In JoVE (1)
Other Publications (1)
Articles by Jacques Précigout in JoVE
High-pressure, High-temperature Deformation Experiment Using the New Generation Griggs-type Apparatus Jacques Précigout1, Holger Stünitz1,2, Yves Pinquier3, Rémi Champallier1, Alexandre Schubnel3 1Institut des Sciences de la Terre d’Orléans (ISTO), UMR 7327, CNRS-BRGM, Université d’Orléans, 2Department of Geology, University of Tromsø, 3Laboratoire de Géologie, UMR 8538, CNRS, Ecole Normale Supérieure (ENS Paris) Rock deformation needs to be quantified at high pressure. A description of the procedure to perform deformation experiments in a newly designed solid-medium Griggs-type apparatus is here given. This provides technological basis for future rheological studies at pressures up to 5 GPa.
Other articles by Jacques Précigout on PubMed
Water Pumping in Mantle Shear Zones Nature Communications. Jun, 2017 | Pubmed ID: 28593947 Water plays an important role in geological processes. Providing constraints on what may influence the distribution of aqueous fluids is thus crucial to understanding how water impacts Earth's geodynamics. Here we demonstrate that ductile flow exerts a dynamic control on water-rich fluid circulation in mantle shear zones. Based on amphibole distribution and using dislocation slip-systems as a proxy for syn-tectonic water content in olivine, we highlight fluid accumulation around fine-grained layers dominated by grain-size-sensitive creep. This fluid aggregation correlates with dislocation creep-accommodated strain that localizes in water-rich layers. We also give evidence of cracking induced by fluid pressure where the highest amount of water is expected. These results emphasize long-term fluid pumping attributed to creep cavitation and associated phase nucleation during grain size reduction. Considering the ubiquitous process of grain size reduction during strain localization, our findings shed light on multiple fluid reservoirs in the crust and mantle.