| Abstract: | Microcracking related to the formation of a laboratory shear fracture in a cylinder of Westerly granite has been investigated using image-analysis computer techniques. Well away from the fracture, the deformed granite has about twice the crack density of undeformed granite. The microcrack density increases dramatically in a process zone that surrounds the fracture tip, and the fracture tip itself has more than an order of magnitude increase in crack density over the undeformed rock. Microcrack densities are consistently higher on the dilational side of the shear than on the compressional side. The preferred orientation and uneven distribution of microcracks in the process zone tends to pull the propagation fracture tip towards the dilational side. As a result, the propagating shear follows the microcrack trend for some distance and then changes direction in order to maintain an overall in-plane propagation path. -from Authors |
| Genre: | Article |
| ProdID: | 70019720 |
| Citation Author: | Moore, D. E.; Lockner, D. A. |
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| Citation End Page: | 114 |
| Citation Issue: | 1 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of Structural Geology |
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| Citation Number Of Pages: | 20 |
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| Citation Search Results Text: | The role of microcracking in shear-fracture propagation in granite; 1995; Article; Journal; Journal of Structural Geology; Moore, D. E.; Lockner, D. A. |
| Citation Start Page: | 95 |
| Citation Volume: | 17 |
| Citation Year: | 1995 |
| Type: | citation/reference |
| Text: | The role of microcracking in shear-fracture propagation in granite; 1995; Article; Journal; Journal of Structural Geology; Moore, D. E.; Lockner, D. A. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sun, 1 Jan 1995 00:00 -0600 |
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