A note on the frictional strength of laumontite from Cajon Pass, California
Geophysical Research Letters
By: C.A. Morrow and J.D. Byerlee
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Abstract
Laumontite mineralization is pervasive in joints and shear zones encountered in the Cajon Pass drillhole in southern California. In order to determine whether a gouge composed of this hydrated mineral affects shear strength in a manner similar to low-strength, clay-rich fault gouges, frictional sliding experiments were performed under dry, saturated and high pore pressure conditions at effective pressures up to 450 MPa. Coefficients of friction ranged between 0.66 and 0.84, consistent with most crustal rocks and well above the values typical of clay-rich San Andreas fault gouges. Saturation state had no effect on strength or sliding stability. These results suggest that the presence of laumontite in shear zones at Cajon Pass will not affect the shear strength of the rock in a way that can account for the inferred low ambient shear stresses. -Authors
Suggested Citation
Morrow, C., Byerlee, J., 1991, A note on the frictional strength of laumontite from Cajon Pass, California: Geophysical Research Letters, v. 18, no. 2, p. 211-214.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | A note on the frictional strength of laumontite from Cajon Pass, California |
| Series title | Geophysical Research Letters |
| Volume | 18 |
| Issue | 2 |
| Year Published | 1991 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Geophysical Research Letters |
| First page | 211 |
| Last page | 214 |