Arc-related metamorphism in the Guadeloupe archipelago (Lesser Antilles active island arc): First report and consequences

Chrystele Verati (1) , Jean-Marc Lardeaux (1) , Alexiane Favier (1) , Michel Corsini (1) , Melody Philippon (2) , Lucie Legendre (2)

1 GEOAZUR 7329 - Géoazur
2 Géosciences Montpellier

We unravel for the first time the expression of a low-grade metamorphic event affecting the deepest exposures of the Guadeloupe Island, central Lesser Antilles, Caribbean plate. The work offers a novel insight for the presence of young (<3 Ma) sub-greenschist facies metamorphism in the Lesser Antilles active arc and is consistent with the elevated geothermal gradients measured for the arc axis regionally. Quantitative pressure-temperature constraint (i.e. pseudosection) for this metamorphism as well as fluid/rock ratios are discussed. This paper offers the first report of “ductile” deformation mechanisms (i.e. pressure-solution) operating at shallow crustal levels of the Antilles volcanic arc system.

Mots clés: Low-grade metamorphism pressure-solution; Lesser Antilles active arc; Basse-Terre of Guadeloupe

Domaines: Pétrographie

Chrystele Verati, Jean-Marc Lardeaux, Alexiane Favier, Michel Corsini, Melody Philippon, et al.. Arc-related metamorphism in the Guadeloupe archipelago (Lesser Antilles active island arc): First report and consequences. Lithos, 2018, 320, pp.592-598. ⟨10.1016/j.lithos.2018.08.005⟩. ⟨hal-01976523⟩