Influence of temperature on brittle creep in sandstones
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...
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| Veröffentlicht in: | Geophysical research letters 2009-10, Vol.36 (19), p.np-n/a |
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| description | 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° to 75°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°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. |
| doi_str_mv | 10.1029/2009GL039373 |
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J. ; Baud, P. ; Meredith, P. G.</creator><creatorcontrib>Heap, M. J. ; Baud, P. ; Meredith, P. G.</creatorcontrib><description>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° to 75°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°C exhibits a qualitatively similar three‐stage brittle creep curve as that observed at ambient temperature. 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J.</creatorcontrib><creatorcontrib>Baud, P.</creatorcontrib><creatorcontrib>Meredith, P. G.</creatorcontrib><title>Influence of temperature on brittle creep in sandstones</title><title>Geophysical research letters</title><addtitle>Geophys. Res. Lett</addtitle><description>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° to 75°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°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.</description><subject>Ambient temperature</subject><subject>brittle creep</subject><subject>Brittleness</subject><subject>Creep (materials)</subject><subject>Deformation</subject><subject>Earth sciences</subject><subject>Earth, ocean, space</subject><subject>Evolution</subject><subject>Exact sciences and technology</subject><subject>Geology</subject><subject>Geophysics</subject><subject>Materials creep</subject><subject>Materials science</subject><subject>Mineralogy</subject><subject>Petrology</subject><subject>Physical properties</subject><subject>Rocks</subject><subject>Sandstones</subject><subject>Sciences of the Universe</subject><subject>Strain rate</subject><subject>Strength</subject><subject>Stress corrosion</subject><subject>Stress corrosion cracking</subject><subject>temperature</subject><subject>Temperature effects</subject><issn>0094-8276</issn><issn>1944-8007</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2009</creationdate><recordtype>article</recordtype><sourceid>8G5</sourceid><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GNUQQ</sourceid><sourceid>GUQSH</sourceid><sourceid>M2O</sourceid><recordid>eNp90N9rFDEQB_AgCp7VN_-ARRBEXM1k8mPzWIpei2sVqfUx5HKzuHUveya7av97c2w5xAefkpDPfJkZxp4Cfw1c2DeCc7tuOVo0eI-twEpZN5yb-2xVfspdGP2QPcr5hnOOHGHFzEXshplioGrsqol2e0p-mlN5xmqT-mkaqAqJaF_1sco-bvM0RsqP2YPOD5me3J0n7Mu7t1dn53X7cX1xdtrWXukGaiMpNA2AUcZLLVBaJTQZAxgUhGZDRgOXXHuDynKJG_CC24Byi1uDQHjCXi653_zg9qnf-XTrRt-789PW9THPjqMSiAZ-QsEvFrxP44-Z8uR2fQ40DD7SOGcHSoIEbe2BPvuH3oxzimUU10grQKlGFPRqQSGNOSfqjh0Ad4eNu783Xvjzu0yfgx-65GPo87FGCCic6-LE4n71A93-N9OtP7dCCzg0XC9FfZ7o97HIp-9OGzTKfb1cu-tP5oO5fn_prvAP72-ZQQ</recordid><startdate>200910</startdate><enddate>200910</enddate><creator>Heap, M. 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J.</au><au>Baud, P.</au><au>Meredith, P. G.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Influence of temperature on brittle creep in sandstones</atitle><jtitle>Geophysical research letters</jtitle><addtitle>Geophys. Res. Lett</addtitle><date>2009-10</date><risdate>2009</risdate><volume>36</volume><issue>19</issue><spage>np</spage><epage>n/a</epage><pages>np-n/a</pages><issn>0094-8276</issn><eissn>1944-8007</eissn><coden>GPRLAJ</coden><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° to 75°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°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.</abstract><cop>Washington, DC</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1029/2009GL039373</doi><tpages>6</tpages><oa>free_for_read</oa></addata></record> |
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| subjects | Ambient temperature brittle creep Brittleness Creep (materials) Deformation Earth sciences Earth, ocean, space Evolution Exact sciences and technology Geology Geophysics Materials creep Materials science Mineralogy Petrology Physical properties Rocks Sandstones Sciences of the Universe Strain rate Strength Stress corrosion Stress corrosion cracking temperature Temperature effects |
| title | Influence of temperature on brittle creep in sandstones |
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