Frictional properties of exhumed fault gouges in DFDP-1 cores, Alpine Fault, New Zealand
Links
- More information: Publisher Index Page (via DOI)
- Open Access Version: Publisher Index Page
- Download citation as: RIS | Dublin Core
Abstract
Principal slip zone gouges recovered during the Deep Fault Drilling Project (DFDP-1), Alpine Fault, New Zealand, were deformed in triaxial friction experiments at temperatures, T, of up to 350°C, effective normal stresses, σn′, of up to 156 MPa, and velocities between 0.01 and 3 µm/s. Chlorite/white mica-bearing DFDP-1A blue gouge, 90.62 m sample depth, is frictionally strong (friction coefficient, μ, 0.61–0.76) across all experimental conditions tested (T = 70–350°C, σn′ = 31.2–156 MPa); it undergoes a transition from positive to negative rate dependence as T increases past 210°C. The friction coefficient of smectite-bearing DFDP-1B brown gouge, 128.42 m sample depth, increases from 0.49 to 0.74 with increasing temperature and pressure (T = 70–210°C, σn′ = 31.2–93.6 MPa); the positive to negative rate dependence transition occurs as T increases past 140°C. These measurements indicate that, in the absence of elevated pore fluid pressures, DFDP-1 gouges are frictionally strong under conditions representative of the seismogenic crust.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Frictional properties of exhumed fault gouges in DFDP-1 cores, Alpine Fault, New Zealand |
| Series title | Geophysical Research Letters |
| DOI | 10.1002/2013GL058236 |
| Volume | 41 |
| Issue | 2 |
| Year Published | 2014 |
| Language | English |
| Publisher | AGU |
| Contributing office(s) | Earthquake Science Center |
| Description | 7 p. |
| First page | 356 |
| Last page | 362 |
| Country | New Zealand |
| Other Geospatial | Alpine Fault |
| Google Analytic Metrics | Metrics page |