Biostratigraphy and facies description of Middle Triassic rift-related volcano-sedimentary successions at the junction of the Southern Alps and the Dinarides (NW Croatia)

Kukoč, Duje; Smirčić, Duje; Grgasović, Tonči; Belak, Mirko; Japundžić, Dražen; Kolar‐Jurkovšek, Tea; Šegvić, Branimir; Badurina, Luka; Vukovski, Matija; Slovenec, Damir

doi:10.1007/s00531-023-02301-w

Cited by 9 publications

(6 citation statements)

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“…The largest part of the mountain is built of several hundred meters thick Middle Triassic deposits, predominantly shallow-marine dolomites and limestones (Šimunić et al, 1982). Pelagic successions consisting of Anisian to Ladinian pelagic limestone and radiolarian chert intercalated with volcanic and volcaniclastic lithologies ranging from basic to acidic are also present (Goričan et al, 2005;Slovenec et al, 2020Slovenec et al, , 2023Kukoč et al, 2023;Smirčić et al, 2024). These pelagic successions are several tens of meters thick, generally tectonically disturbed and their contacts with the underlying and overlying formations are rarely exposed.…”

Section: Lithostratigraphic Characteristicsmentioning

confidence: 99%

“…These pelagic successions are several tens of meters thick, generally tectonically disturbed and their contacts with the underlying and overlying formations are rarely exposed. Middle Triassic successions re ect a period of intense tectonic activity related to the opening of the Neotethys Ocean and the formation of a horst-and-graben depositional environments as a result of extension (Goričan et al, 2005;Kukoč et al, 2023). Deep-marine basins formed during this period were relatively short-lived and carbonate platform sedimentation was reestablished in the late Ladinian (Goričan et al, 2005).…”

Section: Lithostratigraphic Characteristicsmentioning

confidence: 99%

“…were relatively scarce (Babić et al, 2002;Goričan et al 2005;Lužar-Oberiter et al, 2009, until a series of recently published studies released by the GOST project (https://projectgost.wordpress.com). These studies provide new data set on stratigraphy (Slovenec et al 2020; Kukoč et al, 2023Kukoč et al, , 2024, petrology Slovenec et al, 2023;Šegvić et al, 2022) and lithostratigraphy of the Adriatic passive margin successions (Vukovski et al, 2023) tectonically assembled into the structural architecture of this mountain. As a supplement to published studies of the GOST project, this paper aims to present new and more detailed data on spatial arrangement, kinematics and age of deformational structures in Mesozoic and Cenozoic rocks of Ivanščica Mt.…”

Section: Introductionmentioning

confidence: 98%

“…), are interpreted as deposited in a relatively deep depocenters arranged in a form of half-grabens controlled by steep normal faults(Goričan et al, 2005;Slovenec et al, 2020Slovenec et al, , 2023Kukoč et al, 2023). On Ivanščica Mt., the oldest pelagic deposits are Illyrian radiolarian cherts(Goričan et al, 2005;Slovenec et al, 2020;Kukoč et al, 2023), while on nearby Kuna gora Mt. ammonites dating of pelagic limestones indicate their Pelsonian age(Kukoč et al, 2023).…”

mentioning

confidence: 99%

“…On Ivanščica Mt., the oldest pelagic deposits are Illyrian radiolarian cherts(Goričan et al, 2005;Slovenec et al, 2020;Kukoč et al, 2023), while on nearby Kuna gora Mt. ammonites dating of pelagic limestones indicate their Pelsonian age(Kukoč et al, 2023). Thus, this oldest deformational event (D1) is assumed as extensional and related with the opening of the Neotethys Ocean during Middle Triassic times.…”

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confidence: 99%

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Unravelling the Tectonic Evolution of the Dinarides – Alps – Pannonian Basin Transition Zone: Insights from Structural Analysis and Low-Temperature Thermochronology from Ivanščica Mt., NW Croatia

Vukovski,

Špelić,

Kukoč

et al. 2024

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A comprehensive study, including geological mapping, structural and thermochronological analysis, has been carried out on Ivanščica Mountain (NW Croatia), with the aim to contribute in reconstruction of the tectonic history of the Dinarides, Southern/Eastern Alps and Pannonian Basin transitional zone. Implementation of structural and thermochronological methods enabled a subdivision of Ivanščica Mt. into three structural domains (from bottom to top): Ivanščica Parautochton, Ivanščica Imbricates and Oligo-Neogene sedimentary cover. In addition, a sequence of deformational events in tectonic history of this transitional zone is proposed, comprising three extensional and four contractional events starting from Middle Triassic until present times. Oldest deformational events indicating Middle Triassic (D1) and Early Jurassic (D2) extensional phases were recognised only in volcano-sedimentary record. The oldest contractional event (D3) is related to obduction of the Neotethyan ophiolitic mélange over Upper Triassic to Lower Cretaceous succession of the eastern margin of the Adriatic microplate, which resulted in thermal alteration of the Ivanščica Imbricates structural domain in Berriasian - Valanginian times (~ 140 Ma). This event was soon followed by another contractional event (D4), which resulted in thrusting and imbrication of the Adriatic passive margin successions together with tectonically emplaced ophiolitic mélange, thermal alteration of the footwall successions, fast exhumation and erosion. Apatite fission track data together with syn-tectonic deposits indicate Hauterivian to Albian age of this event (~ 133–100 Ma). These Mesozoic structures were rotated in post-Oligocene times and brought from initially typically Dinaridic SE striking and SW verging structures to recent SW striking and NW verging structures. Following extensional event (D5) manifested in the formation of SE striking and mostly NE dipping normal listric faults, and ENE striking dextral faults accommodating top-NE extension in the Pannonian Basin. Deformations were coupled with hanging wall sedimentation of Ottnangian to middle Badenian (~ 18–14 Ma) syn-rift deposit as observed from the reflection seismic and well data. Short lasting contraction (D6) was registered in the late Sarmatian (~ 12 Ma). The youngest documented deformational event (D7) resulted in reactivation of ENE striking dextral faults, formation of SE striking dextral faults as well as the formation of E to NE trending folds and reverse faults. This event corresponds to Late Pannonian (~ 6 Ma) to recent NNW-SSE contraction driven by the indentation and counterclockwise rotation of Adriatic microplate. Recognized tectonic events and their timings indicate that Ivanščica was mainly affected by deformational phases related to the Mesozoic evolution of the Neotethys Ocean as well as Cenozoic opening and inversion of the Pannonian Basin. Mesozoic tectono-sedimentary evolution of Ivanščica Mountain exhibits clear Dinaridic affiliation, more precisely, that of the Pre-Karst zone of the Dinarides.

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Section: Lithostratigraphic Characteristicsmentioning

confidence: 99%