A Reiflingi esemény hatása az Északi-Mészkőalpok és az Aggteleki-hegység középső-triász fejlődésére

Abstract

Based on selected sections of the Northern Calcareous Alps (NCA) and Aggtelek Mountains, this study compares the time and the reason for the drowning of the Steinalm ramp. The investigated sections were chosen from the NCA (Upper Austoalpine Nappes), 1) Juvavikum: Schreiergraben, Schreierkogel/Schreyeralm The Steinalm Limestone Formation is light grey, bedded and in dasycladaleans (Physoporella pauciforata, Poncetella hexaster, Oligoporella pilosa, Teutloporella peniculiformis) rich grainstone, Meandrospira dinarica is also present. This formation is Pelsonian in age and signs of terrestrial influence (meteoric diagenesis, carstification) were not detected.In the Schreiergraben outcrop the lowermost layers of the Schreyeralm Limestone Formation consist of breccia. The lithoclasts originate from the Steinalm Limestone Fm. Above the breccia the limestone, bedded, homogenous "filament" wackestone can be found. This might represent a sediment of the lower slope or toe-of-slope. Conodonts from the matrix (Gondolella bulgarica, Nicoraella germanica) indicate a Pelsonian age. 20 m above the base Gondolella cornuta, G. liebermanni and Gladigondolella tethydis suggest a Lower-Middle Illyrian age (age interval between TrinodosusLiepoldti Subzones)Schreierkogel: the lower part of the Schreyeralm Limestone Fm was preserved only in red neptunian dykes of the Steinalm Limestone. The microfacies is "filament" wackestone. The ages are Late-Pelsonian (Gondolella bulgarica, G. bifurcata) and Early Illyrian (Gondolella cornuta, G. praeszaboi, G. excelsa, Gladigondolella budurovi).2) Bajuvaricum: Bajuvaricum: Nixhöhle/Frankenfels. The Annaberg Limestone is thick-bedded, light grey, slightly dolomitized limestone with pelsparitic microfacies. Upsection it is followed by 10 m-thick, thick-bedded Reifling Limestone. The microfacies is "filament" wackestone. The Gondolella bulgarica at its base is indicative of a Pelsonian age.Hocheck/Annaberg. The grey, thick bedded Annaberg Limestone consists of an alternation of mudstones and packstones containing Teutloporella peniculiformis. Meandrospira dinarica indicates a Pelsonian age. At the base of the overlaying Reifling Limestone Gondolella bulgarica also suggests a Pelsonian age.Palfau. The uppermost part of the Steinalm Limestone consists of light grey, oncoidal beds. Above it can be found thin-bedded cherty limestone (Reifling Limestone); this is very rich in conodonts although only one species (Gondolella bifurcata) is present. The age is Pelsonian.In the Aggtelek Mountains (Silica Nappe, Alcapa Megaunit), the drowning of the Steinalm platform was studied in two sections 1) Baradla Cave, 2) Nagy-Jenei Hill.The thickness of the Steinalm Limestone and the succession of the microfacies is identical across the whole area. The microfacies succession can be followed along a strike. The lower part is represented by cyclic peritidal sediments; in the upper part there are calcarenites which are rich in dasycladaleans (Physoporella pauciforata, Teutloporella penicu liformis, Poncetella h...

Middle Triassic syntectonic sedimentation and volcanic influence in the central part of the External Dinarides, Croatia (Velebit Mts.)

“…Ob ser vations have been made of var i ous vol ca nic and volcaniclastic rocks in the Mid dle Tri as sic of the South ern Alps (Crisci et al, 1984;Castellarin et al, 1988;Obenholzner et al, 1991), the Inter nal Dinarides (Pamić, 1984;Dimitrijević, 1997) and the Transdanubian Range and Bükk Mts. in Hun gary (Szoldán, 1990;Harangi et al, 1996;Velledits, 2004Velledits, , 2006Velledits et al, 2017). Vol ca nic and volcaniclastic rocks in the Velebit Mts.…”

“…There fore, their in ter pre ta tion serves as a use ful tool for un der stand ing sed i men ta tion pro cesses in the Mid dle Tri as sic. Sim i lar and broadly co eval palaeoenvironment vari abil ity, mag matic his tories and vol ca nic-volcaniclastic fa cies are vis i ble across the surround ing ar eas of the south ern shelf of the West ern Tethys (Brandner and Bechstädt, 1970;Velledits, 2004Velledits, , 2006Velledits, , 2009Kóvacs et al, 2010;Celarc et al, 2013;Velledits et al, 2017).…”

A törmelékes üledékek és kőzetek petrográfiai vizsgálati eredményei a Kárpát–Pannon térség kutatásában: a magyar kutatók hozzájárulása az elmúlt 150 évben

“…mészkő, márga, homokkő, agyagkő, kovakőzetek) dezaggregálása (törés, oldás) után kinyert nehézásványok vizsgálata a bonyolultabb mintaelőké szítési eljárás miatt később kezdődött el, de annál szélesebb körű lehetőségeket kínált. Leginkább a forráskőzet és a lehordási terület meghatározása céljából vizsgálták többek között az észak-magyarországi permi-mezozoos(ZAJZON et al 2011, VELLEDITS et al 2017) és oligo-miocén törmelékes rétegsorok egyes tagjait(PAPP & SEMPTEY 1956, KISS 1958). SZTANÓ & JÓZSA (1996) a Pétervásárai Homokkő vékonycsiszo lataiban változatos savanyú-neutrális magmás, meta -morf és üledékes kőzetfragmentumok mellett ofiolitos eredetű kőzetszemcséket (szerpentinit, metagabbró, metabazalt, radiolarit) mutattak ki, nehézásványai között ofiolitos eredetű metamorf ásványszemcséket (pl.…”