Tectonic model explaining divergent contraction directions along the Cascadia subduction margin, Washington
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Abstract
Differential motion across the central Cascadia subduction boundary in Washington results in a complex pattern of folds and faults within the shelf and onshore parts of the accretionary margin. Faults and folds above a coastal, north-northwest–trending thrust system provide evidence of ongoing subduction-related contraction. South of this coastal thrust system many fold axes and thrust faults trend east-northeast, in the direction of convergence. These structures are not consistent with a simple subduction system undergoing northeastward convergence. This deformation, adjacent to the boundary between the subduction complex and the Siletz terrane, may be driven by relative convergence between the northward-translating Siletz terrane and the subduction complex. The regional pattern of modern uplift rates is consistent with ongoing north-south contraction across this boundary and the north-south compressional stress field in the area.
Suggested Citation
McCrory, P., 1996, Tectonic model explaining divergent contraction directions along the Cascadia subduction margin, Washington: Geology, v. 24, no. 10, p. 929-932, https://doi.org/10.1130/0091-7613(1996)024<0929:TMEDCD>2.3.CO;2.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Tectonic model explaining divergent contraction directions along the Cascadia subduction margin, Washington |
| Series title | Geology |
| DOI | 10.1130/0091-7613(1996)024<0929:TMEDCD>2.3.CO;2 |
| Volume | 24 |
| Issue | 10 |
| Year Published | 1996 |
| Language | English |
| Publisher | Geological Society of America |
| Description | 4 p. |
| First page | 929 |
| Last page | 932 |