LOCATELLI , Michele

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The Monviso metaophiolite complex (W. Alps) is an almost intact fragment of Tethyan oceanic lithosphere metamorphosed to eclogite-facies peak metamorphic conditions during Alpine subduction. This 1:20.000 scale geological map encompasses, in an area of ∼35 km2, the Monviso Unit (MU) and the Lago Superiore Unit (LSU). Major focus was given to...

The exhumation of high-pressure (HP), metaophiolitic terrains is a long-studied process, and many different models have been proposed so far, since the problem of how dense HP metamorphosed oceanic mafic and ultramafic rocks are exhumed from deep is crucial to understanding processes occurring at the plate interface and mantle wedge within...

The Monviso meta-ophiolite complex (Northern Italy, Western Alps) represents an almost intact fragment of Tethyan oceanic lithosphere metamorphosed at ~80 km depth (~2.6GPa–550 °C) during the Alpine subduction. We focus our study on a major shear zone cutting across this slab fragment at low angle (the Lower Shear Zone; LSZ). Here, in its talc...

The North Victoria Land structural framework is characterized by the long-lived tectonic activity along major crustal lineaments, including the NNW-SSE and NW-SE trending Rennick Graben Fault (RGF) system and Aviator Fault (AF). This tectonic corridor is characterized by an important strike-slip component that is easily connected to the main...

Brecciated eclogite clasts from the Monviso ophiolite in the Western Alps fossil subduction zone preserve healed fractures within garnet crystals. These fractures are divided into two distinct populations based on chemical and textural criteria. Diffusion modeling on profiles across fractures identifies a characteristic diffusive timescale for...

Faults and shear zones in the metamorphic ultramafic rocks of the Voltri Massif (Ligurian Alps, NW Italy) are often accompanied by intense or complete carbonation of the host rocks. One of these fault zones, hosted in peridotite and serpentinite, is characterized by distinctive structural features that can be related to a fluidassisted...

The Queyras-Monviso traverse of the Schistes Lustrés complex, is a stack of underplated nappes of oceanic rocks subducted from blueschist- to eclogite-facies conditions. This study reports on salinities and gas contents of primary fluid inclusions trapped in high pressure veins from metasediments and metamafic rocks (445 fluid inclusions in 22...

Episodic fluid overpressure and escape is invoked as a cause or consequence of many subduction-zone seismic phenomena but can be challenging to constrain in exhumed high-pressure metamorphic rocks. In situ measurements of lithium isotopes in garnet reveal evidence of episodic fluid transport in a subduction shear zone now exposed in the Monviso...