Integrated Rhaetian foraminiferal and conodont biostratigraphy from the Slovenian Basin, eastern Southern Alps

Gale, Luka; Kolar‐Jurkovšek, Tea; Šmuc, Andrej; Rožič, Boštjan

doi:10.1007/s00015-012-0117-1

Cited by 26 publications

(17 citation statements)

References 68 publications

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“…Age: Conodont species Epigodonella ex gr. bidentata Mosher, Misikella hernsteini (Mostler), Misikella posthern steini Kozur & Mock, and Oncodella paucidentata (Mostler) were recovered from the lower 7 m of logged Bača Dolomite, confirming the Rhaetian age of this interval (e.g., Buser et al 2008;Gale et al 2012). Only fragments of conodonts were found from the overlying bedded part of the Bača Dolomite, up to the megabreccia.…”

Section: Liščak Sectionsmentioning

confidence: 64%

“…Porezen in the Kobla Nappe, which is composed of the northernmost outcrops of the SB. In these sections the Triassic-Jurassic transition is marked by a continuous limestone succession from the Upper Norian/Rhaetian Slatnik Formation to the Krikov Formation (Rožič et al 2009;Gale et al 2012). Both formations are marked by alternating hemipelagic limestones and carbonate turbidites and debrites characteristic of proximal basin plain -lower slope environments.…”

Section: Discussionmentioning

confidence: 99%

“…An interval several meters thick and dominated by distinct thin-bedded limestones occurs just above the Triassic/Jurassic boundary, but general succession shows no prominent facies alternations, which is in accordance with the previously described eastward decrease in subsidence. However, a combined carbon-isotope study and biostratigraphic analysis indicates a gap at the Triassic/Jurassic boundary (Gale et al 2012;Rožič et al 2012), which again can be attributed to the increasing slope inclination that resulted in erosion or by-pass of the slope area.…”

Section: Discussionmentioning

confidence: 99%

“…In the westernmost part of the Podmelec Nappe, the Bača Dolomite passes upwards into massive dolomite (partly logged in this study). In the northern part of the basin the Late Norian and Rhaetian Slatnik Formation, composed of alternating hemipelagic limestones and calciturbidites, overlies the Bača Dolomite (Rožič et al 2009(Rožič et al , 2013Gale et al 2012).…”

Section: General Overviewmentioning

confidence: 99%

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Sedimentary record of subsidence pulse at the Triassic/Jurassic boundary interval in the Slovenian Basin (eastern Southern Alps)

Rožič¹,

Jurkovšek²,

Rožič³

et al. 2017

Geologica Carpathica

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In the Alpine Realm the Early Jurassic is characterized by the disintegration and partial drowning of vast platform areas. In the eastern part of the Southern Alps (present-day NW Slovenia), the Julian Carbonate Platform and the adjacent, E-W extending Slovenian Basin underwent partial disintegration, drowning and deepening from the Pliensbachian on, whereas only nominal environmental changes developed on the large Dinaric (Friuli, Adriatic) Carbonate Platform to the south (structurally part of the Dinarides). These events, however, were preceded by an earlier - and as yet undocumented extensional event - that took place near the Triassic/Jurassic boundary. This paper provides evidence of an accelerated subsidence from four selected areas within the Slovenian Basin, which show a trend of eastwardly-decreasing deformation. In the westernmost (Mrzli vrh) section - the Upper Triassic platform-margin - massive dolomite is overlain by the earliest Jurassic toe-of-slope carbonate resediments and further, by basin-plain micritic limestone. Further east (Perbla and Liščak sections) the Triassic-Jurassic transition interval is marked by an increase in resedimented carbonates. We relate this to the increasing inclination and segmentation of the slope and adjacent basin floor. The easternmost (Mt. Porezen) area shows a rather monotonous, latest Triassic-Early Jurassic basinal sedimentation. However, changes in the thickness of the Hettangian-Pliensbachian Krikov Formation point to a tilting of tectonic blocks within the basin area. Lateral facies changes at the base of the formation indicate that the tilting occurred at and/or shortly after the Triassic/Jurassic boundary

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Section: Liščak Sectionsmentioning

confidence: 64%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: General Overviewmentioning

confidence: 99%

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Sedimentary record of subsidence pulse at the Triassic/Jurassic boundary interval in the Slovenian Basin (eastern Southern Alps)

Rožič¹,

Jurkovšek²,

Rožič³

et al. 2017

Geologica Carpathica

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“…The acidification of oceanic water greatly influenced carbonate-secreting organisms like corals and calcareous sponges, and many of the marine groups experienced elevated extinction rates (Hautmann, 2004;KiesslinG et al, 2007KiesslinG et al, , 2009. Among the strongly affected organisms were also foraminifera, microscopically small, mostly marine, unicellular eukaryotes, which by the end of the Triassic formed diverse shallow-water communities composed of Involutinoidea, Duostominidae, Lagenida, Miliolida and Textulariida (Galli et al, 2005;mancinelli et al, 2005;Gale, 2012;Gale et al, 2012). The change to Early Jurassic assemblages, almost completely dominated by agglutinated forms, is a striking example of community replacement.…”

Section: Introductionmentioning

confidence: 99%

Early Jurassic foraminiferal assemblages in platform carbonates of Mt. Krim, central Slovenia

Gale¹,

Kelemen²

2017

Geologija

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During the Early Jurassic, the subtropical carbonate platforms of the peri-Tethys Ocean experienced significant changes in their architectures, as well as in their biota compositions. Shallow-water carbonates from the northern part of the ancient Adriatic Carbonate Platform (External Dinarides) were investigated in six sections, which taken together cover the development of the platform from deposition of the uppermost Triassic Main Dolomite to the middle Lower Jurassic, lithiotid limestone. Our aim was to establish a detailed foraminiferal biostratigraphy and to observe the changes in size, abundance and diversity of foraminifera in different types of facies. As a result, the succession was successfully divided into stage or substage levels. Foraminiferal assemblages were shown to experience a gradual change in taxonomic composition (including an increase in the proportion of complex agglutinated forms), a general increase in abundance of specimens, and greater diversity in each facies type, except in bindstone and mudstone. Notable is the difference between Hettangian assemblages, which display fairly uniform compositions in all facies types and the predominance of opportunists, and the post-Hettangian assemblages, which become progressively more species-rich and where the differences in facies are perhaps more pronounced. Changes in the size of the species Meandrovoluta asiagoensis Fugagnoli & Rettori, and of the largest specimen in the assemblages, however, are less clear, but are arguably present. Faunal changes roughly correspond to the gradual change from the flat-top platform of the upper Triassic -Hettangian, where biota would be repeatedly subjected to stressed peritidal conditions, to a platform differentiated into lagoon, sand bars and ephemeral emergent areas, offering numerous habitats and perhaps more stable living conditions for organisms. IzvlečekKarbonatne platforme območja Tetide so v času starejše jure doživljale znatne spremembe v morfologiji in sestavi biote. Plitvomorske karbonate Jadranske karbonatne platforme (Zunanji Dinaridi) smo raziskali v šestih profilih na širšem območju Krima. Profili skupaj zajemajo interval od vrhnjega dela, glavnega dolomita do litiotidnega apnenca. Naš cilj je bil identifikacija foraminifernih biocon. Poleg same taksonomske sestave smo beležili še raznolikost foraminifernih združb, pogostnost (ali gostoto) foraminifer ter spremembo v velikosti vrste Meandrovoluta asiagoensis Fugagnoli & Rettori ter v velikosti največjih primerkov v združbah. Po pričakovanjih rezultati kažejo postopne spremembe v taksonomski sestavi foraminifernih združb, vključno z naraščanjem deleža kompleksnih aglutiniranih vrst ter splošen porast gostote primerkov in raznolikosti v vseh faciesih razen v bindstone in mudstone faciesih. Zanimivo je, da hettangijske združbe izkazujejo precejšnjo podobnost v sestavi in prevlado oportunističnih vrst, medtem ko so razlike med združbami glede na facies v mlajših plasteh bolj izrazite. Sprememba v velikosti vrste M. asiagoensis je znotraj p...

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New Upper Triassic Conodont Biozonation of the Tethyan Realm

Rigo

Mazza

Karádi

et al. 2017

Topics in Geobiology

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Conodonts are biostratigraphically very important microfossils in the Upper Triassic, occurring in different marine habitats, from deep-ocean to shallowshelf waters. Because of their great abundance, worldwide distribution, strong resistance to rock metamorphism, and mineralogical composition that makes them reliable tools for biostratigraphic and geochemical studies, conodonts have proven to be important tools in defining the Geological Time Scale (GTS) and Global Stratotype Section and Points (GSSPs). We present here an original Upper Triassic conodont biozonation for the Tethyan Realm integrated, where possible, with ammonoid and radiolarian zones, providing also numerical ages for stages and substages. Based on the most recent conodont biostratigraphic and systematic studies, we propose a subdivision of the Upper Triassic interval into 22 conodont zones (nine for the Carnian, ten for the Norian, and three for the Rhaetian), correlated, where possible, with the most recent North American conodont zonations. Discussions on the most biostratigraphically important conodont taxa are also provided, in particular for the stratigraphic intervals around the base of the Norian and Rhaetian stages, the GSSPs of which have yet to be defined. In this view, we provide data supporting the validity of conodonts as reliable tools for global correlations, recommending two conodont biovents as possible primary biomarkers: the FAD (First Appearance Datum) of Metapolygnathus parvus for the base of the Norian and the FAD of Misikella posthernsteini for the base of the Rhaetian. The conodont species Norigondolella carlae n. sp. from the upper Tuvalian (Carnian) is also defined.

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Integrated Rhaetian foraminiferal and conodont biostratigraphy from the Slovenian Basin, eastern Southern Alps

Cited by 26 publications

References 68 publications

Sedimentary record of subsidence pulse at the Triassic/Jurassic boundary interval in the Slovenian Basin (eastern Southern Alps)

Sedimentary record of subsidence pulse at the Triassic/Jurassic boundary interval in the Slovenian Basin (eastern Southern Alps)

Early Jurassic foraminiferal assemblages in platform carbonates of Mt. Krim, central Slovenia

New Upper Triassic Conodont Biozonation of the Tethyan Realm

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