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High-pressure, High-temperature Deformation Experiment Using the New Generation Griggs-type Apparatus

Jacques Précigout 1, 2 Holger Stünitz 1, 3 Yves Pinquier 4 Rémi Champallier 1 Alexandre Schubnel 4
2 Géodynamique - UMR7327
INSU - CNRS - Institut national des sciences de l'Univers, UO - Université d'Orléans : UMR7327, BRGM - Bureau de Recherches Géologiques et Minières (BRGM), ISTO - Institut des Sciences de la Terre d'Orléans - UMR7327 : UMR7327
Abstract : In order to address geological processes at great depths, rock deformation should ideally be tested at high pressure (> 0.5 GPa) and high temperature (> 300 °C). However, because of the low stress resolution of current solid-pressure-medium apparatuses, high-resolution measurements are today restricted to low-pressure deformation experiments in the gas-pressure-medium apparatus. A new generation of solid-medium piston-cylinder ("Griggs-type") apparatus is here described. Able to perform high-pressure deformation experiments up to 5 GPa and designed to adapt an internal load cell, such a new apparatus offers the potential to establish a technological basis for high-pressure rheology. This paper provides video-based detailed documentation of the procedure (using the "conventional" solid-salt assembly) to perform high-pressure, high-temperature experiments with the newly designed Griggs-type apparatus. A representative result of a Carrara marble sample deformed at 700 °C, 1.5 GPa and 10-5 s-1 with the new press is also given. The related stress-time curve illustrates all steps of a Griggs-type experiment, from increasing pressure and temperature to sample quenching when deformation is stopped. Together with future developments, the critical steps and limitations of the Griggs apparatus are then discussed.
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Submitted on : Wednesday, April 11, 2018 - 2:40:57 PM
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Jacques Précigout, Holger Stünitz, Yves Pinquier, Rémi Champallier, Alexandre Schubnel. High-pressure, High-temperature Deformation Experiment Using the New Generation Griggs-type Apparatus. Journal of visualized experiments : JoVE, JoVE, 2018, pp.56841 - 56841. ⟨10.3791/56841⟩. ⟨insu-01763851⟩

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