Structures, interference patterns, and strain regime during midcrustal deformation in the Alpi Apuane (Northern Apennines, Italy)

Molli, Giancarlo; Vaselli, L.

doi:10.1130/2006.2414(05)

Cited by 19 publications

(22 citation statements)

References 47 publications

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“…A polyphasic deformation characterizes these metamorphic units, which show an early generation of structures associated with underthrusting and synmetamorphic nappe-fold formation, followed by overprinting structures related to exhumation and uplift (Carmignani and Kligfi eld, 1990;Molli and Vaselli, 2006). In the Alpi Apuane, early deformation (D 1 ) was realized at 27-20 Ma, whereas later synmetamorphic deformation (D 2 ) predated 11 Ma (Kligfi eld et al, 1986;Balestrieri et al, 2003).…”

Section: Northern Apennine Geological Outlinementioning

confidence: 97%

Neogene deformation and granite emplacement in the metamorphic units of northern Apennines (Italy): Insights from mylonitic marbles in the Porto Azzurro pluton contact aureole (Elba Island)

Musumeci¹,

Vaselli²

2012

Geosphere

106

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In the northern Tyrrhenian Sea, late Miocene \ud intrusions (Monte Capanne pluton and\ud Porto Azzurro pluton) were emplaced at\ud upper crustal levels (<0.2 GPa) in the thrust\ud systems of Elba Island. The emplacement\ud of intrusive rocks is currently explained\ud in the context of late Miocene extensional\ud tec tonics. New detailed structural data\ud collected along a continuous natural cross\ud section through the contact aureole of the\ud Porto Azzurro pluton (eastern Elba) where\ud strain localization has occurred within two\ud west-dipping decameter-scale carbonate\ud shear zones, namely the Calanchiole and\ud Felciaio shear zones, are reported here.\ud These shear zones, characterized by a lithological\ud difference with calcite and dolomite\ud marbles dominant in the Calanchiole and\ud Felciaio shear zones, respectively, exhibit\ud a similar rheological behavior . They represent\ud two weakened layers in which westdipping\ud mylonitic foliation, sheath folds,\ud boudinage structures, and upright folds\ud developed within the contact aureole .\ud Moreover, in correspondence with the\ud Felciaio shear zone, the inversion of metamorphic\ud facies occurs. Meso- and microstructural\ud data give evidence that most of\ud the deformation and displacement in the\ud shear zones was coeval with contact metamorphism\ud and developed under metamorphic\ud conditions retrograde from pyroxene\ud hornfels to hornblende-hornfels facies.\ud Geometric and kinematic features indicate\ud that both shear zones correspond to ductile\ud thrusts, which led to internal stacking of the\ud contact aureole . Therefore, at Elba Island,\ud emplacement of intrusive rocks coeval with\ud late Miocene crustal shortening gives a new\ud perspective on relations between tectonics\ud and magmatism in the northern Apennines

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Section: Northern Apennine Geological Outlinementioning

confidence: 97%

Neogene deformation and granite emplacement in the metamorphic units of northern Apennines (Italy): Insights from mylonitic marbles in the Porto Azzurro pluton contact aureole (Elba Island)

Musumeci¹,

Vaselli²

2012

Geosphere

106

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“…(c) Corsica‐Northern Apennines. AP, Apuane, Tuscan metamorphic units [ Balestrieri et al ., ; Molli and Vaselli , ]; FV, Farinole‐Volpajola Unit, Corsica [ Mailhé et al ., ; Brunet et al ., ; Ravna et al ., ; Martin et al ., ; Vitale Brovarone and Herwartz , ; Vitale Brovarone et al ., ]; GI, Giglio Island, Tuscan metamorphic units [ Rossetti et al ., ; Balestrieri et al ., ]; GO, Gorgona Island, Schistes Lustrés metapelites [ Brunet et al ., ; Rossetti et al ., ]; PM, Pigno‐Morosaglia unit, Corsica [ Brunet et al ., ; Fellin et al . ; Vitale Brovarone and Herwartz , ; Vitale Brovarone et al ., ]; TE, Tenda unit, Corsica [ Brunet et al ., ; Cavazza et al ., ; Molli et al ., ; Maggi et al ., ].…”

Section: Exhumation Triggered By Motion Of the Upper Plate: The Westementioning

confidence: 98%

Contrasting styles of (U)HP rock exhumation along the Cenozoic Adria‐Europe plate boundary (Western Alps, Calabria, Corsica)

Malusà

Faccenna

Baldwin

et al. 2015

Geochem Geophys Geosyst

120

145

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Since the first discovery of ultrahigh pressure (UHP) rocks 30 years ago in the Western Alps, the mechanisms for exhumation of (U)HP terranes worldwide are still debated. In the western Mediterranean, the presently accepted model of synconvergent exhumation (e.g., the channel-flow model) is in conflict with parts of the geologic record. We synthesize regional geologic data and present alternative exhumation mechanisms that consider the role of divergence within subduction zones. These mechanisms, i.e., (i) the motion of the upper plate away from the trench and (ii) the rollback of the lower plate, are discussed in detail with particular reference to the Cenozoic Adria-Europe plate boundary, and along three different transects (Western Alps, Calabria-Sardinia, and Corsica-Northern Apennines). In the Western Alps, (U)HP rocks were exhumed from the greatest depth at the rear of the accretionary wedge during motion of the upper plate away from the trench. Exhumation was extremely fast, and associated with very low geothermal gradients. In Calabria, HP rocks were exhumed from shallower depths and at lower rates during rollback of the Adriatic plate, with repeated exhumation pulses progressively younging toward the foreland. Both mechanisms were active to create boundary divergence along the Corsica-Northern Apennines transect, where European southeastward subduction was progressively replaced along strike by Adriatic northwestward subduction. The tectonic scenario depicted for the Western Alps trench during Eocene exhumation of (U)HP rocks correlates well with present-day eastern Papua New Guinea, which is presented as a modern analog of the Paleogene Adria-Europe plate boundary.

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“…The deformation structures in the Tuscan metamorphic units were produced during underthrusting of the Adriacontinental margin following the west-vergent subduction of the relict of the Ligurian Tethys ocean and syn-contractional antiformal duplexing later reworked during crustal extension (Carmignani et al 1978;Molli and Vaselli 2006;Molli 2008).…”

Section: Northern Apenninementioning

confidence: 99%

“…The early stages of deformation, occured during underplating at mid-crustal depths, resulting in SW to NE directed overthrusts and NE-facing regional scale tight to isoclinal recumbent folds with a flat-lying axial foliation and a NE/SW directed stretching lineation (Carmignani et al 1978;Carmignani and Kligfield 1990;Molli and Vaselli 2006;Molli 2008). The early foliations are dated by 40 Ar/ 39 Ar geochronology in the range of 27-20 My (Kligfield et al 1986;Deino et al 1992, Brunet et al 2000 and exhumation at 240°C and 9 km of depth around 10-13 Ma as derived by Zircon FT data (Fellin et al 2007).…”

Section: Northern Apenninementioning

confidence: 99%

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

Molli

Malavieille

2010

Int J Earth Sci (Geol Rundsch)

Self Cite

117

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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Structures, interference patterns, and strain regime during midcrustal deformation in the Alpi Apuane (Northern Apennines, Italy)

Cited by 19 publications

References 47 publications

Neogene deformation and granite emplacement in the metamorphic units of northern Apennines (Italy): Insights from mylonitic marbles in the Porto Azzurro pluton contact aureole (Elba Island)

Neogene deformation and granite emplacement in the metamorphic units of northern Apennines (Italy): Insights from mylonitic marbles in the Porto Azzurro pluton contact aureole (Elba Island)

Contrasting styles of (U)HP rock exhumation along the Cenozoic Adria‐Europe plate boundary (Western Alps, Calabria, Corsica)

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

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