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Article Dans Une Revue Bulletin of Volcanology Année : 2015

Volcanic evolution of central Basse-Terre Island revisited on the basis of new geochronology and geomorphology data

J. Ricci
  • Fonction : Auteur
Pierre Lahitte

Résumé

Twenty-six new and seven previous K-Ar ages obtained on groundmass separates for samples from the Axial Chain massif (Guadeloupe, F.W.I.), associated with geomorphological investigations, allow us to propose a new model of the volcanic evolution of the central part of Basse-Terre Island. The Axial Chain is composed of four edifices, Moustique, Matéliane, Capesterre, and Icaque mounts, showing coeval activity from 681±12 to 509±10 ka, which contradicts a previous hypothesis that flank collapse affected them successively. Our geomorphological reconstruction shows that the Axial Chain can be considered as a single large volcano, named the Southern Axial Chain volcano (SCA), rather than a succession of several smaller volcanoes. It raises questions regarding the formation of a large depression within the SCA volcano, prior to the construction of the Sans-Toucher volcano between 451± 13 and 412±8 ka. Given presently available evidence, a slump affecting the western part of the SCA volcano is the most probable scenario to reconcile the complete age dataset and the present-day morphology of central Basse-Terre. Finally, our study shows that the SCA volcano had a post-activity volume of 90 km 3 , implying a construction rate of 0.5 km 3 /kyr. This value strongly constrains interpretations of magma generation processes throughout the Lesser Antilles arc.
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Dates et versions

hal-04420486 , version 1 (26-01-2024)

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J. Ricci, Xavier Quidelleur, Pierre Lahitte. Volcanic evolution of central Basse-Terre Island revisited on the basis of new geochronology and geomorphology data. Bulletin of Volcanology, 2015, 77 (10), pp.84. ⟨10.1007/s00445-015-0970-7⟩. ⟨hal-04420486⟩
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