Ferro- and magnesiocarpholite from the Monte Argentario (Italy): First evidence for high-pressure metamorphism of the metasedimentary Verrucano sequence, and significance for P-T path reconstruction

Theye, Thomas; Reinhardt, Juergen; Goffé, Bruno; Jolivet, Laurent; Brunet, Christophe

doi:10.1127/ejm/9/4/0859

Cited by 67 publications

(56 citation statements)

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“…This is in agreement with the evolution of some tectonic units in Southern Tuscany, i.e. M. Argentario (Theye et al 1997) and M.Leoni/ Montagnola Senese (Giorgetti et al 1998), as well as with the ®ndings of Jolivet et al (1998) for the Alpi Apuane.…”

Section: Discussionsupporting

confidence: 84%

“…(the Mg-end-member version of reaction 1) indicates a pressure, at this stage, higher than 0.8 GPa and temperature higher than 400 C. The isopleth for reaction (1) is shifted towards slightly lower pressure (0.8 GPa at 400 C) when considering Chl 3 (inside the chloritoid) and the equilibrated chloritoid (Cld 3 r.3). Possible sources of error include uncertainties in the thermodynamic data; these result in uncertainties in pressure and temperature of c.AE 0.2 GPa and c.AE 20 C, respectively (Theye et al 1997). The chloritoid±chlorite Mg±Fe-exchange thermometer calibrated by Vidal et al (1999) C is obtained, which can be interpreted as the temperature for the early retrograde stage.…”

Section: P±t Conditions and Metamorphic Pathmentioning

confidence: 99%

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Structural and petrological constraints on the tectono‐metamorphic evolution of the Massa Unit (Alpi Apuane, NW Tuscany, Italy)

2000

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A study of the metamorphic and tectonic evolution of the Massa Unit in the Alpi Apuane Metamorphic Complex shows that this unit suffered relatively high-pressure conditions (peak higher than 0.8 GPa) and was exhumed during a multiphase history. The ®rst stage of exhumation occurred during Tertiary continental collision between Adria and Sardinia/Corsica and was associated with the thrusting of the more deeply buried chloritoid kyanite-bearing Massa Unit on top of the less deeply buried chloritoid pyrophyllite-bearing Apuane Unit. The subsequent stages of exhumation were shared by the two metamorphic units and were coeval with the beginning of crustal extension related to the opening of the Tyrrhenian Sea.

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Section: Discussionsupporting

confidence: 84%

Section: P±t Conditions and Metamorphic Pathmentioning

confidence: 99%

Structural and petrological constraints on the tectono‐metamorphic evolution of the Massa Unit (Alpi Apuane, NW Tuscany, Italy)

2000

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“…Bézert and Caby 1988;Brunet et al 2000;Chopin et al 2008;Dal Piaz and Zirpoli, 1979;Danisik et al 2007;Fournier et al, 1991;Lahondère and Guerrot 1997;Lahondére 1996;Tribuzio and Giacomini 2002;Molli 2008;Vitale Brovarone et al 2009), Southern Tuscany and Alpi Apuane (based on Kligfield et al 1986;Fellin et al 2007;Giorgetti et al 1998;Jolivet et al 1998;Molli et al 2000;Rossetti et al 2002;Theye et al 1997) Corsican-derived continental units and continental slices from the former OCT show a variable high-pressure/lowtemperature metamorphic imprint. It ranges from lower grade (high-pressure greenschist to lower blueschist facies) in the external and presently geometrically lowermost units, to eclogite facies in the more internal and uppermost ones (Figs.…”

Section: Corsicamentioning

confidence: 95%

Orogenic processes and the Corsica/Apennines geodynamic evolution: insights from Taiwan

Molli

Malavieille

2010

Int J Earth Sci (Geol Rundsch)

116

136

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International audienceThe Alps/Apennines system, as well as many collisional orogens through the world, shows a finite deformation produced during a long geological history which involves numerous superimposed tectonic events. As a result, complex and often contrasted reconstructions for the setting and tectonics of the different stages of the growing and interfering Alps/Apennines system have been proposed. To enlight some of the geometric and kinematic signatures related to past geodynamics in the composite Alps(Corsica)/Apennines system, we analyse the major deformation processes, their superimposition, and resulting finite structural geometries in the currently growing Taiwan orogenic system. The Taiwan island and its offshore northward and southward prolongations represent the emerged and the sub-marine parts of an orogenic wedge related to the interactions between the Eurasian and the Philippine Sea and recording different subduction settings. Using the Taiwan actualistic geodynamic scenarios and the related first-order geometric-kinematic constraints, we will attempt a reconstruction of the tectonic evolution for the Corsica/Apennines orogenic system foregrounding the key role of continental subduction and subduction reversal during such evolution

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“…This tectonic unit was affected by two Alpine tectono-metamorphic events of low-greenschist-facies grade (Franceschelli et al 1986;Costantini et al 1988;Elter and Pandeli 1990;Corsi et al 2001) and subsequent weak folding (Corsi et al 2001) and faulting (Liotta et al 1998;Decandia et al 2001 and reference therein). Additionally, evidence of HP-LT metamorphism of Verrucano Group rocks has been documented in the Argentario Mount and Leoni Mount areas (Theye et al 1997;Giorgetti et al 1998;Brunet et al 2000). The sedimentary features of the Verrucano Group rocks are nevertheless readily recognisable notwithstanding their tectonic and metamorphic overprints; and for economy of expression the prefix ''meta'' is therefore omitted in lithological names used in reference to these rocks herein.…”

Section: The Metamorphic Verrucano Siliciclastics (Verrucano Group)mentioning

confidence: 93%

The Mesozoic continental rifting in the Mediterranean area: insights from the Verrucano tectofacies of southern Tuscany (Northern Apennines, Italy)

Aldinucci

Gandin

Sandrelli

2007

Int J Earth Sci (Geol Rundsch)

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In the Alpine-Mediterranean region, the continental redbeds and shallow-marine siliciclastics related to the early depositional phases of the Late Permian-Mesozoic continental rifting are referred to as the most common representative of the ''Verrucano tectofacies''. The Verrucano-type successions exposed in southern Tuscany are diachronous, spanning from Triassic to earliest Jurassic in age, and accumulated within the Tuscan domain, a paleogeographic region of continental crust that due to the opening of the Piedmont-Ligurian ocean formed part of the Adria passive-margin. They belong to the metamorphic Verrucano Group and the non-metamorphic Pseudoverrucano fm. Viewed overall, these Verrucano-type successions appear to manifest five episodes or pulses of an ongoing continental rifting. With the exception of the first episode that developed entirely within a terrestrial setting, each one is represented by basal Verrucano-type continental siliciclastics overlain by compositionally mixed marine deposits, which resulted from four diachronous, post-Middle Triassic transgressions. This suite of tectonic pulses produced the progressive westward widening (backstepping) of the Tuscan domain in the rifting south-Tuscany area.

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Ferro- and magnesiocarpholite from the Monte Argentario (Italy): First evidence for high-pressure metamorphism of the metasedimentary Verrucano sequence, and significance for P-T path reconstruction

Cited by 67 publications

References 0 publications

Structural and petrological constraints on the tectono‐metamorphic evolution of the Massa Unit (Alpi Apuane, NW Tuscany, Italy)

Structural and petrological constraints on the tectono‐metamorphic evolution of the Massa Unit (Alpi Apuane, NW Tuscany, Italy)

Orogenic processes and the Corsica/Apennines geodynamic evolution: insights from Taiwan

The Mesozoic continental rifting in the Mediterranean area: insights from the Verrucano tectofacies of southern Tuscany (Northern Apennines, Italy)

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