Download Active Volcanoes of the Southwest Indian Ocean: Piton de la by Patrick Bachelery, Jean-François Lenat, Andrea Di Muro, PDF

By Patrick Bachelery, Jean-François Lenat, Andrea Di Muro, Laurent Michon

Piton de los angeles Fournaise and Karthala are either defend volcanoes within the southwest Indian Ocean. This book summarizes the paintings performed on those very energetic basaltic volcanoes. Piton de los angeles Fournaise has an extended historical past of clinical examine and tracking, with many information amassed in the course of contemporary eruptions. it really is one of the main studied volcanoes on the earth. The paintings awarded during this monograph contains geological, geophysical, geochemical and petrological points, but additionally reports on actual geography, average risks and the sociological and behavioural approaches.'

The Karthala volcano might be much less popular, however it serves as an engaging comparability to Piton de l. a. Fournaise. even if positioned as regards to the volcanoes of Hawaii, it differs from them by way of its extra alkaline magmas and no more common job. It used to be additionally monitored for greater than 25 years, generating awesome eruptions in fresh years.

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Extra resources for Active Volcanoes of the Southwest Indian Ocean: Piton de la Fournaise and Karthala

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Two very large seamounts are observed in this area. At the latitude of La Réunion, a less focussed *N90 ridge extends from near the Mahanoro-Wilshaw fracture zone and disappears beneath the western submarine flank of La Réunion. On the other side of the island, a large elongated seamount is in line with the *90°N ridge. Along this line, we also observe a seamount protruding from the western flank of La Réunion. It has been studied by Oehler et al. (2008) and named Sonne Seamount. The ridges and their sedimentary environment have been studied by Fretzdorff et al.

The large range of gravity values in this area of the map is related to the presence of the islands and of large seamounts for the positive values, and to the presence of sedimentary basins along transform faults and around Mauritius for the negative ones. Note that to the SW of La Réunion (and further to the S and SE) there are positive values that suggest poor isostatic compensation. The load of Mauritius has induced a flexure of the lithosphere which has been filled by sediments. This is well documented by the gravity and seismic data acquired during the FOREVER cruise in 2006 (de Voogd et al.

Smietana (2011) suggests that, as in the case of Piton des Neiges (Kluska 1997; Upton and Wadsworth 1972), these plagioclase-rich basalts represent the transition from a basaltic shield building stage to a more differentiated stage. Accordingly, the Roches Pintades Series of Piton de la Fournaise would more likely mark the evolution of a pre-existing 39 basaltic shield than represent the early stage of Piton de la Fournaise volcano. Considering this body of information, several authors have tried to construct a model of evolution that includes the construction of Les Alizés volcano (Lénat et al.

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