RT Journal Article
T1 Exhuming a cold case: The early granodiorites of the northwest Iberian Variscan belt—A Visean magmatic flare-up?
A1 Gutiérrez-Alonso, Gabriel
A1 Fernández Suárez, Javier
A1 López Carmona, Alicia
A1 Gärtner, Andreas
AB In this study we report laser ablation–inductively coupled plasma–mass spectrometer U-Pb ages of granitoids from the so-called early granodiorites of the northwest Iberian Variscan belt. The U-Pb results attest to significant magmatic activity in Visean time (ca. 347–337 Ma) that generated a hitherto poorly constrained granitoid suite in the northwest Iberian tract of the western European Variscan belt realm. This early Carboniferous suite (ECS) is mainly composed of peraluminous cold and hot crustal granodiorites and monzogranites with minor associated mafic rocks that attest to minor involvement of mantle melting. Based on the geochronological and geochemical data, we compare the Visean granitoids with younger Variscan granitoids in northwest Iberia and, in view of the tectonothermal scenarios of the Variscan collision in northwest Iberia, propose a model for the genesis of the ECS in northwest Iberia that involves rapid melting upon fast exhumation of the thickened Gondwanan crust in the course of the protracted Variscan collision.
PB Geological Society of America
SN ISSN: 1941-8264, ESSN: 1947-4253
YR 2018
FD 2018-02-09
LK https://hdl.handle.net/20.500.14352/12025
UL https://hdl.handle.net/20.500.14352/12025
LA eng
NO Ministerio de Economía y Competitividad (MINECO)
DS Docta Complutense
RD 20 abr 2025