New constraints on the origin and age of Variscan eclogitic rocks (Ligurian Alps, Italy)

U–Pb geochronology of paragneisses and metabasite in the Xitieshan area, north Qaidam Mountains, western China: Constraints on the exhumation of HP/UHP metamorphic rocks

“…REE compositions are important for the interpretation of zircon ages, because zircons grown or recrystallised under eclogite, granulite and amphibolite facies conditions have trace-element patterns controlled by the presence of garnet (HREE and Y) and feldspar (Eu/Eu * ; Rubatto 2002). Garnet may, however, remain stable (or persist metastably) during decompression from eclogite, to granulite and then to amphibolite facies conditions (Giacomini et al, 2007). Mineral inclusions can also provide a link between age and metamorphism (e.g.…”

“…eclogite and granulite), dating different meta- morphic stages by means of zircon geochronology is not straightforward, mainly because it is often difficult to relate zircon U-Pb ages to the P-T conditions of metamorphic equilibration (e.g. Timmermann et al, 2004;Giacomini et al, 2007). REE compositions are important for the interpretation of zircon ages, because zircons grown or recrystallised under eclogite, granulite and amphibolite facies conditions have trace-element patterns controlled by the presence of garnet (HREE and Y) and feldspar (Eu/Eu * ; Rubatto 2002).…”

Vertical strain partitioning in hot Variscan crust: Syn-convergence escape of the Pyrenees in the Iberian-Armorican syntax

“…Convergence led to the subduction and closure of various oceanic domains during the Devonian, HP-LT nappe stacking and exhumation up to ca. 360 Ma (e.g., Paquette et al, 1989;Bosse et al, 2000;Ordóñez Casado et al, 2001;Rodrıǵuez et al, 2003;Roger and Matte, 2005;Giacomini et al, 2006;Ballèvre et al, 2009Ballèvre et al, , 2014Faure et al, 2008Faure et al, , 2009Abati et al, 2010). Pervasive partial melting and late-to post-orogenic extension affected the hinterland of the orogen from ca.…”

Petrogenesis of Early Permian olivine-bearing cumulates and associated basalt dykes from Bocca di Tenda (Northern Corsica): Implications for post-collisional Variscan evolution

“…It consists mainly of syn-to lateorogenic granitoids with overall calc-alkaline affinity of the age range 345 to 300 Ma, locally associated with coeval mafic intrusives and remnants of a low-to high-grade metamorphic basement (Cocherie et al, 1994;Ferré and Leake, 2001;Paquette et al, 2003). This calcalkaline plutonism occurred after the main continental collision, which has been recently dated at 360-350 Ma (Giacomini et al, 2007), and was followed by the intrusion of A-type granite bodies (Bonin et al, 1978;Egeberg et al, 1993;Poitrasson et al, 1994Poitrasson et al, , 1995 and gabbroic sequences that were probably derived from tholeiitic melts (Cocherie et al, 1994;Renna et al, 2006). The A-type granites and associated gabbroic sequences are 280 to 290 Ma old (Paquette et al, 2003;Cocherie et al, 2005;Renna et al, 2007).…”