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Communication Dans Un Congrès Année : 2015

Geochemistry and tectonic significance of lherzolites from New Caledonia Ophiolite

Résumé

The association of rocks with contrasting geodynamic affinities is a quite common feature in ophiolites and it has been documented in several ophiolitic complexes, such as Pindos (Greece), and Lycian and Antalya ophiolites (Turkey) (Saccani, Photiades 2004; Aldanmaz et al. 2009). New Caledonia hosts one of the World’s largest ultramafic terrane termed “Peridotite Nappe” belonging to an “atypical” ophiolitic sequence of presumed Late Cretaceous- Early Eocene age. It is dominated by mantle lithologies, mostly harzburgite and minor spinel and plagioclase lherzolite, together with some mafic and ultramafic cumulates. Despite their ultra-depleted nature, some efforts were devoted to characterize the mantle rocks from a geochemical point of view. A supra-subduction affinity is generally accepted for harzburgites (Marchesi et al. 2009; Ulrich et al. 2010); in contrast, the origin and evolution of lherzolites still remain a matter of debate. This presentation will focus on the petrological and geochemical characterization of the lherzolitic rocks.
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Dates et versions

hal-03934146 , version 1 (14-02-2023)

Identifiants

  • HAL Id : hal-03934146 , version 1

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Arianna Secchiari, Alessandra Montanini, Delphine Bosch, Patrizia Macera, Dominique Cluzel. Geochemistry and tectonic significance of lherzolites from New Caledonia Ophiolite. 2nd European Mantle Workshop, Mineralogical Society of Poland, Aug 2015, Wroclow, Poland. ⟨hal-03934146⟩
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