Denali fault slip rates and Holocene-late Pleistocene kinematics of central Alaska
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Abstract
The Denali fault is the principal intracontinental strike-slip fault accommodating deformation of interior Alaska associated with the Yakutat plate convergence. We obtained the first quantitative late Pleistocene-Holocene slip rates on the Denali fault system from dating offset geomorphic features. Analysis of cosmogenic 10Be concentrations in boulders (n = 27) and sediment (n = 13) collected at seven sites, offset 25-170 m by the Denali and Totschunda faults, gives average ages that range from 2.4 ± 0.3 ka to 17.0 ± 1.8 ka. These offsets and ages yield late Pleistocene-Holocene average slip rates of 9.4 ± 1.6, 12.1 ± 1.7, and 8.4 ± 2.2 mm/yr-1 along the western, central, and eastern Denali fault, respectively, and 6.0 ± 1.2 mm/yr-1 along the Totschunda fault. Our results suggest a westward decrease in the mean Pleistocene-Holocene slip rate. This westward decrease likely results from partitioning of slip from the Denali fault system to thrust faults to the north and west. 2006 Geological Society of America.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Denali fault slip rates and Holocene-late Pleistocene kinematics of central Alaska |
| Series title | Geology |
| DOI | 10.1130/G22361.1 |
| Volume | 34 |
| Issue | 8 |
| Year Published | 2006 |
| Language | English |
| Contributing office(s) | Alaska Science Center |
| Description | 4 p. |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Geology |
| First page | 645 |
| Last page | 648 |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |