Early-Middle Jurassic stepwise deepening in the transitional facies belt between the Adriatic Carbonate Platform Basement and Neo-Tethys open shelf in northeastern Montenegro evidenced by new ammonoid data from the early Late Pliensbachian (Lavinianum Zone).

Martin Djakovic, Hans-Jürgen Gawlick, Milan Sudar

Publikation: Beitrag in FachzeitschriftArtikelTransferBegutachtung

Abstract

New ammonoid data prove an early Late Pliensbachian deepening event above the ?Late Hettangian-Sinemurian shallow-subtidal gray-reddish micro-oncoidal-foraminifera grainstone facies and the ?early Pliensbachian deeper-marine micro-oncoidal-crinoidal-ammonoid wacke- to packstone facies. Based on the presence of Fuciniceras lavinianum (Fucini), Lytoceras ovimontanum Geyer and Arieticeratinae gen. indet. from a hardground above the deeper-water micro-oncoidal limestones in the Mihajlovići section (northeastern Montenegro) a Late Pliensbachian to early Toarcian condensation horizon is proven. The Middle Toarcian ammonoid-bearing horizon also yielded species not known from previous studies: Calliphylloceras capitanii (cATuLLo), Harpoceras subplanatum (oPPeL) and Furloceras aff. chelussii (PAriScH & ViALe), also described in the present paper. These new data prove a stepwise deepening of the depositional area during the early and the Middle Jurassic reflected in detail in four sedimentary members: 1) ?Late Hettangian to Sine-murian/?earliest Pliensbachian open-marine shallow subtital micro-oncoidal limestones; 2) ?early to Late Pliensbachian open-marine condensed limestones with few micro-oncoids and more open-marine influence; 3) Toarcian open-marine condensed red limestones with hardgrounds; and 4) condensed red nodular Bositra Limestone. These four members are separated by hard-rounds representing stratigraphic gaps in deposition. The stepwise deepening during the early-Middle Jurassic follows the general trend of deposition as known in the whole Western Tethys realm above the Late Triassic Dachstein carbonate Platform.

OriginalspracheEnglisch
Seiten (von - bis)1-25
Seitenumfang25
FachzeitschriftGeološki anali balkanskoga poluostrva : Annales Geologiques de la Peninsule Balkanique
Jahrgang82.2021
Ausgabenummer1
DOIs
PublikationsstatusVeröffentlicht - 2021

Bibliographische Notiz

Funding Information:
This publication is a contribution to the iGcP-710 project “Western Tethys meets eastern Tethys” (HJG) and to the bilateral project “Jurassic mélanges and Mesozoic geodynamic history of the eastern Alps (Austria) and Di-narides (Montenegro): a comparison”, between the Geological Survey of Montenegro and the Montanuniversität Leoben, Department of Applied Geoscience and Geophysics, Austria, project no. Me 03/2019. The research of Milan Sudar was supported by the Serbian Academy of Sciences and Arts (Project F-22). The authors would like to thank iVAn DAniLoVić and BrAnko ViLoTiJeVić for their help in collecting the fossil material in the field. Finally, the authors would like to thank the reviewers PHiLiPPe FAuré and roMAn AuBrecHT for their usefull comments that helped improving the overall content of the manuscript. PHiLiPPe FAuré is especially thanked for giving advice on paleontological descriptions and systematic positions of collected ammonoid faunas.

Funding Information:
This publication is a contribution to the iGcP-710 project ?Western Tethys meets eastern Tethys? (HJG) and to the bilateral project ?Jurassic m?langes and Mesozoic geodynamic history of the eastern Alps (Austria) and Dinarides (Montenegro): a comparison?, between the Geological Survey of Montenegro and the Montanuniversit?t Leoben, Department of Applied Geoscience and Geophysics, Austria, project no. Me 03/2019. The research of Milan Sudar was supported by the Serbian Academy of Sciences and Arts (Project F-22). The authors would like to thank ivAn DAniLOVic and BrAnko ViLOTijevic for their help in collecting the fossil material in the field. Finally, the authors would like to thank the reviewers PHiLiPPe FAur? and roMAn AuBrecHT for their usefull comments that helped improving the overall content of the manuscript. PHiLiPPe FAur? is especially thanked for giving advice on paleontological descriptions and systematic positions of collected ammonoid faunas.

Publisher Copyright:
© 2021. All Rights Reserved.

Schlagwörter

  • Dinarides
  • Jurassic
  • Facies
  • Stratigraphy
  • Sedimentology
  • palaeogeograühy

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