Viscous strengthening followed by slip weakening during frictional melting of chert
Abstract Pelagic chert is one of the major lithologies in accretionary complexes. Thus, frictional properties of chert at seismic slip rates are important for understanding of earthquake faulting in subduction zones. Here, we conducted high-velocity friction experiments on chert collected from the J...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2019-05-01
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| Series: | Earth, Planets and Space |
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| Online Access: | http://link.springer.com/article/10.1186/s40623-019-1035-5 |
| _version_ | 1828810968068521984 |
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| author | Ginta Motohashi Kiyokazu Oohashi Kohtaro Ujiie |
| author_facet | Ginta Motohashi Kiyokazu Oohashi Kohtaro Ujiie |
| author_sort | Ginta Motohashi |
| collection | DOAJ |
| description | Abstract Pelagic chert is one of the major lithologies in accretionary complexes. Thus, frictional properties of chert at seismic slip rates are important for understanding of earthquake faulting in subduction zones. Here, we conducted high-velocity friction experiments on chert collected from the Jurassic accretionary complex in central Japan at a slip rate of 1.3 m/s and normal stresses of 5–13 MPa under room humidity conditions. The results show that initial slip weakening was followed by slip strengthening and subsequent second slip weakening toward a steady-state shear strength. Slip strengthening resulted from the formation of a silica-rich melt layer at lower melting temperatures than expected, which could be due to the presence of water in the illite-containing chert. The second slip weakening may be occurred due to a decrease in shear strain rate associated with the thickening of the melt layer. |
| first_indexed | 2024-12-12T09:20:38Z |
| format | Article |
| id | doaj.art-7bd14d03644649c2878f26724a7c94e9 |
| institution | Directory Open Access Journal |
| issn | 1880-5981 |
| language | English |
| last_indexed | 2024-12-12T09:20:38Z |
| publishDate | 2019-05-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Earth, Planets and Space |
| spelling | doaj.art-7bd14d03644649c2878f26724a7c94e92022-12-22T00:29:14ZengSpringerOpenEarth, Planets and Space1880-59812019-05-017111710.1186/s40623-019-1035-5Viscous strengthening followed by slip weakening during frictional melting of chertGinta Motohashi0Kiyokazu Oohashi1Kohtaro Ujiie2Graduate School of Life and Environmental Sciences, University of TsukubaGraduate School of Sciences and Technology for Innovation, Yamaguchi UniversityGraduate School of Life and Environmental Sciences, University of TsukubaAbstract Pelagic chert is one of the major lithologies in accretionary complexes. Thus, frictional properties of chert at seismic slip rates are important for understanding of earthquake faulting in subduction zones. Here, we conducted high-velocity friction experiments on chert collected from the Jurassic accretionary complex in central Japan at a slip rate of 1.3 m/s and normal stresses of 5–13 MPa under room humidity conditions. The results show that initial slip weakening was followed by slip strengthening and subsequent second slip weakening toward a steady-state shear strength. Slip strengthening resulted from the formation of a silica-rich melt layer at lower melting temperatures than expected, which could be due to the presence of water in the illite-containing chert. The second slip weakening may be occurred due to a decrease in shear strain rate associated with the thickening of the melt layer.http://link.springer.com/article/10.1186/s40623-019-1035-5Frictional meltingPelagic chertViscous strengtheningSilica-rich melt |
| spellingShingle | Ginta Motohashi Kiyokazu Oohashi Kohtaro Ujiie Viscous strengthening followed by slip weakening during frictional melting of chert Earth, Planets and Space Frictional melting Pelagic chert Viscous strengthening Silica-rich melt |
| title | Viscous strengthening followed by slip weakening during frictional melting of chert |
| title_full | Viscous strengthening followed by slip weakening during frictional melting of chert |
| title_fullStr | Viscous strengthening followed by slip weakening during frictional melting of chert |
| title_full_unstemmed | Viscous strengthening followed by slip weakening during frictional melting of chert |
| title_short | Viscous strengthening followed by slip weakening during frictional melting of chert |
| title_sort | viscous strengthening followed by slip weakening during frictional melting of chert |
| topic | Frictional melting Pelagic chert Viscous strengthening Silica-rich melt |
| url | http://link.springer.com/article/10.1186/s40623-019-1035-5 |
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