Assessing the reliability of U-series and 10Be dating techniques on alluvial fans in the Anza Borrego Desert, California

被引:36
作者
Blisniuk, Kimberly [1 ,2 ]
Oskin, Michael [3 ]
Fletcher, Kathryn [1 ,2 ]
Rockwell, Thomas [4 ]
Sharp, Warren [1 ]
机构
[1] Berkeley Geochronol Ctr, Berkeley, CA 94709 USA
[2] Univ Calif Berkeley, Dept Earth & Planetary Sci, Berkeley, CA 94709 USA
[3] Univ Calif Davis, Dept Geol Sci, Davis, CA 95616 USA
[4] San Diego State Univ, Dept Geol Sci, San Diego, CA 92182 USA
关键词
U-series dating; Be-10 cosmogenic exposure dating; Alluvial fan; Anza Borrego desert; SITU COSMOGENIC NUCLIDES; SAN-ANDREAS FAULT; PRODUCTION-RATES; PEDOGENIC CARBONATE; SCALING FACTORS; CLIMATE-CHANGE; EROSION RATES; SURFACES; SOILS; SLIP;
D O I
10.1016/j.quageo.2012.08.004
中图分类号
P9 [自然地理学];
学科分类号
0705 ; 070501 ;
摘要
We combine Be-10 exposure dating with U-series dating of pedogenic carbonate from subsurface clast-coatings to date deposition of mid-Holocene to late Pleistocene alluvial fans at four sites in the Anza Borrego desert of California. Since each dating technique is subject to distinct assumptions, their systematic uncertainties are largely independent. We therefore consider Be-10 and U-series dates that are consistent to be highly reliable. If post-depositional erosion has not significantly modified a fan surface, exposure dates should yield maximum ages when no correction is made for inheritance. U-series dating, in contrast, provides minimum dates because pedogenic carbonate forms after fan deposition. Accordingly, agreement between dates from the two techniques (or lack thereof) provides a stringent test of their reliability. Our results show that: (1) concordant Be-10 and U-series dates were measured for most fans, thereby providing robust age estimates, (2) U-series dating of pedogenic carbonate can be successfully applied to alluvium as young as mid-Holocene and (3) Be-10 inheritance of the studied Holocene fan deposits appears to be significantly lower than implied by Be-10 concentrations in active wash deposits. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码:26 / 41
页数:16
相关论文
共 71 条
[1]  
Anderson RS, 1996, GEOLOGY, V24, P47, DOI 10.1130/0091-7613(1996)024<0047:ETOIID>2.3.CO
[2]  
2
[3]  
ARKLEY RODNEY J., 1963, SOIL SCI, V96, P239, DOI 10.1097/00010694-196310000-00003
[4]   Timing and controls on late Quaternary landscape development along the eastern Sierra El Mayor range front in northern Baja California, Mexico [J].
Armstrong, Phillip A. ;
Perez, Rene ;
Owen, Lewis A. ;
Finkel, Robert C. .
GEOMORPHOLOGY, 2010, 114 (03) :415-430
[5]   Late Miocene Pleistocene extensional faulting, northern Gulf of California, Mexico and Salton Trough, California [J].
Axen, GJ ;
Fletcher, JM .
INTERNATIONAL GEOLOGY REVIEW, 1998, 40 (03) :217-244
[6]   A complete and easily accessible means of calculating surface exposure ages or erosion rates from 10Be and 26Al measurements [J].
Balco, Greg ;
Stone, John O. ;
Lifton, Nathaniel A. ;
Dunai, Tibor J. .
QUATERNARY GEOCHRONOLOGY, 2008, 3 (03) :174-195
[7]   Regional beryllium-10 production rate calibration for late-glacial northeastern North America [J].
Balco, Greg ;
Briner, Jason ;
Finkel, Robert C. ;
Rayburn, John A. ;
Ridge, John C. ;
Schaefer, Joerg M. .
QUATERNARY GEOCHRONOLOGY, 2009, 4 (02) :93-107
[8]   Uncertainties in slip-rate estimates for the Mission Creek strand of the southern San Andreas fault at Biskra Palms Oasis, southern California [J].
Behr, W. M. ;
Rood, D. H. ;
Fletcher, K. E. ;
Guzman, N. ;
Finkel, R. ;
Hanks, T. C. ;
Hudnut, K. W. ;
Kendrick, K. J. ;
Platt, J. P. ;
Sharp, W. D. ;
Weldon, R. J. ;
Yule, J. D. .
GEOLOGICAL SOCIETY OF AMERICA BULLETIN, 2010, 122 (9-10) :1360-1377
[10]  
Birkeland P.W., 1985, SOILS GEOMORPHOLOGY, V122, P307, DOI 10.1017/S0016756800031617