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Post-collisional mafic dykes crosscut the Paleozoic metamorphic basement and late-Variscan plutons in Les Guilleries massif (Catalan Coastal Ranges, NE Iberia). The predominance of mafic phenocrysts, porphyritic texture, abundant amphibole, high MgO and volatile content, together with crustal-like trace-element patterns indicate that the dykes correspond to calc-alkaline lamprophyres, mainly spessartites. Their enrichment in LILE, HFSE and REE and initial Sr-Nd isotopic compositions (87Sr/86Sri between 0.70851 and 0.71127, ε Ndi between-5.23 and-4.63) are consistent with an enriched subcontinental lithospheric mantle source. U-Pb ages of matrix titanite crystals yield concordia ages of 262±7Ma, congruent with crosscutting relationships. Post-magmatic processes are evidenced by intense chloritization and albitization of the lamprophyres, together with systematic variations of Na2O vs SiO2, K2O, CaO, Ba, Rb, Cs, Pb, Sr, Tl, and Zn, and possibly the removal of F. The geochemical and geochronological data support an orogenic geochemical affinity, in accordance with the transitional tectonic regime between Variscan compression/transpression and post-collisional transtension/extension, related to the fragmentation of Pangea and thinning of the lithosphere. The lamprophyre dykes studied could represent the youngest pulse of Variscan orogenic magmatism and, therefore, mark its end in NE Iberia before the onset of the generalized Triassic extension.
|Number of pages||24|
|Publication status||Published - 26 Jul 2021|
- Calc-alkaline lamprophyre
- Catalan Coastal Ranges
- Les Guilleries Massif
- Post-collisional dykes
- Sr-Nd isotopes
- Variscan Orogeny
FingerprintDive into the research topics of 'The enriched Variscan lithosphere of NE Iberia: data from post-collisional Permian calc-alkaline lamprophyre dykes of Les Guilleries'. Together they form a unique fingerprint.
- 1 Active
ORIGIN, MOBILIY AND CONCENTRATION OF RARE EARTHS ELEMENTS IN VARISCAN IBERIAN ROCKS OF THE CENTRAL SYSTEM AND CATALAN COASTAL RANGES
Corbella, M., Cardellach Lopez, E., Casado Aijon, G., Corral Calleja, I., Corral Calleja, I., Leoz Munte, G., Martinez Fernandez, F. J., Mayans Font, M., Navarro Ciurana, D., Galan Garcia, G., Reche Estrada, J., Aguilar Gil, C., Aguilar Gil, C., CULI VERDAGUER, L., GONZALEZ LAGUNA, R., Martín-Crespo, T., Vindel Catena, E. & Mellado Ilabaca, E.
1/06/20 → 31/05/23
Project: Research Projects and Other Grants