Exhumation History of a Garnet Pyroxenite-bearing Mantle Section from a Continent-Ocean Transition (Northern Apennine Ophiolites, Italy)

Pyroxenite xenoliths from Marsabit (Northern Kenya): evidence for different magmatic events in the lithospheric mantle and interaction between peridotite and pyroxenite

“…1d) and peridotite (Group IV; Kaeser et al 2006) are in accordance with similar observations from Pyrenean massifs as well (Fabriès et al 1998). Moreover, the deciphered P-T path, microstructures and compositional features of the Marsabit pyroxenites are similar to pyroxenites from ultramafic massifs exhumed during continental rifting processes, namely, from Malenco (Müntener and Hermann 1996), the Ligurides (Montanini et al 2006), and from Zabargad (Piccardo et al 1988;Kurat et al 1993;Vannucci et al 1993;see Fig. 8).…”

“…1a-e) and are microstructurally similar to grt pyroxenite layers described from exhumed peridotite massifs (e.g., Lherz: Conquéré 1977; the Ligurides: Montanini et al 2006;Zabargad: Piccardo et al 1988;Malenco: Müntener and Hermann 1996). The degree of deformation ranges from undulous extinction in pyroxenes in weakly deformed samples (Fig.…”

Orogenic, Ophiolitic, and Abyssal Peridotites

“…Erro-Tobbio in the Voltri group, western Liguria (Bezzi and Piccardo, 1971;Borghini et al, 2007;Chiesa et al, 1975;Hoogerduijn-Strating et al, 1990;Messiga and Piccardo, 1974;Piccardo and Vissers, 2007;Piccardo et al, 1980Piccardo et al, , 1988aRampone and Borghini, 2008;Rampone et al, 2005;Vissers et al, 1991); and 5. Peridotites from the External Ligurides in eastern Liguria (Bezzi and Piccardo, 1971;Galli and Cortesogno, 1970;Montanini et al, 2006;Piccardo, 1976).…”

“…Several pioneering studies on orogenic peridotites included at least one or a few samples from Lanzo (e.g., Ernst and Ottonello, 1984;Hamelin and Allègre, 1988;Loubet and Allègre, 1982;Loubet et al, 1975;Menzies, 1976;Menzies and Murthy, 1978;Menzies et al, 1977;Ottonello et al, 1984a;Richard and Allègre, 1980;Roy-Barman et al, 1996), and several studies were entirely devoted to Lanzo or the Ligurian peridotites (e.g., Beccaluva et al, 1984;Bodinier, 1988;Bodinier et al, 1986Bodinier et al, , 1991Ernst and Piccardo, 1979;Lorand et al, 1993;Ottonello et al, 1979Ottonello et al, , 1984bRampone et al, 1993Rampone et al, , 1995Snow et al, 2000;Scambelluri et al, 2001). With few exceptions, recent studies on these massifs were chiefly devoted to constrain the relationships between reactive melt infiltration (refertilization), lithospheric thinning, and rifting in the Liguro-Piemontese basin (Borghini et al, 2007;Kaczmarek and Mü ntener, 2005, 2008, 2010Montanini et al, 2006;Mü ntener et al, 2004Mü ntener et al, , 2005Piccardo and Vissers, 2007;Piccardo et al, 2005Piccardo et al, , 2007aRampone et al, 2004Rampone et al, , 2005Rampone and Borghini, 2008).…”

Petrological evolution of the European lithospheric mantle: introduction

“…Garnet-and spinel-bearing pyroxenites are relatively abundant in the lithospheric mantle of both the European and Adriatic plates (Montanini et al 2006;Piccardo & Vissers 2007;. A rare case of graphite-bearing garnet clinopyroxenite occurs in an ultramafic complex in the External Ligurides.…”