Late Variscan (Carboniferous to Permian) environments in the Circum Pannonian Region

Abstract

Abstract:The Pennsylvanian-Cisuralian late-orogenic and post-orogenic paleoenvironments of the Circum Pannonian Region (CPR) include tectono-stratigraphic sequences developed from the Upper Bashkirian-Moscovian marine early molasse stage up to the Guadalupian-Lopingian post-orogenic stage, with gradual connection to the beginning of the Alpine (Neotethyan) sedimentary cycle. Shallow marine siliciclastic or carbonate siliciclastic overstep sequences started in the internal part of the Variscan orogenic belt during the latest Serpukhovian and Bashkirian-Moscovian. They overlapped unconformably the variably metamorphosed Variscan basement, or weakly deformed and metamorphosed foreland and syn-orogenic flysch sediments of Mississippian to Early Pennsylvanian age. The post-Variscan rifting largely affected the Variscan orogenic belt by reactivation of the Variscan lithosphere. The late-to post-orogenic terrestrial sequences started within the internal part of the Variscan orogenic belt during the Middle/Late Pennsylvanian. It continued gradually to terrestrial-shallow water carbonate-siliciclastic sequences in its external part through the Permian. According to the present configuration, the Alpine (Neotethyan) northward shifting transgression started during the Guadalupian/Lopingian in the South and during the Early Triassic in the North.

First evidence for Permian-Triassic boundary volcanism in the Northern Gemericum: geochemistry and U-Pb zircon geochronology

“…The first was during the Early Pennsylvanian (Bashkirian) and the second in the Late Pennsylvanian (Kasimovian-Ghzelian). Both hiati were connected with gradual reconstruction of the NGU sedimentary realm, at the first stage in a transpressional and the second in a transtensional tectonic setting (Vozárová et al 2009a). This assumption is documented by a different pretransgressive erosion step of individual pre-Pennsylvanian sequences and by their reworked detrital material.…”

Pedogenic calcrete records in southern Transdanubia, Hungary: A brief review with paleoenvironmental and paleogeographic implications

“…On the other hand, considered within a Circum-Pannonian context, the depositional basin of the Korpád Formation is well correlated with the Permian basins of the Western Carpathians and the Eastern Alps (Alcapa Block). The Cisuralian sediments of the Zemplinicum (the Cejkov and Cernochov Formations) were deposited in an alluvial fan setting alterCentral European Geology 57, 2014 nating with floodplain or ephemeral lake deposits with calcrete horizons, all showing the typical features of semiarid/arid climatic conditions (Vozárová et al 2009(Vozárová et al , 2010. Additionally, calcrete horizons together with lenses of dolomite and gypsum occur locally in the Hronicum Cisuralian sequence (the Malu iná Formation) comprising a thick succession of alternating conglomerate, sandstone and shale deposited in braided alluvial and fluvial-lacustrine environments in a semiarid/arid climate (Vozárová et al 2009(Vozárová et al , 2010Vdacný et al 2013).…”

“…The Cisuralian sediments of the Zemplinicum (the Cejkov and Cernochov Formations) were deposited in an alluvial fan setting alterCentral European Geology 57, 2014 nating with floodplain or ephemeral lake deposits with calcrete horizons, all showing the typical features of semiarid/arid climatic conditions (Vozárová et al 2009(Vozárová et al , 2010. Additionally, calcrete horizons together with lenses of dolomite and gypsum occur locally in the Hronicum Cisuralian sequence (the Malu iná Formation) comprising a thick succession of alternating conglomerate, sandstone and shale deposited in braided alluvial and fluvial-lacustrine environments in a semiarid/arid climate (Vozárová et al 2009(Vozárová et al , 2010Vdacný et al 2013). Furthermore, in the Drauzug and in the Gurktal Nappe (the Laas Formation and the Werchzirm Formation, respectively), proximal to distal alluvial red-beds, grading into fine-grained sandflat-playa complexes locally with calcrete crust, characterize the Cisuralian (Vozárová et al 2009(Vozárová et al , 2010.…”

“…Additionally, calcrete horizons together with lenses of dolomite and gypsum occur locally in the Hronicum Cisuralian sequence (the Malu iná Formation) comprising a thick succession of alternating conglomerate, sandstone and shale deposited in braided alluvial and fluvial-lacustrine environments in a semiarid/arid climate (Vozárová et al 2009(Vozárová et al , 2010Vdacný et al 2013). Furthermore, in the Drauzug and in the Gurktal Nappe (the Laas Formation and the Werchzirm Formation, respectively), proximal to distal alluvial red-beds, grading into fine-grained sandflat-playa complexes locally with calcrete crust, characterize the Cisuralian (Vozárová et al 2009(Vozárová et al , 2010.…”

“…1C), Permian siliciclastic and volcaniclastic rocks were deposited in continental strike-slip and rift-related basins, belonging to the internal part of the Variscan orogenic domain (Barabás and Barabásné Stuhl 1998;Vozárová et al 2009). Among these units, the fine-grained siliciclastic deposits of the Cisuralian Korpád Sandstone Formation are distinctive in terms of the presence of nodular calcretes with rhizocretions (Varga 2009;Varga et al 2012).…”