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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Europe
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Alps
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Piedmont Alps
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Dora Maira Massif (1)
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Western Alps
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Cottian Alps
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Dora Maira Massif (1)
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Ligurian Alps (8)
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Maritime Alps
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Argentera Massif (2)
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Southern Europe
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Italy
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Apennines (1)
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Ligurian Alps (8)
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Dora Maira Massif (1)
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Po Valley (1)
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Sesia-Lanzo Zone (1)
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Western Europe
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Cottian Alps
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Dora Maira Massif (1)
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Maritime Alps
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Argentera Massif (2)
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Mediterranean Sea
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crust (1)
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deformation (3)
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Europe
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Alps
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Piedmont Alps
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Dora Maira Massif (1)
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Western Alps
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Cottian Alps
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Dora Maira Massif (1)
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Ligurian Alps (8)
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Maritime Alps
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Argentera Massif (2)
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-
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Southern Europe
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Italy
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Apennines (1)
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Liguria Italy
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Genoa Italy (1)
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Ligurian Alps (8)
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Piemonte Italy
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Dora Maira Massif (1)
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Po Valley (1)
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Sesia-Lanzo Zone (1)
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Western Europe
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Cottian Alps
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Dora Maira Massif (1)
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Maritime Alps
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Argentera Massif (2)
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faults (1)
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geochemistry (2)
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igneous rocks
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plutonic rocks
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gabbros (2)
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granites (1)
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Mediterranean Sea
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Voltri Group
Geological Model for Naturally Occurring Asbestos Content Prediction in the Rock Excavation of a Long Tunnel (Gronda di Genova Project, NW Italy)
Formation and evolution of a subduction-related mélange: The example of the Rocca Canavese Thrust Sheets (Western Alps)
High-pressure meta-ophiolite boulders and cobbles from northern Italy as possible raw-material sources for “ greenstone ” prehistoric tools: petrography and archaeological assessment
Lawsonite-bearing eclogite from a tectonic mélange in the Ligurian Alps: new constraints for the subduction plate-interface evolution
Fluid-controlled deformation in blueschist-facies conditions: plastic vs brittle behaviour in a brecciated mylonite (Voltri Massif, Western Alps, Italy)
Geology of the Eastern Ligurian Alps: a review of the tectonic units
Abstract We investigate the structural, petrological and compositional features recorded by strongly deformed and melt-percolated Erro–Tobbio peridotites (Voltri Massif, Ligurian Alps, NW Italy), in order to demonstrate that the processes of shear-zone formation and melt percolation are intimately linked by a positive feedback. We focus on spinel and plagioclase peridotites, and extensional shear zones that underwent infiltration by upwelling asthenospheric melts. Shear and porosity bands, which developed during extension prior to melt infiltration, represent important structural and rheological pathways to facilitate and enhance melt infiltration into the extending lithosphere and the ascent of such melts to shallower levels. Our results lend strong support to numerical models addressing the physical processes underlying extensional systems. These show that, in the case of slow–ultraslow continental extension and the subsequent formation of slow–ultraslow spreading oceans, porosity and shear-localization bands may develop in a previously unstructured lithosphere, prior to melt infiltration. Our studies on the Erro–Tobbio peridotites allow a model for the inception of continental extension and rifting to drifting of slow–ultraslow spreading oceans to be proposed. We suggest that integrated studies of on-land peridotites, coupled with geophysical–structural results from modern oceans, may provide clues to the geodynamic processes governing continental extension and passive rifting.