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

摘要

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. (C) 2018 Elsevier B.V. All rights reserved.