pyroxenes in the Tertiary alkali basalts of the Cantal massif (French Massif Central) S. Pilet1 , J. Hernandez1...volcaniques, Universite P. et M. Curie, Paris, France Received February 2, 2001; revised version accepted...rocks of many magmatic alkaline provinces. In the Cantal massif, green-core pyroxenes occur in nearly all...percolation and the formation of GCPX observed in Cantal basalts. We propose that GCPX crystallized in a...and pyroxenes observed in the phonolites of the Cantal massif. Amphibolitic siliceous metasomatic veins
and Quaternary volcanism in the Massif Central, France Hilary Downes S U M M A R Y : Continental alkaline...magma series are present: a silica-undersaturated basanite-tephrite-phonolite series and an alkali basal...Deves) and two central volcanoes (Mont-Dore and Cantal). Maars and diatremes are common, indicating interaction...Oligocene graben system. Subsequently the central volcanoCantal (112.5 Ma) and the plateau-forming fissure...Escandorgue and the eruption of the second central volcano Mont-Dore. The youngest activity (Recent) is in
undersaturated alkaline volcanics, Cantal, Massif Central, France H. DOWNES Department of Geology, Birkbeck...mixing in the Puy Griou/Griounot area of the Cantal volcano (10 3 Ma). Petrographic evidence for injection...KEYWORDS:magma mixing, alkaline volcanics, Massif Central, France. Introduction IT is now widely accepted that magma...dominated by two late Tertiary central volcanoes, Cantal (10-3 Ma) and Mont Dore (2.5-0.25 Ma). In these...rhyolite magmas are well-known from the Mont Dore volcano and the Chaine des Puys. It is considered that
and Quaternary volcanism in the Massif Central, France 517 KOGARKO, L. N. Alkaline rocks of the eastern...undersaturated parental magmas represented by basanite and nephelinite will produce undersaturated derivatives...undersaturated parental magmas represented by basanite and nephelinite will produce undersaturated derivatives...transitional basalts, and these typically form major volcano complexes and have associated felsic magmas. Such...are present in other magma associations, such as basanite-phonolite and nephelinite-nephelinitic phonolite
Mineralogical Society of America (Fig. 6.6), Montserrat Volcano Observatory (Fig. 7.4a and the front cover image)...previously erupted products the hazard presented by a volcano to surrounding communities; • investigating magma...chamber that originally lay 5 km below an active volcano (but whose contents – or erupted products – are...minor nepheline (+ olivine → alkali basalt1) basanite augite + calcic plag + foid (>10%) + olivine...phonotephrite trachyandesite 8 tephrite (ol < 10%) basanite (ol > 10%) 6 trachybasalt basaltic trachyandesite
indicated) Front page of cover: Overview of the Ruapehu volcano in the Central North Island of New Zealand. Tama...New Zealand. Lower: Overview of the Mt Ngauruhoe volcano from the north, Taupo Volcanic Zone, New Zealand...volcanic rocks from previous eruptions of the same volcano (Plate II, 2). In the CAS and WRIGHT (1987) terminology...pyroclastic flows inferred from ignimbrite at Lascar Volcano, Chile. — Journal of Volcanology and Geothermal...flows from summit dome activity of Citlaltepetl volcano, Eastern Mexico. — Journal of Volcanology and Geothermal
Typhon is buried under Etna volcano. Whenever the giant stirs, the volcano erupts violently. Eighteenth...Science, New Zealand Stephen R. McNutt Alaska Volcano Observatory and University of Alaska Fairbanks...Hazard from Lahars and Jökulhlaups Synthesis of Volcano Monitoring 973 1121 John B. Murray, Hazel Rymer...McNutt Impacts of Eruptions on Human Health Volcano Warnings Volcanic Crises Management Peter J. Baxter...Related Phreatomagmatic Eruptions Synthesis of Volcano Monitoring 495 1165 Volcanic Lakes Volcanic Materials
