2007
DOI: 10.3166/ga.20.3-19
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Different PT paths recorded in a tectonic mélange (Voltri Massif, NW Italy): implications for the exhumation of HP rocks

Abstract: The Cascine Parasi Mélange (CPM) of the high-pressure, meta-ophiolitic Voltri Massif (Ligurian Western Alps), consists of a foliated chlorite-actinolite greenschist matrix enclosing lenses of metabasites and metasediments. The surrounding units consist of serpentinites not enclosing these metamorphic rocks. The matrix records three sets of folds: (i) Dm1/Dm2 (blueschist to greenschist-facies conditions), which can be correlated to folds in the metasedimentary blocks; (ii) Dm3, which are the most obvious in the… Show more

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Cited by 21 publications
(13 citation statements)
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“…The low Ti content of the BEIG zircon rims is in line with growth at T ≤ 650°C [ Watson et al , 2006]. Petrological evidence shows that the Voltri‐Rossiglione Unit, during its metamorphic evolution (from burial to exhumation), never experienced temperatures in excess of ∼550°C [ Cimmino and Messiga , 1979; Hoogerduijn Strating , 1991; Federico et al , 2007a] (see also this study). The euhedral shape and the sharp boundaries with the magmatic zircon core suggest that the rims represent new growth and not recrystallized domains.…”
Section: Discussionsupporting
confidence: 61%
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“…The low Ti content of the BEIG zircon rims is in line with growth at T ≤ 650°C [ Watson et al , 2006]. Petrological evidence shows that the Voltri‐Rossiglione Unit, during its metamorphic evolution (from burial to exhumation), never experienced temperatures in excess of ∼550°C [ Cimmino and Messiga , 1979; Hoogerduijn Strating , 1991; Federico et al , 2007a] (see also this study). The euhedral shape and the sharp boundaries with the magmatic zircon core suggest that the rims represent new growth and not recrystallized domains.…”
Section: Discussionsupporting
confidence: 61%
“…1. D 1 ‐M 1 stage corresponds to peak metamorphism under blueschist to eclogitic facies conditions [e.g., Liou et al , 1998; Brouwer et al , 2002; Vignaroli et al , 2005; Federico et al , 2007a, 2007b], which is assigned to the time interval between ∼34 and ∼50 Ma [see also Rubatto and Scambelluri , 2003; Federico et al , 2005, 2007b]. The D 1 fabric has been extensively overprinted and no structural/kinematics data could be obtained.…”
Section: Discussionmentioning
confidence: 99%
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