During the late Paleozoic-early Mesozoic huge volumes of plutonic and volcanic rocks, as well as widespread basic to acidic dyke swarms, were produced mostly related to extensional tectonics that took place after the final stages of the Variscan continental collision, causing wrenching and faulting of the crust and subsequent continental break-up leading to the definitive Jurassic opening of the Tethys ocean (e.g., WILSON et al., 2004). In south-western Europe the dyke magmatism shows a well defined time distribution in terms of magmatic affinity (calc-alkaline, alkaline and tholeiitic; OREJANA et al., 2008 and references therein). Calc-alkaline magmas were mainly produced during the Permo-Carboniferous and are now disseminated throughout Europe. Late- to post-Variscan dykes also outcrop in the Calabria Peloritani Orogen (CPO; Southern Italy), but information on the petrological features and geodynamic meaning of the CPO dyke magmatism is still very scarce, with only very few studies up to now carried out in both the northern (Sila Grande; FESTA et al., 2010 and reference therein) and southern sector (Serre Massif; ROMANO et al., 2011) of the orogen. In this study, we supply preliminary information about the petrographic features, mineral chemistry, whole-rock major and trace elements and Sr-Nd isotopic composition of a dyke crosscutting the late-Varsican granitoids of the Sila batholith (MESSINA et al., 1991a,b; AYUSO et al., 1994) in the area of the Lake Ampollino (Sila Massif, northern Calabria).
|Titolo:||Petrologic constraints on post-Variscan andesite dyke magmatism in the Sila Massif (northern Calabria)|
|Data di pubblicazione:||2012|
|Appare nelle tipologie:||4.1 Contributo in Atti di convegno|