Anisian (middle triassic) buildups of the Northern Dolomites (Italy): The recovery of reef communities after the permian/triassic crisis

Senowbari‐Daryan, Baba; Zühlke, Rainer; Bechstädt, Thilo; Flügel, Erik

doi:10.1007/bf02539736

Cited by 107 publications

(55 citation statements)

References 30 publications

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“…The Anisian represents the time of recovery of biogenic carbonate production after the crisis at the Permian/Triassic boundary (Gaetani et al 1981;Senowbari-Daryan et al 1993;Berra et al 2005). In this context, the lower Middle Anisian section in Mahmudia Quarry is of particular importance in revealing the recovery of carbonate production during the Early Mesozoic.…”

Section: Comparison With Other Tubiphytes-buildups Known In the Geolomentioning

confidence: 99%

“…This is recorded after the end-Palaeozoic or Early-Middle Triassic extinctions (Della Porta et al 2004), which deeply affected the carbonate production in the following time intervals. The Early Triassic 'reef gap' lasted more than 5 Ma (Payne et al 2006), before the reef communities re-diversified during the Middle Triassic (Flügel and Stanley 1984;Stanley 1988;Senowbari-Daryan et al 1993;Flügel 1994Flügel , 2002. During this time, the intense hothouse climate that caused the extinction persisted and the equator to pole temperature gradient was very low (Preto et al 2010).…”

Section: Introductionmentioning

confidence: 99%

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An early Middle Anisian (Middle Triassic) Tubiphytes and cement crusts-dominated reef from North Dobrogea (Romania): facies, depositional environment and diagenesis

Popa¹,

Panaiotu²,

Grădinaru³

2014

Acta Geologica Polonica

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ABSTRACT:Popa, L., Panaiotu, C.E. and Grădinaru, E. 2014. An early Middle Anisian (Middle Triassic) Tubiphytes and cement crusts-dominated reef from North Dobrogea (Romania): facies, depositional environment and diagenesis. Acta Geologica Polonica, 64 (2), 189-206. Warszawa.A well-developed Triassic carbonate platform is exposed in the eastern part of the Tulcea Unit, in the Cimmerian North Dobrogean Orogen, southeastern Romania. Facies analysis of the 200 m thick succession of lower Middle Anisian limestones exposed in a large limestone quarry south of the village of Mahmudia suggests a transition from upper slope towards toe-of-slope carbonate facies, reflecting sea-level fluctuations and tectonic tilting. The slope is dominated by in situ microbialites in the upper portion, consisting of reefal boundstone facies, and by molluscan coquina and cement boundstones. A key role is played by the cosmopolitan micro-encruster Tubiphytes, which became common in the aftermath of the mass extinction at the Permian/Triassic boundary, and by autochthonous micrite and synsedimentary marine cement. The absence of metazoan reef builders, such as sponges and corals, reflects the fact that microbes were the first organisms to recover after the Permian/Triassic crisis under unusual marine conditions and that their main role in reef formation was sediment stabilization along the upper slopes. The lower slope is mostly detrital, being dominated by platform-derived bioclastic rudstones and crinoidal floatstones, which are interbedded with basinal carbonate hemipelagics. The toe-of-slope is composed of pelagic wackestones framed by thin tongues of intraclast breccia. All these observations are in agreement with the slopeshedding model described for the Pennsylvanian microbial margin in Asturias (northern Spain) and the AnisianLadinian flat-topped, steep-rimmed Latemar platform (Dolomites, Italy).As most of the Anisian reefs were described from western and eastern Tethys (Southern Alps, Hungary, China), the occurrence of the early Middle Anisian Tubiphytes-reef from North Dobrogea (Romania) contributes to resolving the puzzle of the geographic distribution of reef recovery in the Middle Triassic.

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Section: Comparison With Other Tubiphytes-buildups Known In the Geolomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An early Middle Anisian (Middle Triassic) Tubiphytes and cement crusts-dominated reef from North Dobrogea (Romania): facies, depositional environment and diagenesis

Popa¹,

Panaiotu²,

Grădinaru³

2014

Acta Geologica Polonica

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“…The Induan biotic recovery in the Southern Alps, however, does not show the increasing of the body fossil biodiversity and neither the re-appearance of marine stenotopic organisms (e.g., crinoids or rhynchonelliform brachiopods). This recovery phase thus records a mitigation of the extinction aftermath on the marine ecosystems, not their cessation, which in the Southern Alps occurred in several steps until the complete recovery in the late Anisian with the re-appearance of the rhynchonelliform brachiopods and reef communities (e.g., Senowbari-Daryan et al, 1993;Posenato, 2008b). …”

Section: Shell Sizementioning

confidence: 99%

Adaptive strategies and environmental significance of lingulid brachiopods across the late Permian extinction

Posenato

Holmer

Prinoth³

2014

Palaeogeography, Palaeoclimatology, Palaeoecology

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The main adaptive strategies of Lingularia yini, in comparison with the Permian species, include: i) shell miniaturization; ii) increasing of the lophophoral cavity surface (respiratory surface); iii) increasing of shell width/length ratio. These modifications are interpreted as adaptations towards warming and hypoxia, two main killing mechanisms of the marine biota.The recovery species Lingularia borealis maintains a large lophophoral cavity, indicating an adaptation towards predominant low oxygenated bottom marine waters.The appearance and the great abundance of Lingularia yini in the Mazzin Member (early Induan) can represent a proxy of dysaerobic and acidic marine conditions, which determined the appearance of the second phase of the Lilliput biota, characterized by the definitive disappearance of the rhynchonelliform brachiopods and calcareous algae in the Southern Alps.

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“…Carbonate platforms as biologically constructed shallow marine buildups disappeared at the end-Permian biotic catastrophe and slowly began to develop again in the Middle Triassic, first in the early Anisian in the eastern (Southwest China: Payne et al 2006), then in the middle Anisian, in the western Tethys (Senowbari-Daryan et al 1993;Russo 2005;Velledits et al 2011). The carbonate platforms, as novel elements of the Mesozoic marine environment after the "reef gap" (Senowbari-Daryan et al Central European Geology 57, 2014 Ammonoid diversification in the Middle Triassic 337 Fig.…”

Section: Anisian Carbonate Platformsmentioning

confidence: 99%

Ammonoid diversification in the Middle Triassic: Examples from the Tethys (Eastern Lombardy, Balaton Highland) and the Pacific (Nevada)

Vörös¹

2014

Central European Geology

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The diversity dynamics of the Anisian ammonoids is analyzed in terms of generic richness and turnover rates in one North American (Nevada) and two western Tethyan (Eastern Lombardy, Balaton Highland) regions. Two pulses of diversification are outlined: one in the middle Anisian (Pelsonian) and another near the end of the late Anisian (late Illyrian). The Pelsonian global diversification is interpreted as an effect of global sea-level rise. In the early late Anisian the ammonoid generic richness definitely decreased both in the western Tethys and in Nevada. The latest Anisian peak of ammonoid diversity was low in Nevada, which is explained by the uniform local sedimentary environment and the absence of major global changes. In the western Tethys the late Illyrian diversity peak was very prominent: ammonoid generic richness, turnover and proportion of originations were very high. This explosive peak is interpreted in terms of major changes of two regional environmental factors: coeval volcanic activity and the control of nearby carbonate platforms. The late Illyrian volcanic ash falls provoked a dramatic increase of ammonoid generic richness by fertilization, i.e. supplying nutrients and iron, thus increasing primary productivity in the ocean. Carbonate platform margins offered diverse habitats with new, empty niches; the microbial mats supplied suspended organic matter for the higher trophic levels and eventually the ammonoids. In the western Tethyan regions platform growth re-appeared after the end-Permian crisis, and significantly increased in the late Illyrian. This was closely followed by the remarkable increase of ammonoid generic richness. Many of the genera which originated during the late Anisian seem to be ecologically connected to the platform or peri-platform environments. It is suggested that this explosive diversity peak is a manifestation of the co-evolution of the Tethyan carbonate platforms and the ammonoids.

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Anisian (middle triassic) buildups of the Northern Dolomites (Italy): The recovery of reef communities after the permian/triassic crisis

Cited by 107 publications

References 30 publications

An early Middle Anisian (Middle Triassic) Tubiphytes and cement crusts-dominated reef from North Dobrogea (Romania): facies, depositional environment and diagenesis

An early Middle Anisian (Middle Triassic) Tubiphytes and cement crusts-dominated reef from North Dobrogea (Romania): facies, depositional environment and diagenesis

Adaptive strategies and environmental significance of lingulid brachiopods across the late Permian extinction

Ammonoid diversification in the Middle Triassic: Examples from the Tethys (Eastern Lombardy, Balaton Highland) and the Pacific (Nevada)

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