INSTITUTO DE LAS CULTURAS
Unidad Ejecutora - UE
congresos y reuniones científicas
One of the largest Holocene eruptions identified in the Cerro Blanco Volcanic Complex, Central Andes
ALEJANDRO RODRÍGUEZ GONZÁLEZ; AGUSTIN LOBO; FERNANDE-TURIEL, JOSE LUIS; NORMA RATTO; FRANCISCO J. PÉREZ TORRADO; MARTA REJAS
Congreso; European Geosciences Union General Assembly 2020 (EGU2020), Online por coronavirus; 2020
European Geosciences Union General Assembly 2020 (EGU2020), Online por coronavirus
The major eruption of the Cerro Blanco Volcanic Complex (CBVC), in the Central Volcanic Zone of the Andes, NW Argentina, dated at 4410?4150 a cal BP, was investigated confirming that is one the major Holocene eruptive events in the world (Fernandez-Turiel et al., 2019). Identification of pre?, syn?, and post?caldera products of CBVC allowed us to estimate the distribution of the Plinian fallout during the paroxysmal syn?caldera phase of the eruption. Results provide evidence for a major rhyolitic explosive eruption that spread volcanic deposits over an area of about 500,000 km2, accumulating >100 km3 of tephra (bulk volume). This last value exceeds the lower threshold of Volcanic Explosive Index (VEI) of 7. Ash-fall deposits mantled the region at distances >400 km from source and thick pyroclastic-flow deposits filled neighbouring valleys up to several tens of kilometres from the vent. Financial support was provided by the ASH and QUECA Projects (MINECO, CGL2008-00099 and CGL2011-23307). We acknowledge the assistance in the analytical work of labGEOTOP Geochemistry Laboratory (infrastructure co-funded by ERDF-EU Ref. CSIC08-4E-001) and DRX Laboratory (infrastructure co?funded by ERDF?EU Ref. CSIC10-4E-141) (J. Ibañez, J. Elvira and S. Alvarez) of ICTJA-CSIC, and EPMA and SEM Laboratories of CCiTUB (X. Llovet and J. Garcia Veigas). This study was carried out in the framework of the Research Consolidated Groups GEOVOL (Canary Islands Government, ULPGC) and GEOPAM (Generalitat de Catalunya, 2017 SGR 1494).