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Geological setting and lithological inventory of the Czarna Woda conglomerates (Magura Nappe, Polish Outer Carpathians)

Oszczypko Nestor, Oszczypko-Clowes Marta, Olszewska Barbara

Acta Geologica Polonica

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2020

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Vol. 70, no. 3

397--418

EN

During the late Oligocene to early Miocene the residual Magura Basin was located along the front of the Pieniny Klippen Belt (PKB). This basin was supplied with clastic material derived from a south-eastern direction. In the Małe (Little) Pieniny Mts. in Poland, the late Oligocene/early Miocene Kremna Fm. of the Magura Nappe (Krynica subunit) occurs both in front of the PKB as well as in the tectonic windows within the PKB. Lenses of exotic conglomerates in the Kremna Fm. contain frequent clasts of Mesozoic limestones (e.g. limestones with “filaments” microfacies and Urgonian limestones) and Eocene shallow-water limestones. Fragments of crystalline and volcanic rocks occur subordinately. The provenance of these exotic rocks could be probably connected with Eocene exhumation and erosion of the SE part of the Dacia and Tisza Mega-Units.

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Egzotyki strefy krynickiej (płaszczowina magurska) i ich znaczenie paleogeograficzne

Oszczypko N., Oszczypko-Clowes M., Salata D.

Geologia / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie

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2006

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T. 32, z. 1

21-45

PL

Poziomy egzotykowe w strefie krynickiej grupują się w utworach formacji szczawnickiej, zarzeckiej i magurskiej. Wśród egzotyków skał osadowych strefy krynickiej rozpoznano: pelagiczne wapienie tytonu-neokomu oraz litotamniowe wapienie paleogenu. W egzotykach magmowych większość to wulkanity, natomiast skały metamorficzne to głównie łupki łyszczykowe i gnejsy. Egzotyki skał osadowych i krystalicznych strefy krynickiej różnią się od tych z formacji jarmuckiej (mastrycht--paleocen) jednostki Grajcarka. Egzotyki eocenu i oligocenu strefy krynickiej nie wykazują bezpośredniego związku z pienińskim pasem skałkowym, a skały krystaliczne pochodzą z erozji terranu kontynentalnego. Pochodzenie egzotyków może być związane z eoceńską ekshumacją podłoża basenu magurskiego lub z domeną wewnętrznokarpacką (wewnętrzne Dacydy i/lub terran Cisy (Tisza))

EN

Sedimentary beds containing exotic pebbles occur in the Krynica Subunit. They occur mainly in deposits of the Szczawnica, Zarzecze and Magura fms. Pelagic limestones (Tithonian- -Neocomian) and lithothamnium limestones (Palaeogene) were recognized among sedimentary rocks of the Krynica Zone. Volcanites, rarely granitoides as well as schists, gneisses, quartzites and cataclasites were found in the group of crystalline exotic pebbles. The exotic pebbles from the Eocene--Oligocene beds of the Krynica Zone differ from those found in the Jarmuta Fm (Maastrichtian--Palaeocene) of the Grajcarek Unit. The exotic pebbles of the Krynica Subunit do not have direct connection with the Pieniny Klippen Belt, whereas crystalline rocks derived from a continental terrain. The provenance of these rocks could be connected with Eocene exhumation of the Magura Basin basement or with the Inner Carpathian realm (Inner Dacides and/or Tisza terrain)

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Provenance analyses of the Late Cretaceous-Palaeocene deposits of the Magura Basin (Polish Western Carpathians) : evidence from a study of the heavy minerals

Oszczypko N., Salata D.

Acta Geologica Polonica

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2005

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Vol. 55, no. 3

237-267

EN

The Late Cretaceous-Palaeocene sequence of the Magura Nappe in Poland is underlain by the Albian-Cenomanian spotty marls at the base and overlapped by the Palaeocene/Early Eocene variegated shales at the top. The spotty marls are followed by variegated shales and then by turbiditic deposits. The upper boundary of the variegated shales is diachronous - older in the Raca zone (Santonian) and younger in the Krynica zone (Campanian/Maastrichtian). The turbiditic deposits of the marginal (northern) zone of the Magura Nappe display palaeocurrent directions from the NW in the western part and from the NE in the eastern part. In other parts of this unit palaeocurrent directions from the SE and E were observed. The northern source area of the Magura Basin is commonly connected with the Silesian Ridge, while the south-eastern one could be connected with an accreted fragment of the Inner Carpathians.The heavy mineral assemblages of the Magura Nappe are dominated by stable and ultrastable species. Chromian spinels occur additionally in the Krynica zone and to some extent in the Bystrica and Raca zones. Investigation of the chemical composition of the heavy minerals showed that that the southern source area was built of low- to medium-grade metamorphic rocks, as well as igneous rocks associated with ophiolite sequences. The chemical composition of minerals deriving from the NW indicates that they crystallized mainly in low- to high-grade metamorphic rocks and granitoids.