Ductile extension in alpine Corsica

Jolivet, Laurent; Dubois, Roland; Fournier, Marc; Goffé, Bruno; Michard, André; Jourdan, Claudie

doi:10.1130/0091-7613(1990)018<1007:deiac>2.3.co;2

Cited by 172 publications

(148 citation statements)

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“…This lithological association has been alteratively attributed to subduction dynamics, based on the frequent reactivation of lithological interfaces (e.g. Mattauer et al, 1981;Péquignot and Potdevin, 1984;Jolivet et al, 1990;Fournier et al, 1991), rift-related tectonics (e.g. Lahondère, 1996;Vitale Brovarone et al, 2011a;Meresse et al, 2012) or tectono-sedimentary processes (olistostromes, Lahondère, 1996).…”

Section: Regionally Exhumed Serpentinized Mantle In Alpine Corsicamentioning

confidence: 99%

Recognizing remnants of magma-poor rifted margins in high-pressure orogenic belts: The Alpine case study

Beltrando

Manatschal

Mohn

et al. 2014

Earth-Science Reviews

122

109

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This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues.Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. Magma-poor rifted margins are being increasingly recognized in present-day Atlantic-type systems. However, findings of fossil areas floored by exhumed mantle or hyper-extended crust are comparatively rare within orogenic belts that were originated through the inversion of pre-existing rifted margins. This discrepancy may be due to the common reactivation of lithological contacts during subduction/orogeny, potentially masking pre-orogenic relationships, and, most importantly, to the frequent lack of a preorogenic layer-cake architecture, hindering retro-deformation of multiply deformed tectonic units. This study outlines a methodology to detect sections of magma-poor, hyper-extended rifted margins without a layer-cake architecture in multiply deformed/metamorphosed terrains. This approach is defined by comparison to well studied examples of fossil analogues preserved in weakly deformed parts of Alpine orogens. In the latter domains, continental basement and hydrated peridotites were exhumed at the basin floor during Jurassic rifting along long-offset detachment systems. Extensional geometries locally resulted in tectonic sampling of laterally discontinuous slivers of allochthonous continental basement and pre-rift sediments from the hanging wall blocks. Lithostratigraphic associations consisting of continental basement rocks directly juxtaposed with syn-to post-rift meta-sediments and/or serpentinized subcontinental mantle are widespread within sections of Alpine-type orogenic belts that underwent high-to ultra-high-pressure metamorphism. However, similar associations may arise from a variety of processes other than rift-related lithospheric thinning in magma-poor environments, including subduction mélange dynamics or deposition of sedimentary mélanges along convergent/divergent margins. The partial preservation of rift-related lithostratigraphic associations may still be assessed, despite the lack of biostratigraphic evidence, by (1) the consistency of the lithostratigraphic architecture over large areas, despite pervasive Alpine deformation, which rules out chaotic mixing during subduction/ exhumation, (2) the presence of clasts of basement rocks in the neighboring meta-sediments, indicating the original proximity of the different lithologies, (3) evidence of brittle deformation in continental basement and ultramafic rocks pre-dating Alpine metamorphism, indicating that they were juxtaposed by fault activity prior to the deposition of post-rift sediments, and (4) the similar Alpine tectono-metamorphic evolution of ophiolites, continental basement and meta-sediments. A re-assessment of basement-cover relationships in...

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Section: Regionally Exhumed Serpentinized Mantle In Alpine Corsicamentioning

confidence: 99%

Recognizing remnants of magma-poor rifted margins in high-pressure orogenic belts: The Alpine case study

Beltrando

Manatschal

Mohn

et al. 2014

Earth-Science Reviews

122

109

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“…It can be compared with the detachment observed in Crete [Jolivet et al, 1996], below which the highpressure assemblages are well preserved and which was probably formed at the top of a growing thrust wedge. We do not object to the extensional nature of the basal contact of the Calcare Cavernoso, but we suggest that it is not comparable with other core complexes found in the Basin and Range Province of the western United States or the Aegean.…”

Section: Regional Significance Of Extension In the Apuan Alpsmentioning

confidence: 99%

“…The structural and metamorphic study presented herein is the synthesis of several previous studies [Jolivet et al, 1990; The relationships between the deformation history and the pressure-temperature evolution was systematically studied using the petrology of metapelites. In mountain belts, highpressure and low-temperature conditions are usually well …”

Section: Metamorphic and Structural Evolutionmentioning

confidence: 99%

Midcrustal shear zones in postorogenic extension: Example from the northern Tyrrhenian Sea

Jolivet¹,

Faccenna²,

Goffé³

et al. 1998

J. Geophys. Res.

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482

506

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“…1), each of them corresponding to different peak metamorphic con- These occurrences document the progressive underthrusting of these units down to different depths and their insequence contractional exhumation within an Alpine-age, east-dipping subduction system (Mattauer et al, 1981;Bezert and Caby, 1988;Jolivet et al, 1990;Garfagnoli et al, 2009;Molli and Malavieille, 2011;Maggi et al, 2012;Di Rosa et al, 2016;Guyedan et al, 2017;Beaudoin et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

“…This subject has been well developed and explored (Austrheim and Andersen, 2004;Andersen and Austrheim, 2006;Healy et al, 2009;Andersen et al, 2014;Deseta et al, 2014a, b;Magott et al, 2016a, b) in northeast Corsica (so-called "Alpine Corsica"), which is formed by relicts of subduction orogen related to the CretaceousMiddle Tertiary Europe-Adria convergence history (Lahondère, 1988;Fournier et al, 1991;Handy et al, 2010;Molli and Malavieille, 2011). These studies focused on oceanic units made up of peridotite, serpentinite, gabbro, basalt, calcareous and siliceous schist, and marble exposed as remnants of the lithosphere of the Jurassic Piemonte-Liguria oceanic basin and its pelagic sedimentary cover (Mattauer et al, 1981;Bezert and Caby, 1988;Jolivet et al, 1990;Molli, 2008;Vitale Brovarone et al, 2013, and references therein).…”

Section: Introductionmentioning

confidence: 99%

Switching deformation mode and mechanisms during subduction of continental crust: a case study from Alpine Corsica

Molli

Menegon

Malasoma³

2017

Solid Earth

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Abstract. The switching in deformation mode (from distributed to localized) and mechanisms (viscous versus frictional) represent a relevant issue in the frame of crustal deformation, being also connected with the concept of the brittle-"ductile" transition and seismogenesis. In a subduction environment, switching in deformation mode and mechanisms and scale of localization may be inferred along the subduction interface, in a transition zone between the highly coupled (seismogenic zone) and decoupled deeper aseismic domain (stable slip). However, the role of brittle precursors in nucleating crystal-plastic shear zones has received more and more consideration being now recognized as fundamental in some cases for the localization of deformation and shear zone development, thus representing a case in which switching deformation mechanisms and scale and style of localization (deformation mode) interact and relate to each other. This contribution analyses an example of a millimetrescale shear zone localized by brittle precursor formed within a host granitic protomylonite. The studied structures, developed in ambient pressure-temperature (P -T ) conditions of low-grade blueschist facies (temperature T of ca. 300 • C and pressure P ≥ 0.70 GPa) during involvement of Corsican continental crust in the Alpine subduction. We used a multidisciplinary approach by combining detailed microstructural and petrographic analyses, crystallographic preferred orientation by electron backscatter diffraction (EBSD), and palaeopiezometric studies on a selected sample to support an evolutionary model and deformation path for subducted continental crust. We infer that the studied structures, possibly formed by transient instability associated with fluctuations of pore fluid pressure and episodic strain rate variations, may be considered as a small-scale example of fault behaviour associated with a cycle of interseismic creep and coseismic rupture or a new analogue for episodic tremors and slow-slip structures. Our case study represents, therefore, a fossil example of association of fault structures related to stick-slip strain accommodation during subduction of continental crust.

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Ductile extension in alpine Corsica

Cited by 172 publications

References 0 publications

Recognizing remnants of magma-poor rifted margins in high-pressure orogenic belts: The Alpine case study

Recognizing remnants of magma-poor rifted margins in high-pressure orogenic belts: The Alpine case study

Midcrustal shear zones in postorogenic extension: Example from the northern Tyrrhenian Sea

Switching deformation mode and mechanisms during subduction of continental crust: a case study from Alpine Corsica

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