Mantle earthquakes frozen in mylonitized ultramafic pseudotachylytes of spinel-lherzolite facies

We report a new type of ultramafic pseudotachylyte that forms a fault- and injection-vein network hosted in the mantle-derived Balmuccia peridotite (Italy). In the fault vein the pseudotachylyte is now deformed and recrystallized into a spinel-lherzolite facies ultramylonite, made of a fine (

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Bibliographic Details
Published in:Geology (Boulder) 2008-08, Vol.36 (8), p.607-610
Main Authors: Ueda, T, Obata, M, Di Toro, G, Kanagawa, K, Ozawa, K
Format: Article
Language:English
Subjects:
Balmuccia Massif
Crystallography
deformation
ductile deformation
Earthquakes
Europe
experimental studies
facies
geologic thermometry
igneous and metamorphic rocks
igneous rocks
Italy
Ivrea-Verbano Zone
mantle
metamorphic rocks
metamorphism
mineral assemblages
mylonites
mylonitization
nesosilicates
olivine
olivine group
orthosilicates
P-T conditions
paleoseismicity
peridotites
Petrology
Piemonte Italy
Plate tectonics
plutonic rocks
preferred orientation
pseudotachylite
Rocks
Seismology
shear
silicates
Southern Europe
spinel lherzolite
structural analysis
ultramafics
ultramylonite
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Summary:We report a new type of ultramafic pseudotachylyte that forms a fault- and injection-vein network hosted in the mantle-derived Balmuccia peridotite (Italy). In the fault vein the pseudotachylyte is now deformed and recrystallized into a spinel-lherzolite facies ultramylonite, made of a fine (
ISSN:0091-7613
1943-2682
DOI:10.1130/G24739A.1