The Latemar: A Middle Triassic polygonal fault-block platform controlled by synsedimentary tectonics

Preto, Nereo; Franceschi, Michel; Gattolin, Giovanni; Massironi, Matteo; Riva, A.; Gramigna, Pierparide; Bertoldi, Luca; Nardon, S.

doi:10.1016/j.sedgeo.2010.10.010

Cited by 40 publications

(41 citation statements)

References 45 publications

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“…Faults, as a major form of rifting movements, control the architecture and depositional sequences of fault-block carbonate platform (Bosence et al 1998;Preto et al 2011), and impact depositional environment and facies distributions of hangingwall and footwall (Wilson 1999). The platform boundary fault affects the type of slope sediments and platform geomorphology (Yilmaz 2006;Lü et al 2013;Quiquerez et al 2013).…”

Section: Discussionmentioning

confidence: 99%

Type and evolution of carbonate platforms in Jixian Period Mesoproterozoic: southwestern margin of Ordos Basin

Chen

Xiao

et al. 2015

J Petrol Explor Prod Technol

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The Ordos block experienced extension in the Mesoproterozoic, during which the Longshan-Kuanping and Haiyuan rifts developed on its southwest margin. The Jixian Group (1.6-1.4 Ga) is mainly exposed on the rimmed and ramp-type platforms at the Qishan County, southwest of the Ordos block. The deposition associated with the rimmed platform margin consists of platform facies, platform edge facies, and slope facies, which are characterized by small tidal creeks, mud cracks and scour troughs, rockfalls, respectively. The ramp-type platform is dominated by platform edge facies, shelf facies and slope facies and featured by intraclastic dolostones, tempestites and debris flow sediments respectively. The syndepositional normal faults were well developed at the early stage of the rifting. Fault-related cracks and folds present in the adjacent strata. The uplift of the footwall rimmed the platform. The drag structures determine the local sedimentary environment. In the final stage of the rifting, the fault movement stopped. The surrounding rocks were undeformed. The slope became less steep, resulting in the formation of ramp-type platform. The study area in the Jixian period, Mesoproterozoic is located at a palaeocontinental margin, which has already shown good petroleum prospectivity. A clear study on the type of carbonate platforms and the evolution of the platforms can help reduce exploration risks by improve the understanding of the presence of the source rocks.

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Section: Discussionmentioning

confidence: 99%

Type and evolution of carbonate platforms in Jixian Period Mesoproterozoic: southwestern margin of Ordos Basin

Chen

Xiao

et al. 2015

J Petrol Explor Prod Technol

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“…The North Dobrogean Tubiphytes-dominated framework, with a high volume (30-50%) of penecontemporaneous and early-diagenetic cements and a considerable amount of automicrite, corresponds well to other Tubiphytes-dominated reefs, known from the Late Palaeozoic to Mesozoic: the Permian reefs of the Urals in Russia (Chuvashov 1983;Antoshkina 1998), the Permian Capitan Reef in the United States (Tinker 1998;Saller et al 1999;Weidlich 2002), and the Middle Triassic (Anisian-Ladinian) reefs, such as the Great Bank of Guizhou, in south China (Enos et al 1997(Enos et al , 2006Lehrmann 1999;Payne et al 2006Payne et al , 2011Lehrmann et al 2007), the Camorelli Bank and Concarena platform in the Italian Lombardic Alps (Gaetani and Gorza 1989;Berra et al 2005;Seeling et al 2005), the Latemar platform in the Italian Dolomites (Harris 1993(Harris , 1994Emmerich et al 2005;Marangon et al 2011;Preto et al 2011), and the Aggtelek reef in Hungary (Velledits et al 2011(Velledits et al , 2012. Microbial boundstones, as Tubiphytes-dominated facies, are also the main constituents of the Carboniferous upper slopes in the Cantabrian Mountains in northern Spain (Della Porta et al 2003;2004;Kenter et al 2005;Bahamonde et al 2007).…”

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

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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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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“…Exceptionally high subsidence rates strongly conditioned the deposition of a very thick shallow water carbonate succession (. 600 m) characterized by aggrading geometries (Figure 3 this article; Figure 9 of Preto et al, 2011). The geodynamic context responsible for such an important creation of accommodation space is unclear, although it might be related to the strong late Anisian to early Ladinian extension, widespread and documented in the Dolomites and Eastern Southern Alps.…”

Section: Stratigraphy and Geodynamicsmentioning

confidence: 99%

“…lithoclasts. This unit, deposited at the foot of fault scarps carved in the Contrin Formation (see Preto et al, 2011 for further details), overlies the Contrin Fm. and underlies the Latemar platform.…”

Section: Depositional Architecturementioning

confidence: 99%

“…In an early stage of growth, a significant portion of the slope is composed of microbial boundstones, most abundant in its upper and median portion (down to 200-250 m water depth), with prevailing clotted peloidal structure and abundant early marine cements (Figures 6, 7e;Blendinger, 1994;Preto et al, 2011; slope growth phase I sensu Marangon et al, 2011). Microbial boundstones may, however, occasionally occur as deep as at the base of the slope (see main map).…”

Section: Slope Unitsmentioning

confidence: 99%

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Geological map of the Middle Triassic Latemar platform (Western Dolomites, Northern Italy)

et al. 2013

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The Latemar is a Middle Triassic isolated carbonate buildup with a diameter of approximately 3 km, that crops out in the western Dolomites, northern Italy. The platform is an important case study and potential analogue for carbonate hydrocarbon reservoirs. Detailed field mapping of the platform has been carried out on a high-resolution topographic base extracted from airborne LIDAR to produce a geological map at 1:5000 scale. Remote sensing was used for the recognition of structural features and then validated in the field. In addition, high-resolution digital photographs were used to interpret the geology of inaccessible rock walls. This work represents a up-to-date detailed geologic map of the Middle Triassic Latemar platform that enhances its internal units subdivision and highlights its complex shape, characterized by gulfs and internal basins and strongly controlled by synsedimentary tectonics.

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The Latemar: A Middle Triassic polygonal fault-block platform controlled by synsedimentary tectonics

Cited by 40 publications

References 45 publications

Type and evolution of carbonate platforms in Jixian Period Mesoproterozoic: southwestern margin of Ordos Basin

Type and evolution of carbonate platforms in Jixian Period Mesoproterozoic: southwestern margin of Ordos Basin

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

Geological map of the Middle Triassic Latemar platform (Western Dolomites, Northern Italy)

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