The evolution of a calc-alkaline basic to silicic magma system: Geochemical and Rb-Sr, Sm-Nd, and isotopic evidence from the Late Hercynian Atesina-Cima d'Asta volcano-plutonic complex, northern Italy

Barth, Susanne; Oberli, Felix; Meier, Martin; Blattner, Peter; Bargossi, Giuseppe Maria; Battistini, G. Di

doi:10.1016/0016-7037(93)90323-o

Cited by 42 publications

(20 citation statements)

References 42 publications

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“…This elevated basal heat flow during the Late Triassic is associated with violent magmatic events in the vicinity of the Predazzo-Monzoni area. Many studies confirm this observation by either reset isotopic clocks from the Fassa Valley (Barth et al, 1993 or thermal modelling of sedimentary successions in the Southern Alps (Greber et al, 1997). However, our integrated 4D basin simulation contradicts the thermal history postulated by Zattin et al (2006) for the Dolomites.…”

Section: Burial and Thermal Historycontrasting

confidence: 48%

“…In contrast, Zattin et al (2006) suggested that heat flow remained at high values until the end of Jurassic rifting. We believe that the observations of Barth et al (1993) -a hydrothermal event in the Val di Fassa area resetting isotopic clocks at around 230-225 Ma -much better reflects the thermal evolution in our study area. The time interval between ∼100 Ma until today is characterized by a slowly decreasing basal heat flow down to values of 45 mW m −2 , as for example measured in wells in the Belluno basin (Sedico-1; Zattin et al, 2006).…”

Section: Time-temperature Historymentioning

confidence: 94%

“…This means that existing studies on the temporal evolution of the Upper Permian (basement: Barth & Mohr, 1994;Barth et al, 1993; sedimentary cover: Massari & Neri, 1997), Lower Triassic (Broglio Loriga et al, 1983) and Middle Triassic (Brack & Rieber, 1993;Brack et al, 1996;Maurer, 2000;Zühlke, 2000;Zühlke et al, 2003) in the study area were recalibrated to latest radiometric age measurements (Permian: Yugan et al, 1997;Permian-Triassic boundary: Mundil et al, 2001;Lower Triassic: Lehrmann et al, 2002;Middle Triassic: Mundil et al, 1996. The relative duration of the bio-, sequence-and lithostratigraphic timesteps of the existing studies was left unchanged.…”

Section: Stratigraphy and Timescalementioning

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: Burial and Thermal Historycontrasting

confidence: 48%

Section: Time-temperature Historymentioning

confidence: 94%

Section: Stratigraphy and Timescalementioning

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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show abstract

“…In analogy with other Variscan segments [40][41][42], the origin for intermediate-acid calc-alkaline volcanism in a transtensional -transpressive regime has been associated with partial melting in the lower continental crust previously thickened by the stacking of crustal nappes [23]. Mafic tholeiitic intrusions, dated to 305 -304 Ma in Corsica (U/ Pb, dissolution; [36]), with coeval to later emplacement than the main Sardo-Corsican batholith were ascribed to other sources than acid magmas [43].…”

Section: Sardiniamentioning

confidence: 99%

“…% of quartz, and 10 vol. % of garnet (Alm 56-60 Py [34][35][36][37][38][39][40][41][42] ). Mixing and fractional crystallization (MFC) were modelled in a closed system under isobaric, isenthalpic conditions (P = 0.3 GPa).…”

Section: Petrogenesis Of Meltsmentioning

confidence: 99%

Petrogenesis of post – orogenic Lower Permian andesites in southern Europe: insights into the collapse of the Variscan range

Buzzi

Gaggero

2008

Geodinamica Acta

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In the post-Variscan Early Permian deposits of southwestern Europe, andesites belong to successions characterized by the constant occurrence of a basal rhyolite ignimbrite, followed by andesites, and by abundant dacite-rhyodacite products, interbedded with lacustrine sediments. The subalkaline andesite to K-andesite volcanism developed within intramontane basins following the collapse of the Variscan orogen. The compositional features, including trace element ratios and initial Sr (and Nd) of post-Variscan intermediate products allow excluding continental or island arc settings. The andesite composition of Lower Permian lavas was reproduced starting from two potential primary magmas: picrobasaltic and enriched MORB compositions. In particular, the picrobasalt was modified, by adding incremental amounts of a felsic granulite, from the lower continental crust. Mixing and fractional crystallization (MFC) were modelled by the MELTS software in a closed system under isobaric, isenthalpic conditions (P = 0.3 GPa). The computed residual liquid evolves to match closely the composition of Lower Permian andesite lavas after ~34 % crystallization by adding ~27 % of contaminant to the parental magma.

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Systematics of internal zircon morphology in major Variscan granitoid types

Vavra

1994

Contr. Mineral. and Petrol.

113

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The evolution of a calc-alkaline basic to silicic magma system: Geochemical and Rb-Sr, Sm-Nd, and isotopic evidence from the Late Hercynian Atesina-Cima d'Asta volcano-plutonic complex, northern Italy

Cited by 42 publications

References 42 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

Petrogenesis of post – orogenic Lower Permian andesites in southern Europe: insights into the collapse of the Variscan range

Systematics of internal zircon morphology in major Variscan granitoid types

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