D. Bonnemains
Institut de Physique du Globe de Paris
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Featured researches published by D. Bonnemains.
Geochemistry Geophysics Geosystems | 2017
J. Escartin; Catherine Mével; Sven Petersen; D. Bonnemains; Mathilde Cannat; Muriel Andreani; Nico Augustin; Antoine Bezos; Valérie Chavagnac; Y. Choi; Marguerite Godard; Kristian Agasøster Haaga; C. Hamelin; Benoit Ildefonse; John Jamieson; Barbara E. John; T. Leleu; Christopher J. MacLeod; Miquel Massot-Campos; Paraskevi Nomikou; J.-A. Olive; M. Paquet; C. Rommevaux; Marcel Rothenbeck; Anja Steinführer; Masako Tominaga; Lars Triebe; Ricard Campos; Nuno Gracias; Rafael Garcia
Microbathymetry data, in situ observations, and sampling along the 138200N and 138200N oceanic core complexes (OCCs) reveal mechanisms of detachment fault denudation at the seafloor, links between tectonic extension and mass wasting, and expose the nature of corrugations, ubiquitous at OCCs. In the initial stages of detachment faulting and high-angle fault, scarps show extensive mass wasting that reduces their slope. Flexural rotation further lowers scarp slope, hinders mass wasting, resulting in morphologically complex chaotic terrain between the breakaway and the denuded corrugated surface. Extension and drag along the fault plane uplifts a wedge of hangingwall material (apron). The detachment surface emerges along a continuous moat that sheds rocks and covers it with unconsolidated rubble, while local slumping emplaces rubble ridges overlying corrugations. The detachment fault zone is a set of anostomosed slip planes, elongated in the alongextension direction. Slip planes bind fault rock bodies defining the corrugations observed in microbathymetry and sonar. Fault planes with extension-parallel stria are exposed along corrugation flanks, where the rubble cover is shed. Detachment fault rocks are primarily basalt fault breccia at 138200N OCC, and gabbro and peridotite at 138300N, demonstrating that brittle strain localization in shallow lithosphere form corrugations, regardless of lithologies in the detachment zone. Finally, faulting and volcanism dismember the 138300N OCC, with widespread present and past hydrothermal activity (Semenov fields), while the Irinovskoe hydrothermal field at the 138200N core complex suggests a magmatic source within the footwall. These results confirm the ubiquitous relationship between hydrothermal activity and oceanic detachment formation and evolution.
Geochemistry Geophysics Geosystems | 2016
D. Bonnemains; Julie Carlut; J. Escartin; Catherine Mével; M. Andreani; Baptiste Debret
We compare magnetic properties of 58 variably serpentinized peridotites from three ophiolite complexes (Pindos, Greece; Oman; Chenaillet, France) and the mid-Atlantic Ridge near the Kane fracture zone (MARK). The Pindos and Oman sites show low susceptibility and remanence (K 250–3008C) occurring at the axis (i.e., Chenaillet, similar to serpentinites from magmatically poor mid-ocean ridges), from lower temperature serpentinization (<200–2508C), likely occurring off axis and possibly during obduction (i.e., Pindos and Oman). At both settings, serpentinization can result in significant hydrogen release.
Earth and Planetary Science Letters | 2016
J. Escartin; F. Leclerc; Jean-Arthur Olive; Catherine Mével; Mathilde Cannat; Sven Petersen; Nico Augustin; Nathalie Feuillet; Christine Deplus; Antoine Bezos; D. Bonnemains; Valérie Chavagnac; Yujin Choi; Marguerite Godard; Kristian Agasøster Haaga; C. Hamelin; Benoit Ildefonse; John Jamieson; Barbara E. John; Thomas Leleu; Christopher J. MacLeod; Miquel Massot-Campos; Paraskevi Nomikou; M. Paquet; Céline Rommevaux-Jestin; Marcel Rothenbeck; Anja Steinführer; Masako Tominaga; Lars Triebe; Ricard Campos
Geochemistry Geophysics Geosystems | 2017
D. Bonnemains; J. Escartin; Catherine Mével; Muriel Andreani; Anne Verlaguet
[Talk] In: AGU Fall Meeting 2014, 15.-19.12.2014, San Francisco, USA . | 2014
J. Escartin; D. Bonnemains; Catherine Mével; Mathilde Cannat; Sven Petersen; Nico Augustin; Antoine Bezos; Valérie Chavagnac; Y. Choi; Marguerite Godard; C. Haaga; C. Hamelin; Benoit Ildefonse; John Jamieson; Barbara E. John; T. Leleu; Christopher J. MacLeod; Miquel Massot-Campos; Paraskevi Nomikou; J.-A. Olive; C. Rommevaux; Marcel Rothenbeck; Anja Steinführer; Masako Tominaga; Lars Triebe; A. Andreani; R. Gracia; R. Prados
Geochemistry Geophysics Geosystems | 2017
D. Bonnemains; J. Escartin; Catherine Mével; Muriel Andreani; Anne Verlaguet
Mevel, C., Escartin, J., Bonnemains, D. and Petersen, Sven and the ODEMAR Science Team (2016) Detachment faulting at the Mid-Atlantic Ridge [Talk] In: 35. International Geological Congress, 27.08.-04.09.2016, Capetown, RSA. | 2016
Catherine Mével; J. Escartin; D. Bonnemains; Sven Petersen
Geochemistry Geophysics Geosystems | 2016
D. Bonnemains; Julie Carlut; J. Escartin; Catherine Mével; M. Andreani; Baptiste Debret
2015 AGU Fall Meeting | 2015
D. Bonnemains
2015 AGU Fall Meeting | 2015
D. Bonnemains