| Title: |
Correlation of deformation textures with laboratory measurements of permeability and C○ 2003 |
| Authors: |
Diane E. Moore; David A. Lockner; Hisao Ito; Ryuji Ikeda |
| Contributors: |
The Pennsylvania State University CiteSeerX Archives |
| Source: |
http://earthquake.usgs.gov/research/physics/lab/ExtAbsform.pdf. |
| Publication Year: |
1999 |
| Collection: |
CiteSeerX |
| Description: |
The deformation textures observed in 22 core samples of intact and altered granodiorite from two drillholes into the Nojima fault zone are consistent with the permeability and strength data reported by Naka et al. (1998) for those samples. The highest measured permeability was in a sample subjected only to dilational cracking. More intense fracturing accompanying microshear development also produces relatively high permeability, if the fragments generated by the deformation are relatively large. In these rocks, the fracturing intensity is directly correlated with the amount of strength reduction. Progressive granulation of the fragmented rock generates fine-grained gouge of low shear strength and moderately low permeability. The deformation and mineralization features observed in the sample set have been combined into a general model for the evolution of a gouge layer relative to its permeability and strength. Of the four possible fault strands encountered in the two drillholes, the GSJ and shallowest NIED fault strands appear to be currently active, whereas the deepest NIED fault strand was abandoned and has since been thoroughly sealed with mineral deposits. The middle NIED strand also shows some evidence of recent shearing, although the two examined gouge samples are overprinted by dilational cracking. |
| Document Type: |
text |
| File Description: |
application/pdf |
| Language: |
English |
| Relation: |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.532.698; http://earthquake.usgs.gov/research/physics/lab/ExtAbsform.pdf |
| Availability: |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.532.698; http://earthquake.usgs.gov/research/physics/lab/ExtAbsform.pdf |
| Rights: |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
| Accession Number: |
edsbas.34619B1F |
| Database: |
BASE |