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1 Department of Geology, Humboldt State University, Arcata, California 95521, USA
2 Department of Geology, University of Vermont, Burlington, Vermont 05405, USA
3 Department of Geological Sciences, University of Washington, Seattle, Washington 98195, USA
4 Department of Geology, Humboldt State University, Arcata, California 95521, USA
5 Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore, California 94550, USA
Long-term deformation along the Fish Springs fault in Owens Valley, California, is recorded by offset landforms, including a previously dated cinder cone (39Ar/40Ar, 314 ± 36 ka, 2
), several debris-flow fans and levees deposited by Birch Creek, stream channels, and lava flows of nearby Crater Mountain. The 10Be and 26Al model exposure ages (n = 68) delimit fan ages and suggest that deposition stopped after ca. 136, 15, 13, and 8 ka. One fan remains active and has undergone deposition throughout the Holocene. Soil development on three fans, where boulders were sampled for 10Be and 26Al analysis, also indicates distinct ages. Together, soil development and cosmogenic isotope data suggest that fan deposits correlate with the Tahoe and late Tioga glaciations. Soil profile development index values from Fish Springs are low compared with those determined elsewhere, suggesting relatively slow rates of soil formation for fan surfaces at Fish Springs and/or modification of soil profiles by surface processes during or following soil formation. Age estimates and measured offsets of the fans are consistent with a long-term vertical slip rate of 0.24 ± 0.04 m k.y.–1 for the Fish Springs fault over the past 300 k.y.
Key Words: fans • faulting • isotopes • Owens Valley • soils
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