Late Eocene lawsonite-eclogite facies metasomatism of a granulite sliver associated to ophiolites in Alpine Corsica

Martin, Laure; Rubatto, Daniela; Brovarone, Alberto Vitale; Hermann, Jörg

doi:10.1016/j.lithos.2011.03.015

Cited by 71 publications

(107 citation statements)

References 69 publications

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“…1c and 2). The first few meters of rock above the serpentinites 159 exhibit intense Alpine metasomatism that has already been described in previous studies 160 (Martin et al, 2011;Vitale Brovarone et al, 2011b, 2014. These metasomatic rinds can be 161 followed for several kilometers along the top of the serpentinite body and are characterized by 162 lawsonite-rich assemblages, but diopside-rich rocks are also common.…”

Section: Structural Occurrence Of Metasomatic Marbles 155mentioning

confidence: 67%

Carbonation by fluid–rock interactions at high-pressure conditions: Implications for carbon cycling in subduction zones

Piccoli

Brovarone

Beyssac

et al. 2016

Earth and Planetary Science Letters

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110

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Section: Structural Occurrence Of Metasomatic Marbles 155mentioning

confidence: 67%

Carbonation by fluid–rock interactions at high-pressure conditions: Implications for carbon cycling in subduction zones

Piccoli

Brovarone

Beyssac

et al. 2016

Earth and Planetary Science Letters

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110

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“…On its upper limb, the serpentinite is alternatively overlain by (i) slivers of continental basement (orthogneiss-paragneiss dissected by metaigneous dykes) preserving relicts of pre-Alpine granulite facies metamorphism, dated at ca. 290 Ma (U-Pb on zircon; Martin et al, 2011;Vitale Brovarone et al, 2011a) (Fig. 12c), (ii) metavolcanics (meta-pillows and basaltic meta-breccias) and (iii) meta-sediments, consisting of manganese-rich metacherts, marbles and calcschists (Fig.…”

Section: Regionally Exhumed Serpentinized Mantle In Alpine Corsicamentioning

confidence: 99%

“…12g). U-Pb geochronology of Alpine zircon rims formed in equilibrium with HP assemblages in a continental basement sliver yielded an age of 34.4 ± 0.8 Ma (Martin et al, 2011), while Lu-Hf estimates in meta-gabbros and metabasalts yielded ages in the 34-35 Ma range (Vitale Brovarone and Herwartz, 2013).…”

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

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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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“…This is largely due to the contrasting tectonic/kinematic models proposed and the paucity of age constraints on the timing of Alpine deformation and metamorphism, particularly for what concerns the East Tenda Shear Zone (ETSZ; Jolivet et al, 1990), the Alpine shear zone boundary between the continental margin of the European plate and the oceanic neo-Tethyan (LigurianPiemontese branch) realm of the Schistes Lustrés Complex (Brunet et al, 2000;Gibbons and Horak, 1984;Gueydan et al, 2003;Jolivet et al, 1990;Maggi et al, 2012Maggi et al, , 2014Molli et al, 2006). Recent geochronological data have been made available for the high-pressure Alpine metamorphism in both the oceanic-derived (Martin et al, 2011;Vitale Brovarone and Herwartz, 2013) and the ETSZ (Maggi et al, 2012) units, which collectively constrain tectonic underplating and peak of subduction zone metamorphism to Eocene times. Nevertheless, still unsolved is (i) the timing of involvement of the European continental margin in the Alpine orogeny (i.e.…”

Section: Introductionmentioning

confidence: 99%

Pressure–temperature–deformation–time of the ductile Alpine shearing in Corsica: From orogenic construction to collapse

Rossetti

Glodny

Theye

et al. 2015

Lithos

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Late Eocene lawsonite-eclogite facies metasomatism of a granulite sliver associated to ophiolites in Alpine Corsica

Cited by 71 publications

References 69 publications

Carbonation by fluid–rock interactions at high-pressure conditions: Implications for carbon cycling in subduction zones

Carbonation by fluid–rock interactions at high-pressure conditions: Implications for carbon cycling in subduction zones

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

Pressure–temperature–deformation–time of the ductile Alpine shearing in Corsica: From orogenic construction to collapse

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