, vol. 100, No 2, p. 50-80. ISSN 0251-7493.

@article{922959,
   author = {Nehyba, Slavomír and Roetzel, Reinhard},
   article_location = {Wien},
   article_number = {2},
   keywords = {St. Marein-Freischling Formation - fluvial deposits - braided river - Oligocene Lower Miocene - Molasse zone - external margin - Austria},
   language = {eng},
   issn = {0251-7493},
   journal = {Austrian Journal of Earth Sciences},
   title = {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},
   volume = {100},
   year = {2011}
}

TY  - JOUR
ID  - 922959
AU  - Nehyba, Slavomír - Roetzel, Reinhard
PY  - 2011
TI  - 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
JF  - Austrian Journal of Earth Sciences
VL  - 100
IS  - 2
SP  - 50-80
EP  - 50-80
PB  - Austrian Geological Society
SN  - 02517493
KW  - St. Marein-Freischling Formation - fluvial deposits - braided river - Oligocene Lower Miocene - Molasse zone - external margin - Austria
N2  - 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.
ER  -

NEHYBA, Slavomír and Reinhard ROETZEL. 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. \textit{Austrian Journal of Earth Sciences}. Wien: Austrian Geological Society, 2011, vol.~100, No~2, p.~50-80. ISSN~0251-7493.

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