Piton de l. a. Fournaise and Karthala are either guard volcanoes within the southwest Indian Ocean. This book summarizes the paintings performed on those very energetic basaltic volcanoes. Piton de l. a. Fournaise has a protracted historical past of clinical study and tracking, with many information amassed in the course of contemporary eruptions. it's one in all the main studied volcanoes on this planet. The paintings provided during this monograph contains geological, geophysical, geochemical and petrological points, but additionally reports on actual geography, traditional risks and the sociological and behavioural approaches.'
The Karthala volcano will be much less renowned, however it serves as an engaging comparability to Piton de los angeles Fournaise. even if positioned as regards to the volcanoes of Hawaii, it differs from them by way of its extra alkaline magmas and not more widespread task. It was once additionally monitored for greater than 25 years, generating remarkable eruptions in recent times.
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Extra info for Active Volcanoes of the Southwest Indian Ocean: Piton de la Fournaise and Karthala (Active Volcanoes of the World)
The ridges and seamounts protrude from a flat seafloor covered by a few hundred meters of sediments. The morphology of their flanks, their sediment cover and the coating of the dredged samples by Mn-oxides (Fretzdorff et al. 1998) indicate that they are old seamounts. The seismic data show that the sedimentary sequence is deformed and disrupted in several places (de Voogd et al. 2009). The *50°N and *90°N elongation of the ridges is signiﬁcantly different from that of the transform faults (*35–40°N).
Indian Ocean, AAPG, Cape town Schettino A, Scotese CR (2005) Apparent polar wander paths for the major continents (200 Ma to the present day): a palaeomagnetic reference frame for global plate tectonic reconstructions. Geophys J Int 163:727– 759. x Sleep NH (2002) Ridge-crossing mantle plumes and gaps in tracks. Geochem Geophys Geosyst 3(12). doi:10. 1029/2001GC000290 Small C (1995) Observations of ridge/hot spot interactions in the Southern Ocean. J Geophys Res 100:17931–17946 Smith W, Sandwell D (1997) Global sea floor topography from satellite altimetry and ship depth soundings.
Therefore, they do not generate magnetic anomalies comparable in amplitude to that of massive volcanic constructions. The gravity models (Gailler and Lénat 2010) show that the flanks have an overall low density, also compatible with mass wasting and sedimentary deposits. The model presented by Le Friant et al. (2011) is slightly different in that it suggests that the submarine flanks around Piton des Neiges volcano are dominated by the spreading of the ediﬁce. This would imply magnetic and gravity signatures (magnetic anomalies created by coherent, though rotated, blocks and higher density than that of mass wasting deposits and sediments) that are not apparently observed, although more detailed analyses would be necessary to reject or reﬁne this hypothesis.
Active Volcanoes of the Southwest Indian Ocean: Piton de la Fournaise and Karthala (Active Volcanoes of the World)