2001
DOI: 10.1093/petrology/42.2.433
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Abstract: Pipe-like ultramafic bodies, hosting Ni-Cu-PGE sulphide deposits, INTRODUCTIONintrude the Main Gabbro and the roof metasediments of the Ivrea The Ivrea Zone, in NW Italy, is believed to represent an Zone, NW Italy. These bodies were emplaced at 287 ± 3 Ma exposed section of the lower continental crust (Mehnert, and represent the last mantle-derived melts associated Garuti et al., 1980;Percival et al., 1992) whose underplating event that largely drove the crustal evolution of this area evolution has been largel… Show more

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Cited by 67 publications
(76 citation statements)
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“…The authors identified the existence of mixed age populations in one of their samples (RA616), pointing to the presence of older age components. These SHRIMP ages, however, do not contradict the slightly older Pb-Pb evaporation ages of Garuti et al (2001) between 287 and 292 Ma. The mixed population including Variscan (300 Ma-old) growth zones, however, urges for caution with the interpretation of these older ages, since the Pb-Pb ages are not able to resolve lead loss and inheritance.…”
Section: Crustal Scale Magmatism: Age Genetic Links and Origincontrasting
confidence: 60%
“…The authors identified the existence of mixed age populations in one of their samples (RA616), pointing to the presence of older age components. These SHRIMP ages, however, do not contradict the slightly older Pb-Pb evaporation ages of Garuti et al (2001) between 287 and 292 Ma. The mixed population including Variscan (300 Ma-old) growth zones, however, urges for caution with the interpretation of these older ages, since the Pb-Pb ages are not able to resolve lead loss and inheritance.…”
Section: Crustal Scale Magmatism: Age Genetic Links and Origincontrasting
confidence: 60%
“…The most recent investigations are those of Zanetti et al (1999), Garuti et al (2000) and Grieco et al (2001). Zanetti et al (1999) proposed that the phlogopite peridotite was modified in a single metasomatic event that also gave rise to the clinopyroxenite dikes.…”
Section: Geology and Petrographymentioning
confidence: 99%
“…9.73 CaO < mdl < mdl < mdl < mdl < mdl 0.32 < mdl 0.24 < mdl < mdl < mdl < mdl < mdl < mdl < mdl < mdl < mdl 0.30 < mdl < mdl < mdl 0.18 < mdl 0.17 < mdl < mdl < mdl 0.18 < mdl < mdl < mdl < mdl < mdl 0.10 < mdl < mdl Na 2 O < mdl < mdl < mdl < mdl < mdl < mdl < mdl < mdl < mdl < mdl < mdl < mdl < mdl < mdl < mdl < mdl < mdl < mdl K 2 O < mdl < mdl < mdl < mdl < mdl < mdl < mdl < mdl < mdl < mdl < mdl < mdl < mdl < mdl < mdl < mdl < mdl < mdl They contended that the peridotite was infiltrated by melt from the subducted eclogite-facies slab, and that the clinopyroxenite dikes represent melt-dominated areas in the melt-rock mush. Garuti et al (2000) studied ultramafic pipes in the Ivrea zone and advocated a deep-mantle source for the fluid that contaminated the pipes and phlogopite peridotite. Grieco et al (2001), based on detailed field and petrologic studies, contended that there were two genetically distinct metasomatic events separated in time.…”
Section: Geology and Petrographymentioning
confidence: 99%
“…We propose that these Nd isotopic variations are not only controlled by contamination evolutionary trends, but also reflect a derivation from isotopically heterogeneous mantle melts. This inference is substantiated by the pipe-like mafic-ultramafic bodies intruding the lower-crust section of Ivrea Zone (Western Alps), which have initial ɛ Nd ranging from +3.7 to −1.9 (Garuti et al, 2001). These mafic-ultramafic dykes were dated at 287 ± 3 Ma and considered to be essentially crustally uncontaminated, mainly on the basis of their S isotope compositions (δ 34 S = 0.0 to +0.9; Garuti et al, 2001).…”
Section: Comparison With Early Permian Gabbroic Sequences From Westermentioning
confidence: 98%
“…ɛ Nd calculated at 290 Ma of calc-alkaline hornblende-granitoids (Cocherie et al, 1994) are also reported. (C) Initial ɛ Nd of least contaminated Early Permian maficultramafic intrusives from Western-Central Alps and Northern Apennine: Mont Collon olivine-cumulates after Monjoie (2004), Sondalo olivine-gabbros after Tribuzio et al (1999), least contaminated Ivrea gabbros after Voshage et al (1990), Ivrea ultramafic pipes after Garuti et al (2001), Mg-rich gabbros from External Liguride units after Montanini and Tribuzio (2001). excluded. To verify the petrogenetic relations between the basalt dykes and olivine-gabbronorite cumulates, we calculated the incompatible element compositions of melts in equilibrium with clinopyroxenes from the olivine-gabbronorites.…”
Section: Origin Of the Basalt Dykes And Their Petrogenetic Relations mentioning
confidence: 99%