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Influence of temperature on brittle creep in sandstones

Heap, MJ; Baud, P; Meredith, PG; (2009) Influence of temperature on brittle creep in sandstones. Geophysical Research Letters , 36 , Article L19305. 10.1029/2009GL039373. Green open access

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Abstract

The characterization of time-dependent brittle creep, promoted by chemically active pore fluids, is fundamental to our understanding of the long-term evolution and dynamics of the Earth's crust. Here we report results from a study of the influence of temperature on both short-term strength and time-dependent brittle creep in three sandstones under triaxial stress conditions. We show that an increase in temperature from 20 degrees to 75 degrees C significantly enhances stress corrosion cracking in all three sandstones, leading to (1) a systematic reduction in strength during constant strain rate experiments and (2) an increase by several orders of magnitude in brittle creep strain rates during stress-stepping creep experiments. We also show that a conventional creep experiment performed at 75 degrees C exhibits a qualitatively similar three-stage brittle creep curve as that observed at ambient temperature. Extrapolation of our results suggests that temperature is likely to be the dominant influence on the evolution of creep strain rate with depth in the shallow crust. Citation: Heap, M. J., P. Baud, and P. G. Meredith (2009), Influence of temperature on brittle creep in sandstones, Geophys. Res. Lett., 36, L19305, doi: 10.1029/2009GL039373.

Type: Article
Title: Influence of temperature on brittle creep in sandstones
Open access status: An open access version is available from UCL Discovery
DOI: 10.1029/2009GL039373
Publisher version: http://dx.doi.org/10.1029/2009GL039373
Language: English
Additional information: Copyright 2009 by the American Geophysical Union
Keywords: Tensile crack-propagation, Stress-corrosion, Granite, Growth, Quartz
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences
URI: https://discovery-pp.ucl.ac.uk/id/eprint/168720
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