Blar i forfatter "Stünitz, Holger"

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    • Amorphous material in experimentally deformed mafic rock and its temperature dependence: Implications for fault rheology during aseismic creep and seismic rupture 

      Marti, Sina; Stünitz, Holger; Heilbronner, Renee; Plümper, Oliver (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-05-20)
      Amorphous materials are frequently observed in natural and experimentally produced fault rocks. Their common occurrence suggests that amorphous materials are of importance to fault zone dynamics. However, little is known about the physico-chemical impact of amorphous materials on fault rheology. Here we present deformation experiments on mafic fault rock, where amorphous material forms due to intense ...

    • Excess water storage induced by viscous strain localization during high-pressure shear experiment 

      Précigout, Jacques; Stünitz, Holger; Villeneuve, Johan (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-03-05)
      Strain localization in viscously deformed rocks commonly results in fine-grained shear zones where massive fluid circulation is regularly observed. Recently attributed to strain-induced pumping, this phenomenon may have major implications for the distribution of ores deposits and rock rheology. However, although grain size reduction and/or creep cavitation have been proposed as important processes, ...

    • Experimental grain growth of quartz aggregates under wet conditions and its application to deformation in nature 

      Fukuda, Junichi; Raimbourg, Hugues; Shimizu, Ichiko; Neufeld, Kai; Stünitz, Holger (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-05-13)
      Grain growth of quartz was investigated using two quartz samples (powder and novaculite) with water under pressure and temperature conditions of 1.0–2.5 GPa and 800–1100 ∘C. The compacted powder preserved a substantial porosity, which caused a slower grain growth than in the novaculite. We assumed a grain growth law of <i>d<sup>n</sup>−d<sup>n</sup><sub>0</sub>=k</i><sub>0</sub><i>f<sup>r</sup><su ...

    • Rheological Weakening of Olivine + Orthopyroxene Aggregates Due To Phase Mixing: Part 2. Microstructural Development 

      Tasaka, Miki; Zimmerman, Mark E; Kohlstedt, David L.; Stünitz, Holger; Heilbronner, Renée (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-09-08)
      To understand the processes involved in phase mixing during deformation and the resulting changes in rheological behavior, we conducted torsion experiments on samples of iron‐rich olivine plus orthopyroxene. The experiments were conducted at a temperature, T, of 1200°C and a confining pressure, P, of 300 MPa using a gas‐medium deformation apparatus. Samples composed of olivine plus 26% orthopyroxene ...