Abstract Carbonation of mantle rocks during exhumation is reported in present-day oceanic settings, both at mid-ocean ridges and ocean-continent transitions (OCTs). However, the hydrothermal conditions carbonation (i.e., fluid sources, thermal regimes) remain poorly constrained. We focus on an exceptionally well-preserved fossil OCT where have been exhumed carbonated along a detachment fault fr...

The source of metals involved in the formation oceanic ultramafic-hosted hydrothermal Cu-Fe-Co-Zn-Ni mineralization remains poorly constrained. Here, we focus on a fossil mineralized system preserved Platta nappe (SE Switzerland), where mantle rocks were exhumed along detachment faults to seafloor during Jurassic rifting. mineralization, associated with Fe-Ca-metasomatism (ilvaite-hydroandradit...

Serpentinite-hosted massive magnetite ore bodies are reported for the first time in Late Cretaceous Sabzevar ophiolitic belt, northeastern Iran. They show irregular and discontinuous shapes with variable sizes ranging from 30 to 60 cm. Chromian spinel grains observed within both ores host serpentinite. Magmatic chromian spinels, (Cr,Al)-spinel I, compositions close (Mg0.6,Fe0.4)(Cr1.2,Al0.75,Fe...

The assembly of West Gondwana supercontinent involved several complex processes that led to the formation Hoggar shield during Panafrican-Brasiliano event. We present first petro-geochemical, geochronological and field data serpentinite lenses exposed along In-Tedeini domain, within deformed talc-schist magmatic-sedimentary formations. serpentinites preserved main characteristics their parent p...