Accommodation/sedimentation development and massive early marine cementation: Latemar vs. Concarena (Middle/Upper Triassic, Southern Alps)

Seeling, Michael; Emmerich, Axel; Bechstädt, Thilo; Zühlke, Rainer

doi:10.1016/j.sedgeo.2004.09.004

Cited by 30 publications

(33 citation statements)

References 27 publications

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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 Geolosupporting

confidence: 53%

“…Some carbonate platforms show this feature determined by the following factors: accommodation space, slow rates, low carbonate production, margin topography and effective fluid flow (Seeling et al 2005). Brown fibrous cement, often appearing as thick isopachous crust, volumetrically dominates the coarser facies and as it does not display any evidence of dissolution, is interpreted as penecontemporaneous cement deposited when the reef was in active contact with seawater (Payne et al 2006).…”

Section: Diagenetic Historymentioning

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 Geolosupporting

confidence: 53%

Section: Diagenetic Historymentioning

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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“…As discussed in the literature (Reijmer et al, 1991;Blendinger, 1994;Reijmer, 1998;Kenter et al, 2002Kenter et al, , 2005della Porta et al, 2004;Seeling et al, 2005), the main carbonate factory is located on the upper slope and within water depths between 0 and 300 m. This specific, slope-productivity-driven growth characteristic is especially true for prograding carbonate platforms (Bosellini, 1989;Boni et al, 1994;Seeling et al, 2005). Similarly, Kenter et al (2005) and della Porta et al (2004) attribute the progradation of Carboniferous carbonate platforms in the Cantabrian Mountains of Spain mainly to an increased productivity of the cement-rich boundstone belt.…”

Section: Sensitivity Analysismentioning

confidence: 91%

“…Palaeotemperature values in column 9 are calculated from the measured thermal maturity data (% VR r values in column 8) after the equation of Barker & Pawlewicz (1986). The last columns (11, central age; 12, mean track length) refer to the apatite fission-track analysis carried out in Emmerich et al (2005). by microscopic analysis of percentages of light reflected from polished organic particles and calibrated against isotropic standards.…”

Section: Vitrinite Reflectance and Apatite Fission-tracksmentioning

confidence: 99%

“…19a). Minor back and forth adjustments of the margin during the first stage of platform development are attributed to difficulties of the carbonate system in establishing slope and keeping up with the rapid accommodation increase during the Reitzi biozone (sediment input in time is nearly outpaced by accommodation change, i.e., A → S ; sensu Seeling et al, 2005). Nevertheless, the aggradation trend is clearly identifiable.…”

Section: Best-fit Modelmentioning

confidence: 99%

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Numerical Simulation of the Syn‐ to Post‐Depositional History of a Prograding Carbonate Platform: The Rosengarten, Middle Triassic, Dolomites, Italy

Emmerich

Tscherny

Bechstädt

et al. 2008

Analogue and Numerical Modelling of Sedimentary Systems: From Understanding to Prediction

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A combination of thermal history, numerical basin-reverse and sequence-stratigraphic forward modelling is applied to the Mesozoic outcrop analogue of the Rosengarten carbonate platform area in the Dolomites of northern Italy. This integrated multidisciplinary approach of numerical simulation quantifies the thermal, subsidence, geometrical and subsequent facies evolution of the area. Calibration data during modelling were vitrinite reflectance (VR) and apatite fission-track (FT) analyses as well as detailed outcrop studies. Vitrinite reflectance values in strata underlying the carbonate platform vary between 0.5 and 0.8% VR r ; apatites from these formations reveal cooling ages of around 165.6 Ma and track lengths of approximately 9.8 µm. This low thermal maturity combined with the FT data in apatites indicates a relatively cool (<110 • C), protracted (between 250 and 30 Ma) and shallow burial (thickness of eroded strata overlying present-day topography is <1100 m), as well as a fast exhumation from the Middle Miocene onward. Maximum temperatures are reached during the Middle/Late Triassic, when the basal heat flow was elevated owing to regional volcanic and hydrothermal activity. Local anomalies in vitrinite reflectance of up to 1.1% VR r in the immediate surroundings of the Predazzo/Monzoni volcanic centre show that its thermal influence decreased rapidly with increasing distance. The geometrical evolution of the Middle Triassic (Anisian/Ladinian) Rosengarten platform is twofold: the first stage reveals aggradation, the second progradation of the platform margin. Basin-reverse modelling results indicate that these two intervals originate from a temporal change in tectonic subsidence. Spatial variations in flexural and tectonic subsidence along the 6 km transect are insignificant due to the rigidity of the basement (up to 2500 m of Late Permian ignimbrites). During the first stage of platform evolution, high pulse-like total subsidence rates of up to 820 m Myr −1 led to aggradation, whereas the subsequent drop to 100 m Myr −1 initiated platform progradation. The short-spanned subsidence peak was linked to block movements in a strike-slip tectonic setting (Cima Bocche Anticline-Stava Line approximately 10 km southeast of the study area). Stratigraphic forward modelling quantifies the sediment volumes involved in the geometrical evolution of the platform. In order to replicate platform architecture, constant carbonate accumulation rates between 900 and 1000 m Myr −1 -increasing from periplatform environments to the slope -have to be assumed throughout the existence (approximately 5.8 Myr) of the Rosengarten. As the carbonate factory successfully keeps up with the modelled accommodation rates, it must have completely recovered from the Permian-Triassic biotic crisis during the onset of platform growth in latest Anisian times despite the low biotic diversity of the platform succession seen elsewhere in the Dolomites. Our forward modelling confirms that the main carbonate factory was situated on the slope at water dep...

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The reefal margin and slope of a Middle Triassic carbonate platform: the Latemar (Dolomites, Italy)

Emmerich

Zamparelli

Bechstädt

et al. 2005

Facies

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The Latemar is a mainly aggrading platform, but shows repeated backstepping during its entire development. The behaviour of the slope does not reflect accommodation changes and lateral consistencies of the lagoonal interior; the Latemar contemporaneously reveals different, even contrasting depositional characteristics. The slope of the late stage platform evolution corresponds at least partially to the "base-of-slope apron" model. Controlling factors on slope evolution are of tectonic (proximity of the Stava Line) and autocyclic (repeated oversteepening) nature. Other factors are insignificant and/or overprinted. The reef-facies at Latemar reveals a complex facies pattern; it varies along and across the margin and is rich in encrusting sponges, corals, biogenic crusts and "Microproblematica". Some biota or fossil assemblages-e.g. foraminifers (Abriolina mediterranea, Turriglomina scandonei) or "Tubiphytes" multisiphonatus thrombolites-have not been described in the Dolomites before. Biostratigraphic evidence from the uppermost reef-facies confirms a mainly Anisian age of the outcropping platform interior.

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Accommodation/sedimentation development and massive early marine cementation: Latemar vs. Concarena (Middle/Upper Triassic, Southern Alps)

Cited by 30 publications

References 27 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

Numerical Simulation of the Syn‐ to Post‐Depositional History of a Prograding Carbonate Platform: The Rosengarten, Middle Triassic, Dolomites, Italy

The reefal margin and slope of a Middle Triassic carbonate platform: the Latemar (Dolomites, Italy)

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