Geology

Active Volcanoes of the Southwest Indian Ocean: Piton de la

Piton de l. a. Fournaise and Karthala are either safeguard volcanoes within the southwest Indian Ocean. This book summarizes the paintings performed on those very lively basaltic volcanoes. Piton de los angeles Fournaise has a protracted historical past of clinical study and tracking, with many information accrued in the course of contemporary eruptions. it truly is one among the main studied volcanoes on this planet. The paintings offered during this monograph comprises geological, geophysical, geochemical and petrological elements, but additionally reviews on actual geography, normal risks and the sociological and behavioural approaches.'

The Karthala volcano should be much less renowned, however it serves as an engaging comparability to Piton de l. a. Fournaise. even if located on the subject of the volcanoes of Hawaii, it differs from them via its extra alkaline magmas and not more widespread task. It was once additionally monitored for greater than 25 years, generating outstanding eruptions lately.

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Additional resources for Active Volcanoes of the Southwest Indian Ocean: Piton de la Fournaise and Karthala (Active Volcanoes of the World)

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G. Minshull and Charvis 2001; Watts 1994; Watts and ten Brink 1989) and suggests a dynamic equilibrium where positive buoyancy of the plume would contribute to the dynamic support of the load of La Réunion. This had been suggested by Bonneville et al. (1997) and Lénat et al. (2009b). The gravity data support this absence of flexure (Lénat 2016, Chap. 2). On the base of this geometry of the ocean floor, de Voogd et al. (1999) estimate the subaerial part of La Réunion as being only 3 % by volume of the whole volcanic system.

2009). On the basis of such arguments, it became indisputable to some authors (Lénat et al. 2001; Malengreau et al. 1999; Rançon et al. ). Their main argument was that such intrusive complexes usually develop during the edification of shield volcanoes, as is the case, for example, for Piton des Neiges volcano (see above) and the Hawaiian volcanoes (Kauahikaua et al. 2000; Ryan 1987). The presence of negative magnetic anomalies (Fig. 78 Ma) are present at fairly shallow depths beneath the younger formations of Piton de la Fournaise and its submarine flank (Gailler and Lénat 2012).

The evolution of Les Alizés volcano is still more speculative after this period. , the summit of the edifice could have reached at least 1500–2500 m in elevation if we compare to similar sites such as Piton des Neiges or Hawaii (Ryan 1987). With no remnants of such an edifice above about 1000–1200 m in elevation (“Roches Pintades”), it must be assumed that there were catastrophic destruction processes involved. Merle et al. (2010) and Oehler et al. (2008) have inferred that large flank landslides were responsible for the massive destruction of the superstructures of Les Alizés volcano.

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