QUATERNARY SCIENCE REVIEWS | 卷:105 |
Quaternary landscape development, alluvial fan chronology and erosion of the Mecca Hills at the southern end of the San Andreas Fault zone | |
Article | |
Gray, Harrison J.1,2  Owen, Lewis A.2  Dietsch, Craig2  Beck, Richard A.3  Caffee, Marc A.4  Finkel, Robert C.5  Mahan, Shannon A.1  | |
[1] US Geol Survey, Denver, CO 80225 USA | |
[2] Univ Cincinnati, Dept Geol, Cincinnati, OH 45221 USA | |
[3] Univ Cincinnati, Dept Geog, Cincinnati, OH 45221 USA | |
[4] Purdue Univ, Dept Phys, PRIME Lab, W Lafayette, IN 47906 USA | |
[5] Univ Calif Berkeley, Dept Earth & Planetary Sci, Berkeley, CA 94720 USA | |
关键词: Terrestrial cosmogenic nuclides; Beryllium-10; Surface exposure dating; Mecca Hills; San Andreas Fault; | |
DOI : 10.1016/j.quascirev.2014.09.009 | |
来源: Elsevier | |
【 摘 要 】
Quantitative geomorphic analysis combined with cosmogenic nuclide Be-10-based geochronology and denudation rates have been used to further the understanding of the Quaternary landscape development of the Mecca Hills, a zone of transpressional uplift along the southern end of the San Andreas Fault, in southern California. The similar timing of convergent uplifts along the San Andreas Fault with the initiation of the sub-parallel San Jacinto Fault suggest a possible link between the two tectonic events. The ages of alluvial fans and the rates of catchment-wide denudation have been integrated to assess the relative influence of climate and tectonic uplift on the development of catchments within the Mecca Hills. Ages for major geomorphic surfaces based on Be-10 surface exposure dating of boulders and Be-10 depth profiles define the timing of surface stabilization to 2.6 +5.6/-1.3 ka (Qyf1 surface), 67.2 +/- 5.3 ka (Qvof2 surface), and 280 +/- 24 ka (Qvof1 surface). Comparison of Be-10 measurements from active channel deposits (Qac) and fluvial terraces (Qt) illustrate a complex history of erosion, sediment storage, and sediment transport in this environment. Beryllium-10 catchment-wide denudation rates range from 19.9 +/- 32 to 149 +/- 22.5 m/Ma and demonstrate strong correlations with mean catchment slope and with total active fault length normalized by catchment area. The lack of strong correlation with other geomorphic variables suggests that tectonic uplift and rock weakening have the greatest control. The currently measured topography and denudation rates across the Mecca Hills may be most consistent with a model of radial topographic growth in contrast to a model based on the rapid uplift and advection of crust. Published by Elsevier Ltd.
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