NOVÉ POZNATKY O DEVÍNSKONOVOVESKOM SÚVRSTVÍ (VIEDENSKÁ PANVA, SLOVENSKO)

Klement Fordinál, Ivan Baráth, Ladislav Šimon, Milan Kohút, Alexander Nagy, Jana Kučerová

Abstrakt

Coarse-grained sediments of the Devínska Nová Ves Formation (Middle Badenian) are cropping out at the western margin of the Malé Karpaty Mts., between Devínska Nová Ves and Kuchyňa villages. In the studied area, this formation is represented by various lithofacies. The most abundant are breccia, gravel and sand. Less abundant is the presence of shale and coaly shale with lignite seams. In one place, south of the Kuchyňa village, also a presence of volcanic tuff was examined in this formation. The breccia is built by chaotic, nonstratified, mostly angular blocks and debris of granitoid rocks. Less frequent is poorly rounded debris of crystalline schists, vein quartz and quartzite in the breccia. Its matrix is silty sand and represents a material of fossil weathering rind. Locally, the Devínska Nová Ves Fm. is represented by gravel with well rounded pebbles of granitoids, quartzite and crystalline schists in the Marianka village and south of the Lozorno village. All these rock types can be derived from the Tatric units of the Malé Karpaty Mts., but their vertical distribution (MKZ-1 well) show an inverse trend, than awaited from normal stratigraphic superposition. This is an evidence of the existence of a crystalline nappe unit (Bratislava nappe), above the Mesozoic successions (Borinka unit). Most of the sediments were deposited in the lateral debris apron and alluvial fan environments. In the terminal part of the coarse grained formation, a part of the rounded gravel shows reworking by sea waves in the littoral zone, beyond the frontal part of the alluvial fans.
Sand represents a very common lithotype in the Devínska Nová Ves Formation, containing also thin intercalations of fine gravel, and 1–2 cm thick interbeds of shale. The sand is genetically related mostly to the distal alluvial sand skirt deposits, but the distal part of them, cross stratified, with reworked pebble trains, clearly show the deposition in littoral environment of alluvial deltas. Shale lithofacies is present only rarely in the Devínska Nová Ves Formation. It is represented by pale greenish grey, rusty variegated noncalcareous clay. It contains an abundant association of palynomorphs, documenting hydrophilous and riparian paleoflora.
The shales were accumulated on alluvial interfluve plains, and more distally they transit into similar delta plain facies. The tuff, found south of the Kuchyňa village, is of white and grey white color. It is matrix supported, and consists of clasts and fragments of glass. It is a product of an ash-fall of rhyolite composition. On the tuff`s bedding planes we have found imprints of leaves and lithocarps. This tuff can be probably derived from the Central Slovakian neovolcanic area, from where rhyolite volcanism is
known from the Early Badenian time only, that forces us to consider also to the Lower Badenian age of the basal part of the Devínska Nová Ves Fm., similarly like it is in the Austrian part of the Vienna Basin.

Bibliografická citace

Fordinál, K., Baráth, I., Šimon, L., Kohút, M., Nagy, A., & Kučerová, J. (2016). NOVÉ POZNATKY O DEVÍNSKONOVOVESKOM SÚVRSTVÍ (VIEDENSKÁ PANVA, SLOVENSKO). Geologické výzkumy na Moravě a ve Slezsku, 17(1-2). Získáno z https://journals.muni.cz/gvms/article/view/4726

Klíčová slova

Vienna Basin; Badenian; Devínska Nová Ves Formation; lithology; facies

Plný Text:

Reference

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