Source-inherited compositional diversity in granite batholiths: The geochemical message of Late Paleozoic intrusive magmatism in central Calabria (southern Italy)

Timescales and mechanisms of batholith construction: Constraints from zircon oxygen isotopes and geochronology of the late Variscan Serre Batholith (Calabria, southern Italy)

“…(modified after Caggianelli and Prosser, 2002;Caggianelli et al, 2013;Fiannacca et al, 2015;Fornelli et al, 1994;Schenk, 1980) with the locations of dated granitoid samples (stars). Locations of samples dated by Langone et al (2014;circles) are also shown.…”

“…These alternative mechanisms have different implications for the way that magma pulses might interact with each other and, ultimately, for the processes responsible for the compositional diversity of granitoid magmas (e.g., fractional crystallisation and mixing versus near-source processes; Clemens and Stevens, 2012 and references therein;Fiannacca et al, 2015;Glazner et al, A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT 9 multistage decompression. The age peak at c. 300 Ma was considered to record the end of partial melting in the lower-crustal metabasites, and the whole 60-70 Ma time interval was interpreted to be the duration of anatectic conditions in the Serre lower crust.…”

Poly-Orogenic Melting of Metasedimentary Crust From a Granite Geochemistry and Inherited Zircon Perspective (Southern Calabria-Peloritani Orogen, Italy)

“…As for the late Variscan granites, mantle-derived magmas are mostly considered to have contributed only the heat necessary to partially melt the lower crustal metaigneous and metasedimentary source rocks of the ∼300-290 Ma Serre Batholith (e.g., Fiannacca et al, 2015Fiannacca et al, , 2017, in a context of lithospheric thinning and basaltic magma underplating following the earlier stages of orogenic decompression. Decompression alone, with no heat input from basaltic magma, is considered to have produced the slightly older (304-300 Ma), small, strongly peraluminous plutons by partial melting of metasediments (e.g., Caggianelli et al, 2003;Fiannacca et al, 2008).…”

“…After the thickening-related baric peak, scattered small late Carboniferous (∼314-300 Ma) early post-collisional plutons of weakly to strongly peraluminous leucotonalite to leucogranite were emplaced (Rottura et al, 1993;Graessner et al, 2000;Fiannacca et al, 2005Fiannacca et al, , 2008Fiannacca et al, , 2019. These were followed by batholith-scale magmatism at 300-290 Ma (Rottura et al, 1990;Del Moro et al, 2000b;Langone et al, 2014;Fiannacca et al, 2015Fiannacca et al, , 2017 and finally by late-to post-orogenic rhyolitic to andesitic dykes (Festa et al, 2010;Romano et al, 2011Romano et al, , 2012, heralding the early breakup of Pangea (Barca et al, 2010;Cirrincione et al, 2014Cirrincione et al, , 2016.…”

Metasedimentary Metatexites with Trondhjemitic Leucosomes from NE Sicily: Another Example of Prograde Water-fluxed Melting in Collisional Belts

“…The Variscan orogeny was responsible for the formation of most of the CPO basement rocks and was marked by voluminous post-collisional granitoid magmatism. The late Variscan magmatism gave rise first to small, weakly peraluminous trondhjemite plutons, emplaced in the southernmost CPO (Aspromonte Massif and Peloritani Mountains) at c. 314 Ma [15,19,20], then to strongly peraluminous leucogranodiorite-leucogranite plutons scattered throughout the CPO, at c. 304-300 Ma [20,29,30] and, finally, to the composite Serre and Sila batholiths in central and northern Calabria, at c. 297-292 Ma ( [21,[31][32][33][34] and references therein). Granitoid magmatism was followed by late-to post-orogenic rhyolitic to andesitic subvolcanic magmatism [35,36], later evolving to the early breakup of Pangea, as documented by the production of sodic-alkaline to tholeiitic Triassic basalts in northern Calabria [37] as well as in central-western Sicily [38,39].…”