|
Fritz Ebner, University Leoben (Austria)
Anna Vozárová, Comenius University (Slovakia)
Jozef Vozár, Geological Institute of SAS (Slovakia)
Sándor Kovács, Eötvös Loránd University (Hungary)
|
|
ALCAPA (Eastern Alps/Austria; Central West Carpathians/Slovakia; basement of the northern Pannonian Basin with isolated outcrops of the Pelso Composite Terrane/Hungary) is one of the megaterranes of the Circum Pannonian domain that was amalgamated from the Middle Jurassic till the Early Miocene. Significantly, the Late Paleozoic units of ALCAPA are affected differently by the Variscan orogeny suggesting that they were derived from individual areas. Regarding Devonian - Permian sedimentation and Variscan metamorphism and deformation the following zones had been distinguished (Ebner et al. 2008; Vozarova et al. 2008):
(1) Variscan metamorphic zones in the Eastern Alps and Western Carpathians.
(2) Veitsch-Notsch-Szabadbatty-Ochtina Zone, with beginning of the sedimentation in foreland/remnant basins in the front of zones (1) during the Early Carboniferous.
(3) Oceanic and volcano-sedimentary units in parts of the Eastern Alps and W-Carpathians affected by the Mid-Carboniferous event and with the unconformable continental cover.
(4) Siliciclastic turbiditic or pelagic carbonate environments without Variscan deformation and metamorphism (parts of the Graz Paleozoic; Szendro, Uppony Mts.) until the Bashkirian.
(5) Late Pennsylvanian - Permian shallow marine sediments concordantly following (4) in the Bukk and Uppony Mts.
(6) Continental molasse environments above (1-3).
The pre-orogenic units (1, 3) were accreted to the active Laurussian margin during the Variscan orogeny and derived from Paleozoic oceanic domains between Laurussia and Gondwana. Parts of the Pelso C.T. are characterized by 4 and 5. During the Late Paleozoic they were connected with the Dinaridic Sana-Una and the Serbian Jadar Paleozoics. This Bukk-Jadar zone had a somehow equatorial position westwards of the ending of the Carboniferous Paleotethys, which remained an open oceanic segment at the end of the Variscan period (Karamata 2006).
|
