Constraints on the Genesis of Potassium-rich Italian Volcanic Rocks from U/Th Disequilibrium

Tracages isotopiques de l'origine et de l'évolution des magmas en milieu continental :

“…Such a conclusion implies that recent paleoclimatic reconstructions based on younger ages for the Piànico Formation need to be revaluated Brauer et al, 2008 Magmatic Province (NRMP) centers of Alban Hills (Trigila et al, 1995;Freda et al, 1997;Peccerillo, 2005), Vico (Barbieri et al, 1988;Perini et al, 2004;Avanzinelli et al, 2007), Sabatini (Conticelli et al, 1997; and those of Roccamonfîna (Luhr and Gianetti, 1987;Ghiara and Lirer, 1977;Giannetti and Ellam, 1994;Peccerillo, 2005;Conticelli et al, 2008;Rouchon et al, 2008), Ernici (Civetta et al, 1981;Conticelli et al, 2002;Frezzotti et al, 2007). Compositionally, the Vulsini eruption products encompass the entire spectrum of -12 - In revision for submission to Lithos Monteregian Province (Québec).…”

“…Pb .. Pb des laves du sud de l'Ethiopie comparées aux MORBs de la Mer Rouge, aux points chauds de l'Afar et du Kenya 5 (Le Maître, 1989) for the t21d tephra (small circles), t32 (squares) compared to the chemical composition of volcanic rocks from the Northern Roman Magmatic Province (NRMP) centers of Alban Hills (Trigila et al, 1995;Freda et al, 1997;Peccerillo, 2005), Vico (Barbieri et al, 1988;Perini et al, 2004;Avanzinelli et al, 2007), Sabatini (Conticelli et al, 1997; and those of Roccamonfina (Luhr and Gianetti, 1987;Ghiara and Lirer, 1977;Giannetti and Ellam, 1994;Peccerillo, 2005;Conticelli et al, 2008;Rouchon et al, 2008), Ernici (Civetta et al, 1981;Conticelli et al, 2002;Frezzotti et al, 2007). Compositionally, the Vulsini eruption products encompass the entire spectrum of potassic rock types, with a predominance of trachytes and phonolites in terms of erupted volumes.…”

“…Figure 4: a) Trace elements composition of tephra t21d and t32, normalized to the primitive mantle of Wood (1979); b) trace element normalized diagram of tephra t21d and that of trachyte MDO-G dated at 250 Ka and typical of the products of the last eruptive cycle of the Sancy (data from Gillot et al, 1992); c) trace element normalized diagram of tephra t32 plotted against those of Roccamonfina leucite-bearing rocks (data from Conticelli et al, 2008) and those of the Northern Roman Magmatic Province (data source same as Fig. 3) 54…”

The Vesuvius and the other volcanoes of Central Italy

“…13A). Young neapolitan rocks plot close to the mantle end-member suggesting the arrival in the mantle wedge of either an intraplate, through slab tear (Gasperini et al, 2002), or a massive fluid-like components (Avanzinelli et al, 2008 (Fig. 13B) shows leucite-free rocks (lamproite) of the Tuscan province pointing to a crustal end-member, while the leucite-bearing rocks (kamafugites, leucitites) plots at lower values, but still consistently higher than typical upper mantle (e.g., Carlson, 2005).…”

“…Data are from Conticelli et al (1987Conticelli et al ( , 1991Conticelli et al ( , 1997Conticelli et al ( , 2002Conticelli et al ( , 2007Conticelli et al ( , 2009aConticelli et al ( , 2009bConticelli et al ( , 2010aConticelli et al ( , 2010bConticelli et al ( , 2011Conticelli et al ( , 2013Conticelli et al ( , 2015a Conticelli & Peccerillo (1992), Orsi et al (1995), Civetta et al (1997), Ayuso et al (1998), Conticelli (1998), D'Antonio et al (1999a, Castorina et al (2000), Mascle et al (2001), Pappalardo et al (1999Pappalardo et al ( , 2002a, Gasperini et al (2002), Perini et al (2000Perini et al ( , 2003Perini et al ( , 2004, Downes et al (2002), Bell et al (2004Bell et al ( , 2013, ), Cadeaux et al (2005), De Astis et al (2006, Peccerillo & Martinotti (2006), Di Rienzo et al (2007, 2008, Owen (2007), Avanzinelli et al (2008Avanzinelli et al ( , 2012aAvanzinelli et al ( , 2014, …”