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Tethyan - Boreal Connection During the Pliensbachian (Western Carpathians): an Evidence from Ammonite Fauna

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Tethyan - Boreal Connection During the Pliensbachian (Western Carpathians): an Evidence from Ammonite Fauna 223 Slovak Geol. Mag. 6, 2-3(2000). 223-228 Tethyan - Boreal connection during the Pliensbachian (Western Carpathians): an evidence from ammonite fauna. Andrej Bendik Geological Institute, Slovak Academy of Science Bratislava, Severna 5, 974 01 Banska Bystrica, Slovak Republic Abstract: A distribution of Liassic ammonites provides an important tool for correlation between the Tethyan and Euroboreal realms in the Central Western Carpathians. Liassic ammonites described herein come from the Adnet Formation in the Vel'ka Fatra Mts. (Frckov and Rovne valleys). Adnet limestones with ammonites occur in Jurassic sequence of the Zliechov Succession, belonging to the Krizna Nappe. The study of the FrCkov section allows to distinguish a set of 12 ammonite biozones within the Adnet Fm. The ammonites of the Adnet Fm. belong to the Raricostatum Zone (Sinemurian) - Jamesoni, Ibex, Davoei, Margaritatus and Spinatum zones (Pliensbachian) - and Tenuicostatum, Falcifer, Bifrons, Variabilis, Thouarsense, Levesquei zones (Toarcian). The results of this study indicate a mixing of the Boreal and Tethyan ammonite fauna dur- ing Pliensbachian, whereas the Tethyan ammonite fauna became dominant during the Toarcian. Key words: Central Western Carpathians, Zliechov Succession, Lias, ammonites, biostratigraphy, paleobio- geography Introduction Lithological description Liassic Adnet Formation was introduced by Hauer The Frfikov and Rovn6 localities are situated in SW part (1853) in the Eastern Alps. The type locality of these sedi- of the Vel'ka Fatra Mts., between the Krizna hill (1574 m) ments occur in a quarry near Adnet in the Salzburg area. and Ostredok hill (1592 m). First locality occurs on the Hohenegger (1867) used this name for red limestones in the right slope of the Rovne Valley and second one in higher saddle of the Vel'ky Sturec Hill in the Vella Fatra Mts. part of the valley. The localities were studied by Rakus (in This locality was also mentioned by Stur (1860). MiSik & Rakus, 1964) and Perzel (1967), acquiring the The Adnet formation occur within the Liassic succes- Liassic - Cretaceous fauna of ammonites. The thickness of sions of the Krizna Nappe in the Central Western Carpathi- whole sequence in outcrops is about 570 m, comprising of ans (CWC) and in the Silica Nappe near the Gemerska Upper Triassic to Early Cretaceous sediments. Kovacova in the Miglinc river (Kollarova & Andrusovova, The lower part of the Fr£kov section is formed by the 1966). MiSik & Rakus (1964) described a microfacies Keuper Formation with red, grey and green marls inter- character and faunal composition of the Upper Triassic - calated by yellow sandstones. Upper part of the Keuper Liassic sediments of the Krizna Nappe from the Vel'ka Fm. consists of white - grey dolomites. This formation Fatra Mts. Short reports resulted from geological mapping reaches a thickness of about 130 m. of this area of Polak et al. (1996). The sequence grades up to the Rhaetian sediments of The CWC were part of the Tethyan Realm. In spite of the Fatra Formation. This formation comprises massive this, the Adnet Lms. in the FrCkov quarry contain a fre- beds of organogenic, organodetritic, brachiopod-rich and quent ammonites of boreal fauna. Paleobiogeography of crinoidal limestones with layers of dolomites. This sec- the Tethyan - Boreal realms has been evaluated by Enay tion has been described for the first time by Michalik (1980) and Enay & Mangold (1982). Early Jurassic fauna (1974, 1976). with Tethyan and Boreal ammonites has been described Higher up in the section, the Sinemurian - Middle by Dommergues et al. (1983), Dommergues & Meister Hettangian sediments of the Kopienec Formation follows. (1987, 1991), Blau & Meister (1991), Geczy & Meister They comprise brown, grey and red marls with intercala- (1994, 1998), Alkaya & Meister (1995) and Blau (1998). tions of yellow sandstones (3-5 cm) and massive crinoi- Similar distribution of ammonite fauna in the Northern dal limestones (up to 5 m). In the top of this formation, Calcareous Alps has been recorded by Meister & BOhm gray - green and pink oncoidal massive limestones with (1993) and Dommergues et al. (1995). Ammonite collec- chlorite occur. New information about deep-water chlo- tion obtained from the FrCkov and Rovne localities com- rite oncoides from the Toarcian sediments has been given prises 54 specimens with very different degree of preser- byMiSik&Sucha(1997). vation (suture lines are possible to study only in rare The Adnet Formation is developed in thickness of cases). about 14 m (Fig. 1). The study of this formation allows to Geological Survey of Slovak Republic, Dionyz Stur Publishers, Bratislava 2000 ISSN 1335-96X Slovak Geol. Mag, 6, 2-3(2000), 223-228 224 Fig. 1 Lithological profile of the Frckov section 225 distinguish two lithological parts. The lower part con- Early Pliensbachian (Carixian) sists of pink or reddish thin-bedded limestones (10-30 Jamesoni Zone cm) with intercalations of dark red marls. This part is Jamesoni Subzone characterized by the frequent appearance of nodules. Characteric ammonites of this horizon are represented The upper part of the formation comprises of dark red by following species: Uptonia jamesoni, Coeloceras sp. marly limestones and marls with layers of green - light (cf . C. pettos), Phylloceras sp., Audaxlytoceras sp. and red nodular limestones. Nodules have a pink - light red Lytoceras sp.. colours and size between 3-15 cm. They disappear in the uppermost part of the Adnet Fm. Nodules frequently Ibex Zone contain a autoclasts and rock cores of ammonites. The Masseanum Subzone rostra of belemnites are frequent as well, showing a Horizon is associated by Juraphyllites sp., Lytoceras chaotic distribution due to semiplastic deformation of sp., Tropidoceras sp. and Tropidoceras cf . masseanum. unlitified sediments on submarine slopes. In the lower Last mentioned species is characteristic for lowermost part of section, the belemnites form a relatively large part of Ibex Zone - Masseanum Subzone rostra (10 - 13 cm long and 0,8 - 1,5 cm in diameter), Valdani Subzone and higher up their size decreases (5-7 cm). Ammonite fauna have been collected by bed by bed study (Bendik, This horizon contains a poor ammonite fauna. In frag- 1999, Fig. 1) and using of Perzel's collection ments there was observed these speciec: Acanthopleuro- (unstratified and publicated). ceras sp. (cf . A. valdani), Acanthopleuroceras binotatum, General microfacial character of the Adnet limestones Lytoceras sp. Vicininodiceras sp. and marls corresponds to biomicrite (Folk 1959, 1962), in lower part observed as wackstone and in upper part as Davoei Zone wackstone - packstone and packstone. Maculatum Subzone Limestones in upper part of the Adnet Fm. are grey, Ammonite fauna from this subzone is very well pre- thin-bedded and rich in crinoidal detritus. They are sup- served, representing by Androgynoceras maculatum. posed to be calciturbidite. Capricornus Subzone Successive sediments are red, grey or green and thin- From this zone, only one ammonite species of Andro- bedded radiolarite limestones and radiolarites. The green gynoceras capricornus has been found. colour indicates diagenetic fluid alteration in redox con- Capricornus - Figulinum Subzones ditions. Radiolarites consists of numerous green or red The boundary of Capricornus and Figulinum subzones cherts. The thickness of radiolarite section is about 70 m. is presented by Prodactylioceras davoei. This horizon is The uppermost part of sequence is composed of grey represented by Calliphyloceras nilsoni, Zetoceras sp. (cf. marly limestones with aptychi, light-grey thin-bedded Z. zetes) and Lytoceras sp. Upper part of the Davoei marly limestones and marls with deformyted rock cores Zone, which corresponds to Angulatum Horizon in NW of ammonites. The thickness of this section is about Europe, is indicated by Angulaticeras cf . angulatum. 300 m. Late Pliensbachian (Domerian) Biostratigraphical framework Margaritatus Zone 17 ammonite subzones, which have been recognized Amaltheus margaritatus known from Perzel's collec- in the Frckov section, are correlable with two standard tion and Arieticeras algovianum is typical ammonite of zonations known from the NW Europe (Dean et al., 1961) this zone. and for the Tethyan realm (Ferretti, 1990). Stokesi Subzone Late Sinemurian This subzone represented Protogrammoceras cf . nor- Raricostatum Zone manianum and belongs to NW European Celebratum Ho- Raricostatum Subzone rizon (Blau & Meister, 1991). Fuciniceras compressum, Fuciniceras sp. and Arie- From this zone following ammonites were found: ticeras sp. belong in widely extent to the Margaritatus Echioceras raricostatum, Echioceras raricostatoides, Zone. Paltechioceras favrei and Paltechioceras cf . boehmi. They belong to the Boehmi Horizon of Raricostatum Spina turn Zone Subzone in NW Europe (Meister, 1991, Dommergues, Apyrenum Subzone Meister & Bohm, 1995, Blau, 1998). Pleuroceras cf . solare is only one of amfi Macdonnelli Subzone cies, finding in this subzone. This subzone is defined by occurrence of Paltechio- Hawskerense Subzone ceras cf . charpentieri (Blau, 1998) and Leptechioceras cf. meigeni, representing a typical ammonites of Macdonnelli This subzone is represented by Pleuroceras cf. Subzone. hawskerense and Pleuroceras cf . spinatum. Slovak Geol. Mag., 6, 2-3(2000), 223-228 226 Fig. 2 Ammonite faunal composition andpaleobiogeographical affni ites. Lower Toarcian Bifrons Zone Tenuicostatum Zone Commune Subzone This zone is presented by Dactyliceras sp. and Lyto-
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