Exhuming a cold case: The early granodiorites of the northwest Iberian Variscan belt—A Visean magmatic flare-up?
| Autor: | Alicia López-Carmona, Andreas Gärtner, Gabriel Gutiérrez-Alonso, Javier Fernández-Suárez |
|---|---|
| Přispěvatelé: | Ministerio de Economía y Competitividad (España), Russian Government |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
гранитоиды
Geodinámica 010504 meteorology & atmospheric sciences Geochemistry Petrología Geology Crust 010502 geochemistry & geophysics 01 natural sciences Mantle (geology) Варисканский орогенный пояс Viséan Carboniferous 2506 Geología Flare up Geoquímica тектонические события Mafic Иберия гранодиориты 0105 earth and related environmental sciences |
| Zdroj: | E-Prints Complutense. Archivo Institucional de la UCM instname GREDOS. Repositorio Institucional de la Universidad de Salamanca Lithosphere, 10(2):194-216 E-Prints Complutense: Archivo Institucional de la UCM Universidad Complutense de Madrid Lithosphere. 2018. Vol. 10, № 2. P. 194-216 Digital.CSIC. Repositorio Institucional del CSIC |
| ISSN: | 2013-4606 |
| Popis: | 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. This work has been funded by the Spanish Ministry of Economy and Competitiveness under the project ODRE III—Oroclines & Delamination: Relations & Effects (CGL2013-46061-P) and Происхождение, металлогения, климатические эффекты и цикличность Крупных Изверженных Провинций (КИП) (Origin, metallogeny, climatic effects, and cyclical large igneous provinces) (14.Y26.31.0012; Russian Federation) to Gutiérrez-Alonso and López-Carmona and CGL-2016-76438-P to Fernández-Suárez. López-Carmona was also funded by a “Juan de la Cierva” grant (reference FJCI-2014-20740). |
| Databáze: | OpenAIRE |
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