Initial sub-aerial volcanic activity along the central Lesser Antilles inner arc: New K–Ar ages from Les Saintes volcanoes

Zami, Fabienne; Quidelleur, Xavier; Ricci, Julia; Lebrun, Jean‐Frédéric; Samper, A.

doi:10.1016/j.jvolgeores.2014.09.011

Cited by 18 publications

(38 citation statements)

References 36 publications

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“…To the east, Guadeloupe consists of Grande-Terre, La Désirade, Petite-Terre and Marie-Galante Islands, on which early Pliocene-middle Pleistocene limestones were deposited upon volcanic and/or sedimentary crust (Bouysse and Garrabé, 1984;Andreieff et al, 1987;Bouysse et al, 1993;Cornée et al, 2012;Lardeaux et al, 2013;Münch et al, 2013Münch et al, , 2014. To the west, Guadeloupe is composed of Basse-Terre and Les Saintes Islands, which correspond to the inner active arc (Andreieff et al, 1987;Westercamp, 1988;Carlut et al, 2000;Mathieu et al, 2013;Zami et al, 2014;Verati et al, 2016). Basse-Terre consists of a cluster of volcanic complexes, frequently called "volcanic chains", with from north to south (Samper et al, 2007): the oldest Basal Complex characterized by a 3 to 2 Ma aged volcanism, the Septentrional Chain between 1.8 to 1.1 Ma, the Axial Chain active from 1 to 0.4 Ma, the Grande Découverte -Trois Rivières Complex (0.2 Ma-recent) including the present-day active La Soufrière volcano (Boudon et al, 1987(Boudon et al, , 2008, and the Monts Caraïbes Chain built at around 0.6-0.4 Ma (Blanc, 1983;Ricci et al, 2017).…”

Section: Guadeloupe In the Lesser Antilles Geological Contextmentioning

confidence: 99%

Tectono-metamorphic evolution of shallow crustal levels within active volcanic arcs. Insights from the exhumed Basal Complex of Basse-Terre (Guadeloupe, French West Indies)

Favier

Lardeaux

Legendre

et al. 2019

BSGF - Earth Sci. Bull.

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In order to decipher the tectono-metamorphic evolution of shallow crustal levels of the active volcanic arc of the Guadeloupe archipelago (Lesser Antilles) we present new geochemical, geochronological, mineralogical and structural investigations of the so-called Basal Complex, the oldest and most eroded volcanic complex of Basse-Terre in Guadeloupe. Based on geochemical and mineralogical criteria we propose an updated geological map of this northern area of Basse-Terre. Using 40 Ar-39 Ar geochronology we demonstrate first that the eroded "Gros Morne" of Deshaies belong to the Basal Complex, and second that this complex is characterized by 4.3 to 2 Ma old volcanism. Structural analysis reveals a long-lived deformation history with the development through time of N80-N100 schistose zones; N110-N140 and N160-N10 oriented hydrothermal breccias and N140-N150 brittle normal faults. The boundary between the Basal Complex and the southernmost Septentrional Chain corresponds to a series of faults with N 150°and N 50°main directions. Detailed mineralogical and petrological investigations, including thermodynamic modeling, allow the identification of three phases of post-magmatic mineralogical transformations with first a high-temperature stage under Greenschist to sub-Greenschist facies conditions (0.6-2 kbar for 250-300°C), a re-equilibration under Zeolite facies conditions and finally a sub-surface alteration. The consistency between P-T conditions of metamorphism and the present day measured geothermal gradient demonstrates that the metamorphic pattern is the record of hydrothermal fluids circulation during building and cooling of the Lesser Antilles magmatic arc. The tectono-metamorphic evolution recognized in the Basal Complex enables us to propose a conceptual model for heat and fluid transport within shallow crustal levels of the Guadeloupe active volcanic arc.Keywords: arc-related metamorphism / Lesser Antilles / Guadeloupe / Basal Complex / tectono-metamorphic evolution / hydrothermal fluids Résumé -Évolution tectono-métamorphique des niveaux superficiels de la croûte dans les arcs volcaniques actifs. Exemple du Complexe Basal exhumé de Basse-Terre (Guadeloupe, Antilles françaises). Afin de décrypter l'évolution tectono-métamorphique des niveaux crustaux peu profonds de l'arc volcanique actif de l'archipel de la Guadeloupe (Petites Antilles), nous présentons de nouvelles investigations géochimiques, géochronologiques, minéralogiques et structurales du Complexe Basal, le plus ancien et le plus érodé des complexes volcaniques de Basse-Terre en Guadeloupe. Sur la base de critères géochimiques et minéralogiques, nous proposons une carte géologique actualisée de cette zone nord de la Basse-Terre. En utilisant la géochronologie 40 Ar-39 Ar nous démontrons d'abord que le « Gros Morne »

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Section: Guadeloupe In the Lesser Antilles Geological Contextmentioning

confidence: 99%

Tectono-metamorphic evolution of shallow crustal levels within active volcanic arcs. Insights from the exhumed Basal Complex of Basse-Terre (Guadeloupe, French West Indies)

Favier

Lardeaux

Legendre

et al. 2019

BSGF - Earth Sci. Bull.

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show abstract

“…The ancient K-Ar data were obtained on whole rock, whereas the new ones were made on groundmass using the Cassignol-Gillot technique [Zami et al, 2014]. Furthermore, the previous K-Ar ages from Jacques et al [1984] were often discordant with the new K-Ar ages from Zami et al [2014] obtained for the same formation. Therefore, we consider only the new K-Ar ages from Zami et al [2014] suggesting that the volcanism in Les Saintes archipelago was not continuous as previously inferred.…”

Section: Introductionmentioning

confidence: 97%

“…2), and consists of typical calc-alkaline volcanic rocks from insular arcs, with ages ranging from 4.7 ± 0.35 Ma to 0.64 ± 0.10 Ma Jacques and Maury, 1988]. However, the latest geochronological study from Zami et al [2014], demonstrates that some previous K-Ar ages [Jacques and Maury, 1988] were not accurate especially with respect to the technique and minerals used for the analyses. The ancient K-Ar data were obtained on whole rock, whereas the new ones were made on groundmass using the Cassignol-Gillot technique [Zami et al, 2014].…”

Section: Introductionmentioning

confidence: 99%

“…However, the latest geochronological study from Zami et al [2014], demonstrates that some previous K-Ar ages [Jacques and Maury, 1988] were not accurate especially with respect to the technique and minerals used for the analyses. The ancient K-Ar data were obtained on whole rock, whereas the new ones were made on groundmass using the Cassignol-Gillot technique [Zami et al, 2014]. Furthermore, the previous K-Ar ages from Jacques et al [1984] were often discordant with the new K-Ar ages from Zami et al [2014] obtained for the same formation.…”

Section: Introductionmentioning

confidence: 99%

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Tectonic evolution of Les Saintes archipelago (Guadeloupe, French West Indies): relation with the Lesser Antilles arc system

Vérati

Mazabraud²,

Lardeaux

et al. 2016

Bulletin De La Société Géologique De France

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International audienceIn this paper, we provide the first structural map of Les Saintes archipelago (Guadeloupe, Lesser Antilles). The finite strain pattern displays four families of fault systems characterized by their statistical structural orientations: N000-N020, N050-N070, N090-N110 and N130-N140 trending fault systems. Our onshore results thus underline a fault network much more complex than the one depicted by the previous offshore geophysical investigations around Les Saintes archipelago, which show only N120-N150 trending system. According to the available K-Ar dating of the volcanic rocks and the relative chronology of the faults defined in the field, we determine the deformation history in Les Saintes islands since the last 3 Ma. The four highlighted trending fault systems are already active since the Pliocene and are consistent with the present-day extensional tectonics in the Guadeloupe archipelago compatible with the reactiva-tion of inherited structures at the active arc scale. We interpret the tectonic evolution of Les Saintes islands as the result of interplay between subduction of aseismic ridges (Tiburon and Barracuda ridges) and oblique convergence. Furthermore , we recognized an exhumed geothermal paleo-system in Terre-de-Haut island which is a good analogue of the present-day active Bouillante geothermal system. Its duration is estimated at 400 k.y. during the Pliocene

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“…In Les Saintes, Zami et al . [] showed that the volcanic activity lasted between ∼3 and 2 Ma in Terre‐de‐Haut and resumed in Terre‐de‐Bas during a short period of time, around 0.9 Ma. The Roseau volcano is then probably younger than 3 Ma, implying a minimum slip rate of the order of 0.15 mm/yr on the Roseau main fault (for a total offset of U2 and U1 equal to 450 m).…”

Section: Discussionmentioning

confidence: 99%

Interactions between active faulting, volcanism, and sedimentary processes at an island arc: Insights from Les Saintes channel, Lesser Antilles arc

Leclerc

Feuillet

Deplus

2016

Geochem Geophys Geosyst

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International audienceNew high-resolution marine geophysical data allow to characterize a large normal fault system in the Lesser Antilles arc, and to investigate the interactions between active faulting, volcanism, sedimenta-ry, and mass-wasting processes. Les Saintes fault system is composed of several normal faults that form a 30 km wide half-graben accommodating NE-SW extension. It is bounded by the Roseau fault, responsible for the destructive Mw 6.3 21 November 2004 earthquake. The Roseau fault has been identified from the island of Basse-Terre to Dominica. It is thus 40 km long, and it could generate Mw 7 earthquakes in the future. Several submarine volcanoes are also recognized. We show that the fault system initiated after the main volcanic construction and subsequently controls the emission of volcanic products. The system propagates southward through damage zones. At the tip of the damage zones, several volcanic cones were recently emplaced probably due to fissures opening in an area of stress increase. A two-way interaction is observed between active faulting and sedimentary processes. The faults control the development of the main turbiditic system made of kilometer-wide canyons, as well as the location of sediment ponding. In turn, erosion and sedimentation prevent scarp growth at the seafloor. Faulting also enhances mass-wasting processes. Since its initiation, the fault system has consequently modified the morphologic evolution of the arc through perturbation of the sedimentary processes and localization of the more recent volcanic activity

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Initial sub-aerial volcanic activity along the central Lesser Antilles inner arc: New K–Ar ages from Les Saintes volcanoes

Cited by 18 publications

References 36 publications

Tectono-metamorphic evolution of shallow crustal levels within active volcanic arcs. Insights from the exhumed Basal Complex of Basse-Terre (Guadeloupe, French West Indies)

Tectono-metamorphic evolution of shallow crustal levels within active volcanic arcs. Insights from the exhumed Basal Complex of Basse-Terre (Guadeloupe, French West Indies)

Tectonic evolution of Les Saintes archipelago (Guadeloupe, French West Indies): relation with the Lesser Antilles arc system

Interactions between active faulting, volcanism, and sedimentary processes at an island arc: Insights from Les Saintes channel, Lesser Antilles arc

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