Quantitative compositional analysis of a Triassic carbonate platform (Southern Alps, Italy)

Keim, Lorenz; Schlager, Wolfgang

doi:10.1016/s0037-0738(00)00163-9

Cited by 84 publications

(67 citation statements)

References 24 publications

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“…This is in accordance with studies on carbonate platforms from the Upper Carboniferous of the Asturian and Cantabrian mountains in Spain (Kenter et al, 2002(Kenter et al, , 2005della Porta et al, 2004) and confirmed at platforms where A > 0 and A /S → 0 (i.e., 'pathologically prograding ' Bosellini, 1989;Seeling et al, 2005). In the Dolomites, the studies of Keim & Schlager (2001) and highlight the importance of the automicrite factory on the slope for the growth of Middle Triassic carbonate platforms. The boundstone facies with laterally restricted and hence in situ accumulation, modelled in this project, is the driving mechanism behind (1) initial platform growth and (2) late-stage progradation.…”

Section: Carbonate Accumulation Ratessupporting

confidence: 89%

“…Previous studies have calculated/estimated compacted accumulation rates of 200-500 m Myr −1 (Dürrenstein: Schlager, 1981;Schlager et al, 1991), 600 m Myr −1 (Sella: Keim & Schlager, 2001) and 800 m Myr −1 (the Anisian part of the Latemar succession: Egenhoff et al, 1999) for Middle to Late Triassic carbonate platforms in the Dolomites. The rates simulated during this study are higher because they represent decompacted accumulation (up to 1000 m Myr −1 of accumulation in order to keep up with up to 820 m Myr −1 of subsidence).…”

Section: Carbonate Accumulation Ratesmentioning

confidence: 99%

“…However, assessing the evolution of carbonate platforms and their clinoforms has been mainly of a qualitative nature. Quantitative approaches of subsidence and carbonate accumulation of Middle Triassic platforms in the Dolomites have so far been scarce (Schlager, 1981;Doglioni & Goldhammer, 1988;Schlager et al, 1991;Maurer, 1999Maurer, , 2000Keim & Schlager, 2001) and lack unbiased numerical modelling techniques. The age of these platforms is usually constrained by coeval basinal sediments containing abundant biostratigraphic information (Buchenstein Fm; Brack & Rieber, 1993.…”

Section: Introductionmentioning

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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Section: Carbonate Accumulation Ratessupporting

confidence: 89%

Section: Carbonate Accumulation Ratesmentioning

confidence: 99%

Section: Introductionmentioning

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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“…North of Cernera this unit can be traced to the southern flank of Col Piombin with a vertical offset in the saddle south of this peak. Between M. Cernera and M. Verdal and east of the Loschiesuoi fault the platform core is replaced laterally by inclined and brecciated but mainly micritic slope deposits, similar in composition to the automicrite described by Keim & Schlager (2001). Beneath and northeast of the northern peak (2664) of Cernera such strata overlie the platform interior beds and clearly indicate a retrograding growth stage.…”

Section: Pre-platform Units and The Shape Of The Platform Basementioning

confidence: 82%

Geometry and chronology of growth and drowning of Middle Triassic carbonate platforms (Cernera and Bivera/Clapsavon) in the Southern Alps (northern Italy)

et al. 2007

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The depositional architecture and the geometric relationships between platform-slope deposits and basinal sediments along with paleontological evidence indicate the time interval of the younger Anisian Reitziites reitzi ammonoid zone to largely represent the main stage of platform aggradation at the Cernera and Bivera/Clapsavon carbonate platforms. Published and new U-Pb age data of zircons from volcaniclastic layers bracketing the stratigraphic interval of platform growth constrain the duration of platform evolution to a time span shorter than 1.8±0.7m.y., probably in the order of 0.5-1m.y., reflecting fast rates of vertical platform aggradation exceeding 500 m/m.y. In the range of growth potentials for shallow-water carbonate systems estimated in relation to the time span of observation, this high rate is in agreement with values for short intervals of 10 5 -10 6 yrs (e.g., Schlager 1999).After drowning, the platforms at Cernera and Bivera/Clapsavon were blanketed by thin pelagic carbonates. On the former platform flanks the draping sediments in places comprise red nodular pelagic limestones (Clapsavon Limestone) similar in facies to the Han Bulog Limestones occurring elsewhere in Middle Triassic successions of the Mediterranean Tethys. The drowning of vast areas of former carbonate platforms possibly triggered the onset of bottom-water circulation in adjacent basins as suggested by the abrupt transition from laminated to bioturbated pelagic nodular limestones in the Buchenstein Formation which occurred close to the time of initial platform submergence. During the Late Ladinian the topographic features of the drowned platforms were onlapped by rapidly deposited, predominantly clastic successions including coarse breccias and volcanic rocks sealing and preserving the peculiar stratigraphic setting. ZUSAMMENFASSUNGDie Architektur der retrogradierenden Karbonatplattformen der Cernera und des Bivera/Clapsavon Massifs weisen zusammen mit den geometrischen Beziehungen zwischen Plattformabhang-und Beckensedimenten und der Verbreitung von Ammonoideen auf ein kurzes Wachstumsintervall in der späten Reitziites reitzi Ammonitenzone (spätes Anisian) hin. Publizierte und neue hoch auflösende U-Pb-Alter von Zirkonen aus vulkanoklastischen Lagen grenzen dieses stratigraphische Intervall ein und ergeben für die Hauptphase des vertikalen Wachstums der Cernera-und der Bivera/Clapsavon-Plattform einen Zeitraum von weniger als 1.8±0.7 m.y., wahrscheinlich in der Grössen-ordnung von 0.5-1m.y.. In den als Funktion der Beobachtungsdauer geschätz-ten Wachstumspotentialen für Flachwasserkarbonatsysteme fällt die aus obiger Zeitspanne resultierende hohe Sedimentationsrate von 500 m/m.y. und mehr in den Bereich der Werte für die Bebachtungsdauer 10 5 -10 6 y (z.B. Schlager 1999).Nach dem Absinken der Cernera-und der Bivera/Clapsavon-Plattform wurden die markanten untermeerischen Erhebungen von geringmächtigen pelagischen Karbonaten bedeckt, Diese umfassen an den Plattformflanken unter anderem rote Knollenkalke (Clapsavon-Kalk) m...

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“…The Latemàr, albeit lacking a major frame-building metazoan community, nonetheless exhibits a stiff margin surrounded by steep slopes that are inclined to a deep basin: the margin is composed mainly of microorganisms such as Tubiphytes, calcimicrobes and automicrite, and it is reinforced by abundant amounts of early marine cements providing the necessary rigidity (Harris, 1993;Emmerich, 2001; see also Keim and Schlager, 2001). The Latemàr reef is further subdivided into a deeper water part with fragile, branching corals that were interpreted to have grown below normal wave base, and shallow-water reef areas dominated by encrusting wave-resistant organisms and delimiting the lagoonal interior (Harris, 1993;Emmerich, 2001).…”

Section: A Bcompetent Q Marginmentioning

confidence: 99%

Sea level changes versus hydrothermal diagenesis: Origin of Triassic carbonate platform cycles in the Dolomites, Italy: Discussion

Peterhänsel

Egenhoff

2005

Sedimentary Geology

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Quantitative compositional analysis of a Triassic carbonate platform (Southern Alps, Italy)

Cited by 84 publications

References 24 publications

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

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

Geometry and chronology of growth and drowning of Middle Triassic carbonate platforms (Cernera and Bivera/Clapsavon) in the Southern Alps (northern Italy)

Sea level changes versus hydrothermal diagenesis: Origin of Triassic carbonate platform cycles in the Dolomites, Italy: Discussion

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