Frictional properties of exhumed fault gouges in DFDP-1 cores, Alpine Fault, New Zealand
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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 |
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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 |