Potassic and ultrapotassic magmatism in the circum-Tyrrhenian region: Significance of carbonated pelitic vs. pelitic sediment recycling at destructive plate margins

Origin and evolution of Cenozoic magmatism of Sardinia (Italy). A combined isotopic (Sr–Nd–Pb–O–Hf–Os) and petrological view

“…The incompatible trace element abundance and ratios (e.g., low Nb-Ta, high LILE/HFSE ratios, high Pb) confirm the typical subduction-related geochemical characteristics (e.g., Duggen et al, 2005;Avanzinelli et al, 2009;Lustrino et al, 2011;Fig. 10a).…”

Distribution and physico-chemical data of Italian bottled natural mineral waters

“…Volcanic rocks are abundant throughout Sardinia, and along the eastern margin of Sicily (Carminati, Lustrino, Cuffaro, & Doglioni, 2010;Lustrino, Duggen, & Rosenberg, 2011;Peccerillo, 2005). The peak of Italian volcanic activity occurred during the last Myr along the Tyrrhenian margin with the emplacement of a series of potassic and ultrapotassic volcanic districts of the Roman Comagmatic Province (RCP) in Central-Southern Italy (Avanzinelli, Lustrino, Mattei, Melluso, & Conticelli, 2009;Peccerillo, 2005).…”

Geochemistry of primary-carbonate bearing K-rich igneous rocks in the Awulale Mountains, western Tianshan: Implications for carbon-recycling in subduction zone

“…K-rich igneous rocks, both potassic and ultra-potassic, are usually considered to have formed from the partial melting of amphibole/phlogopite veins or their host mantle wedge, with their K concentrations controlled by the abundance of amphibole/phlogopite in the vein network, the amounts of mantle component involved, and the degree of partial melting (e.g., Conceic ßão and Green, 2004;Avanzinelli et al, 2009;Conticelli et al, 2009a,b). Effective melting of these vein networks required a slab window setting, induced by the break-off of a subducted slab, for the generation of the K-rich mafic magma in the western Tianshan (Yang et al, 2012).…”

“…Partial melting of those pure vein minerals will generate ultrapotassic magmas, whereas increasing interaction between these veins and the surrounding mantle will decrease the alkaline component and result in relatively low-K shoshonites and calc-alkaline rocks Conticelli et al, 2009a,b). This genetic model has been applied to shoshonitic series rocks associated with ultrapotassic rocks, high-K calc-alkaline rocks, and even to calc-alkaline rocks (e.g., Duggen et al, 2005;Altherr et al, 2008;Avanzinelli et al, 2009;Conticelli et al, 2009a).…”