1GR - Géosciences Rennes (Bâtiment 15 - Université de Rennes 1 - Campus de Beaulieu -263 Av du général Leclerc- CS 74205 - 35042 Rennes Cedex - France - France)
Abstract : A Jurassic extensional detachment associated with carbonated serpentinites and basalts is preserved at Falotta (Platta nappe, southeastern Switzerland). Structural data indicate that fluid circulation occurred during late increments of extension along the detachment plane at the contact between serpentinites and basalts. The homogeneity of the isotopic signatures (δ18O ~16‰ and δ13C centered on 0‰–1‰) can be best explained by a single, sudden seawater-derived carbonation event at temperatures of ~100 °C. Carbonation was focused in the high-permeability zone along the detachment. Our model yields new insights for carbonation processes related to mantle exhumation.
https://hal-insu.archives-ouvertes.fr/insu-01987341
Contributor : Isabelle Dubigeon
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Submitted on : Monday, January 21, 2019 - 9:52:17 AM
Last modification on : Friday, May 10, 2019 - 1:54:18 PM
Rémi Coltat, Philippe Boulvais, Yannick Branquet, J. Collot, M.E. Epin, et al.. Syntectonic carbonation during synmagmatic mantle exhumation at an ocean-continent transition. Geology, Geological Society of America, 2019, 47 (2), pp.183-186. ⟨10.1130/G45530.1⟩. ⟨insu-01987341⟩
