Search results for "Scoria"

showing 3 items of 13 documents

Correlation of welded ignimbrites on Pantelleria (Strait of Sicily) using paleomagnetism

2011

Although the oldest volcanic rocks exposed at Pantelleria (Strait of Sicily) are older than 300 ka, most of the island is covered by the 45–50 ka Green Tuff ignimbrite, thought to be related to the Cinque Denti caldera, and younger lavas and scoria cones. Pre-50 ka rocks (predominantly rheomorphic ignimbrites) are exposed at isolated sea cliffs, and their stratigraphy and chronology are not completely resolved. Based on volcanic stratigraphy and K/Ar dating, it has been proposed that the older La Vecchia caldera is related to ignimbrite Q (114 ka), and that ignimbrites F, D, and Z (106, 94, and 79 ka, respectively) were erupted after caldera formation. We report here the paleomagnetic direc…

geographyPaleomagnetismgeography.geographical_feature_categorySettore GEO/07 - Petrologia E PetrografiaGeochemistrySettore GEO/08 - Geochimica E VulcanologiaVolcanic rockVolcanoStratigraphyGeochemistry and PetrologyBrecciaMagmaCalderaScoriaPantelleria . Ignimbrite . Caldera formation . Paleomagnetism . Paleosecular variation of the geomagnetic fieldGeomorphologyGeologyBulletin of Volcanology
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Volcanic Lakes in Africa: The VOLADA_Africa 2.0 Database, and Implications for Volcanic Hazard

2021

Volcanic lakes pose specific hazards inherent to the presence of water: phreatic and phreatomagmatic eruptions, lahars, limnic gas bursts and dispersion of brines in the hydrological network. Here we introduce the updated, interactive and open-access database for African volcanic lakes, country by country. The previous database VOLADA (VOlcanic LAke DAta Base, Rouwet et al., Journal of Volcanology and Geothermal Research, 2014, 272, 78–97) reported 96 volcanic lakes for Africa. This number is now revised and established at 220, converting VOLADA_Africa 2.0 in the most comprehensive resource for African volcanic lakes: 81 in Uganda, 37 in Kenya, 33 in Cameroon, 28 in Madagascar, 19 in Ethiop…

geographyVolcanic hazardsgeography.geographical_feature_categoryRiftDatabaseLake NyosScienceLimnologyQVolcanismmaarcomputer.software_genreMaarhazard assessmentVolcanoAfricaAfrica volcanic lakes maar Lake Nyos database hazard assessmentPhreatomagmatic eruptionGeneral Earth and Planetary SciencesScoriacomputervolcanic lakesdatabaseFrontiers in Earth Science
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Pantelleria island (Strait of Sicily): volcanic history and geomorphological landscape

2017

Pantelleria is a volcanic island located in the Strait of Sicily, 95 km far from the Sicilian coastline and 67 km from Cape Bon (Tunisia). The volcanological history of the island begins approximately 324 ka BP and the last eruptive event was a submarine eruption that occurred on 1891 A.D. Eruptive activity was characterized by seven very intense explosive events, the latest being the Green Tuff (44 ka). They have all produced ignimbrite sheets that covered large sectors of the island. The landscape of the island mirrors the variety of the eruptive styles and their interplay with volcano-tectonics. The most evident geomorphological features are represented by: (i) the mantle-like distributi…

geographygeography.geographical_feature_categoryVolcanic island Ignimbrites Caldera Pantelleria Strait of SicilySettore GEO/04 - Geografia Fisica E GeomorfologiaSettore GEO/07 - Petrologia E PetrografiaLava domelanguage.human_languagePaleontologySubmarine eruptionRockfallLava fieldVolcanolanguageCalderaScoriaGeomorphologySicilianGeology
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