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 517 KOGARKO, L. N. Alkaline rocks of the eastern...transitional basalts, and these typically form major volcano complexes and have associated felsic magmas. Such...geology, petrology and geochemistry of Caldeira volcano, Graciosa, Azores, and its bearing on contemporaneous...(unpublished). - - , J. G. & BAILEY, D. K. 1982. Caldeira volcano, Graciosa, Azores: Progress Report. J. geol. Soc...Province) c + 4.3 to + 34.1 0.056-1.28 Fiji - 13.4 -France (Massif Central) - 14.2 to 0 0.153-1.225 French
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...alkali basalts that have erupted at later stages of volcano development. To show how this can be applied, the...accelerates the melt upward; vesiculation in a volcano vent therefore promotes lava fountaining at the
