6th Annual Conference of SEPM-CES, SEDIMENT 2009
Kraków 24-25 VI 2009
Pre-Conference

Pre-Conference Field Trip  A2. 22-23 VI  [cancelled]
SEDIMENTATION IN FRONT OF PROGRESSING ACCRETIONARY WEDGE: EXAMPLES FROM PALEOGENE OF THE POLISH CARPATHIANS

Leaders:  S. Leszczyński and M. Warchoł

Fee:  130 €  

This field trip will visit the late Eocene (Priabonian) to early Oligocene (Rupelian) sedimentary succession in several sections in the central part of Beskid Niski mountain range and in one section in Pogórze Rożnowskie foothills (Outer Carpathians, 100 to 180 km southeast of Krakow). The succession in the first mentioned area is up to 1400 m thick, dominated by thick-bedded, siliciclastic turbidites with significant admixture of other gravity flow deposits (Magura Beds). It was deposited in oxic conditions, in a trough-type, deep-sea, confined basin (outer part of Magura Basin, inner sector of the Carpathian Flysch Sea) bounded by frontal parts of gradually progressing accretionary wedge and by intrabasinal ridge (Silesian ridge). Its deposition resulted from popping-up of the ridge, steered by the accretionary wedge progression. The succession in the second area is only several tens of metres thick, dominated with different deep-sea, fine-grained deposits. In the Rupelian, black-shale facies prevails, with some cherts and siliceous marlstones (Menilitic Beds). Lithostratigraphy of the succession is here typical for the whole remaining outer zone of the Outer Carpathians. It was deposited in the outer part of the Carpathian Flysch Sea, that was not affected yet by the accretionary wedge development. Sedimentation was controlled here similarly like along the major part of the northern margin of the European Alpine orogenic belt. In contrast to the Magura Basin, extensive anoxia occurred here in the Rupelian.

The outcrops are located in beds and banks of charming stream channels, in a tor and a several tens of metres long erosion scarp. Detailed observations of sedimentary fabrics and facies arrangement will be possible. Lithostratigraphic correlation of outcrop sections in the visited part of the Beskid Niski will indicate architecture of the sedimentary succession and its depositional system.

Itinerary:
Kraków - Brzesko - Gorlice - Siary - Ropica Górna - Małastów - Folusz - Mrukowa - Znamirowice - Brzesko - Kraków

Practical information


The outcrops are easily accessible, however, mainly in rubber boots. At this time of the year, the weather is rather unstable. Average temperatures range from 17°C to 18°C. Rains and storms are possible. Look to the weather forcast:  http://www.weatheronline.co.uk/Poland.htm  (select Nowy Sacz).

Channelized sandstone (high-density turbidity current deposit) incised into channel margin deposits.
Magura Beds, Priabonian, Ropica Górna (Beskid Niski)
Channel fill sandstone, amalgamated beds of high-density turbidity current deposits and sandy debris flow deposits. Magura Beds, Rupelian, Diabli Kamień (Devil's Tor), Folusz (Beskid Niski) Complex flute casts. Magura Beds, Rupelian, Siary (Beskid Niski)
Intraformational breccia (fragment of slump; channel margin deposits). Magura Beds, Priabonian, Ropica Górna (Beskid Niski) Slump-folded package underlain by undeformed mudstones (interchannel deposits). Magura Beds, Priabonian?, Ropica Górna (Beskid Niski)
Coarsening-upward turbidite package (channel frontal-spaly deposits). Magura Beds, Priabonian?, Siary (Beskid Niski) Channel-levee deposits. Magura Beds, Priabonian, Ropica Górna
(Beskid Niski)
Variously current laminated and convoluted sandstone from channel-levee package. Magura Beds, Priabonian, Ropica Górna (Beskid Niski) Banded mudstone with subordinate siltsone layers (turbidite and hemipelagite interchannel deposits). Priabonian?, Ropica Górna
(Beskid Niski)
Ophiomorpha rudis on lower surface of turbidite sandstone Rupelian? (Magura Beds), Mrukowa (Beskid Niski) Cherts, siliceous marlstones and black shales coloured by weathering products. Central part of Rupelian (Menilitic Beds) at Znamirowice
(Pogórze Rożnowskie foothills)