A Triassic homoclinal ramp from the Western Tethyan realm, Western Balkanides, Bulgaria: Integrated insight with special emphasis on the Anisian outer to inner ramp facies transition

Chatalov, Athanas

doi:10.1016/j.palaeo.2013.04.028

Cited by 20 publications

(27 citation statements)

References 76 publications

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“…Subsidence rates during the Early Triassic are estimated to have been slow ( ca 18 m per m.a.) (Liu & Einsele, ); the low, uniform subsidence rates of passive continental margins favour the formation of homoclinal carbonate ramps (Chatalov, , ). This is because passive continental margins provide a flat base for carbonate accumulation and hinders detrital input (Chatalov, ).…”

Section: Discussionmentioning

confidence: 99%

Facies and evolution of the carbonate factory during the Permian–Triassic crisis in South Tibet, China

Song

Woods

et al. 2019

Sedimentology

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The nature of Phanerozoic carbonate factories is strongly controlled by the composition of carbonate-producing faunas. During the Permian-Triassic mass extinction interval there was a major change in tropical shallow platform facies: Upper Permian bioclastic limestones are characterized by benthic communities with significant richness, for example, calcareous algae, fusulinids, brachiopods, corals, molluscs and sponges, while lowermost Triassic carbonates shift to dolomicrite-dominated and bacteria-dominated microbialites in the immediate aftermath of the Permian-Triassic mass extinction. However, the spatial-temporal pattern of carbonates distribution in high latitude regions in response to the Permian-Triassic mass extinction has received little attention. Facies and evolutionary patterns of a carbonate factory from the northern margin of peri-Gondwana (palaeolatitude ca 40°S) are presented here based on four Permian-Triassic boundary sections that span proximal, inner to distal, and outer ramp settings from South Tibet. The results show that a cool-water bryozoan-dominated and echinodermdominated carbonate ramp developed in the Late Permian in South Tibet. This was replaced abruptly, immediately after the Permian-Triassic mass extinction, by a benthic automicrite factory with minor amounts of calcifying metazoans developed in an inner/middle ramp setting, accompanied by transient subaerial exposure. Subsequently, an extensive homoclinal carbonate ramp developed in South Tibet in the Early Triassic, which mainly consists of homogenous dolomitic lime mudstone/wackestone that lacks evidence of metazoan frame-builders. The sudden transition from a cool-water, heterozoan dominated carbonate ramp to a warm-water, metazoan-free, homoclinal carbonate ramp following the Permian-Triassic mass extinction was the result of the combination of the loss of metazoan reef/mound builders, rapid sea-level changes across Permian-Triassic mass extinction and profound global warming during the Early Triassic.

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Section: Discussionmentioning

confidence: 99%

Facies and evolution of the carbonate factory during the Permian–Triassic crisis in South Tibet, China

Song

Woods

et al. 2019

Sedimentology

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“…Marine deposition started during the late Early Triassic epoch when a carbonate ramp was progressively formed having gentle inclination to the east/southeast (Čatalov, 1988). The ramp system evolved in the northwestern shelf area of the Tethys Ocean on the passive continental margin of Eurasia (see Chatalov, 2013, and cited references), and palaeomagnetic data obtained by Muttoni et al . (2000) indicate palaeolatitude position of 21–24° N (Fig.…”

Section: Brief Synopsis Of the Triassic Ramp Carbonates From The Westmentioning

confidence: 99%

“…The whole succession corresponds to a symmetrical second-order transgressive-regressive (T-R) stratigraphic cycle ( sensu Duval, Cramez & Vail, 1998), i.e. defined on the basis of long-term displacements of the shoreline and controlled by a second-order eustatic cycle (Chatalov, 2013). Marine deposition started during the late Early Triassic epoch when a carbonate ramp was progressively formed having gentle inclination to the east/southeast (Čatalov, 1988).…”

Section: Brief Synopsis Of the Triassic Ramp Carbonates From The Westmentioning

confidence: 99%

“…Diverse subtidal, intertidal and supratidal carbonate facies were generated without significant terrigenous input in several depositional environments under different hydrodynamic regimes (Fig. 3): tidal flats, inner ramp lagoons and shoals, storm-dominated and fair-weather mid-ramp areas and storm-influenced outer ramp (Assereto & Chatalov, 1983; Tronkov, 1983; Vaptsarova, Chemberski & Chatalov, 1984; Chatalov, 2000 b , 2002, 2010, 2013; Chatalov & Vangelov, 2001). The sedimentation produced a nearly 500 m thick succession (Chatalov, 2013), lithostratigraphically referred to as Iskar Carbonate Group (Tronkov, 1981), which consists of limestones and dolostones (Fig.…”

Section: Brief Synopsis Of the Triassic Ramp Carbonates From The Westmentioning

confidence: 99%

“…3): tidal flats, inner ramp lagoons and shoals, storm-dominated and fair-weather mid-ramp areas and storm-influenced outer ramp (Assereto & Chatalov, 1983; Tronkov, 1983; Vaptsarova, Chemberski & Chatalov, 1984; Chatalov, 2000 b , 2002, 2010, 2013; Chatalov & Vangelov, 2001). The sedimentation produced a nearly 500 m thick succession (Chatalov, 2013), lithostratigraphically referred to as Iskar Carbonate Group (Tronkov, 1981), which consists of limestones and dolostones (Fig. 4) plus a minor amount of siliciclastic rocks in the lowermost part (Chatalov, Stefanov & Vetseva, 2015).…”

Section: Brief Synopsis Of the Triassic Ramp Carbonates From The Westmentioning

confidence: 99%

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Global, regional and local controls on the development of a Triassic carbonate ramp system, Western Balkanides, Bulgaria

Chatalov

2016

Geol. Mag.

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The Early to Late Triassic development of a carbonate ramp system in the subtropical belt of the NW Tethys was controlled by the interplay of several global and regional factors: geotectonic setting (slow continuous subsidence on a passive continental margin), antecedent topography (low-gradient relief inherited from preceding depositional regime), climate and oceanography (warm and dry climatic conditions, storm influence), relative sea-level changes (Olenekian to Anisian eustatic rise, middle Anisian to early Carnian sea-level fall), lack of frame-builders (favouring the maintenance of ramp morphology), and carbonate production (abundant formation of lime mud, non-skeletal grains and marine cements, development of diverse biota controlled by biological evolution and environmental conditions). Elevated palaeorelief affected the ramp initialization on a local scale, while autogenic processes largely controlled the formation of peritidal cyclicity during the early stage of ramp retrogradation. Probably fault-driven differential subsidence caused a local distal steepening of the ramp profile in middle–late Anisian time. The generally favourable conditions promoted long-term maintenance of homoclinal ramp morphology and accumulation of carbonate sediments having great maximum thickness (~500 m). Shutdown of the carbonate factory and demise of the ramp system in the early Carnian resulted from relative sea-level fall and subsequent emergence. After a period of subaerial exposure with minor karstification, the deposition of continental quartz arenites suggests the possible effect of the Carnian Pluvial Episode.

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An ancient analogue of carbonate beach complex: the Upper Triassic limestones of Tran Formation, southwestern Bulgaria

Chatalov

2021

Int J Earth Sci (Geol Rundsch)

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A Triassic homoclinal ramp from the Western Tethyan realm, Western Balkanides, Bulgaria: Integrated insight with special emphasis on the Anisian outer to inner ramp facies transition

Cited by 20 publications

References 76 publications

Facies and evolution of the carbonate factory during the Permian–Triassic crisis in South Tibet, China

Facies and evolution of the carbonate factory during the Permian–Triassic crisis in South Tibet, China

Global, regional and local controls on the development of a Triassic carbonate ramp system, Western Balkanides, Bulgaria

An ancient analogue of carbonate beach complex: the Upper Triassic limestones of Tran Formation, southwestern Bulgaria

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