Keanu Loiseau, Charles Aubourg, Valentin Petit, Sébastien Bordes, Nicolas Lefeuvre, Eric Thomas, Guilhem Hoareau, Isabelle Moretti

H 2 generation and heterogeneity of the serpentinization process at all scales: Turon de Técouère lherzolite case study, Pyrenees (France)

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Hydrogen (H 2 ) emanations have been recognized in the south and north of the Pyrenees fold belt, within its two forelands. The proposed source is a mantle wedge rather near the surface which is currently undergoing serpentinization. The migration pathway seems to be the deep rooting faults since the H 2 content is higher where the faults reach the surface. The zone of current H 2 generation is around 10 km deep. It is evident from filed observations that kilometric pieces of mantle have been incorporated in the thrusts and outcrop in a few areas along the mountain belt. We studied the Turon de Tecouère, one of this mantle-derived body, using various field and laboratory tools focusing on the characterization of its alteration, the degree of serpentinization and its heterogeneity at the kilometer-scale. Accordingly, magnetic field and magnetic susceptibility were mapped, classical optical observations and 3D scan of some samples were performed and H 2 soil gas content mapping has been carried out. The results show heterogenous serpentinization from 3% to 62% at km to the µm scale. Since, the temperature and burial history are the same overall the Turon de Tecouère, these factors were not sufficient to characterize the level of transformation in the H 2 generating rock. The soil gas measurements show current H 2 emanations in and around the Turon de Tecouère. Near surface H 2 production of this mantle body is unlikely in the current knowledge of the H 2 generation kinetics. To explain these emanations, we favor a preferential migration pathway within the Turon root and the surrounding faults. Thematic collection: This article is part of the Hydrogen as a future energy source collection available at: https://www.lyellcollection.org/topic/collections/hydrogen

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