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The Lanzo Massif in the Western Alps consists of three bodies (North, Central and South) of mantle peridotites that were exhumed from the subcontinental mantle lithosphere to the sea floor during lithosphere extension related to the formation of the Jurassic Ligurian Tethys oceanic basin. The North Lanzo protoliths were located at shallower lithospheric levels than the South Lanzo protoliths. During exhumation, early MORB-type fractional melts from the asthenosphere infiltrated and modified the South Lanzo protoliths. Later on, aggregate MORB melts passed through the South Lanzo peridotites, migrating within replacive peridotite channels, and impregnated the North Lanzo peridotites. Ongoing lithosphere...

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