NDLI: Using cosmogenic nuclides to contrast rates of erosion and sediment yield in a semi-arid, arroyo- dominated landscape, Rio Puerco Basin, New Mexico

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Using cosmogenic nuclides to contrast rates of erosion and sediment yield in a semi-arid, arroyo- dominated landscape, Rio Puerco Basin, New Mexico

Content Provider	Semantic Scholar
Author	Bierman, Paul R. Reuter, Joanna M. Pavich, Milan J. Gellis, Allen C. Caffee, Marc W. Larsen, Jennifer
Copyright Year	2005
Abstract	Analysis of in-situ-produced 10 Be and 26 Al in 52 fluvial sediment samples shows that millennialscale rates of erosion vary widely (7 to 366 m Ma −1 ) through the lithologically and topographically complex Rio Puerco Basin of northern New Mexico. Using isotopic analysis of both headwater and downstream samples, we determined that the semi-arid, Rio Puerco Basin is eroding, on average, about 100 m Ma −1 . This rapid rate of erosion is consistent with estimates made using other techniques and is likely to result from a combination of easily eroded lithologies, sparse vegetation, and monsoon-dominated rainfall. Data from 331 stream water samples collected by the US Geological Survey between 1960 and 1995 are consistent with basin-wide, average chemical denudation rates of only about 1·4 m Ma − − − − −1 ; thus, the erosion rates we calculate may be considered rates of sediment generation because physical weathering accounts for almost 99 per cent of mass loss. The isotopic data reveal that sediment is generally well mixed downstream with the areaweighted average sediment generation rate for 16 headwater samples (234 ton km −2 a −1 for
Starting Page	935
Ending Page	953
Page Count	19
File Format	PDF HTM / HTML
DOI	10.1002/esp.1255
Volume Number	30
Alternate Webpage(s)	http://geomorphology.sese.asu.edu/Papers/Bierman_etal_2005_ESPL.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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