Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.yqres.2006.02.010 |
Isotopic insights into smoothening of abandoned fan surfaces, Southern California | |
Matmon, A; Nichols, K; Finkel, R | |
通讯作者 | Matmon, A |
来源期刊 | QUATERNARY RESEARCH |
ISSN | 0033-5894 |
出版年 | 2006 |
卷号 | 66期号:1页码:109-118 |
英文摘要 | Cosmogenic nuclide concentrations measured on abandoned fan surfaces along the Mojave section of the San Andreas Fault suggest that sediment is generated, transported, and removed from the fans on the order of 30-40 kyr. We measured in situ produced cosmogenic Be-10, and in some cases Al-26, in boulders (n = 15), surface sediment (n = 15), and one depth profile (n = 9). Nuclide concentrations in surface sediments and boulders underestimate fan ages, suggesting that 10Be accumulation is largely controlled by the geomorphic processes that operate on the surfaces of the fans and not by their ages. Field observations, grain-size distribution, and cosmogenic nuclide data suggest that over time, boulders weather into grus and the bar sediments diffuse into the adjacent swales. As fans grow older the relief between bars and swales decreases, the sediment transport rate from bars to swales decreases, and the surface processes that erode the fan become uniform over the entire fan surface. The nuclide data therefore suggest that, over time, the difference in Be-10 concentration between bars and swales increases to a maximum until the topographic relief between bars and swales is minimized, resulting in a common surface lowering rate and common 10Be concentrations across the fan. During this phase, the entire fan is lowered homogeneously at a rate of 10-15 mm kyr(-1). (c) 2006 University of Washington. All rights reserved. |
英文关键词 | Be-10 Al-26 nuclide concentration |
类型 | Article |
语种 | 英语 |
国家 | Israel ; USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000238690400010 |
WOS关键词 | COSMOGENIC NUCLIDES ; SEDIMENT PRODUCTION ; PRODUCTION-RATES ; EROSION RATES ; MOJAVE DESERT ; NAMIB DESERT ; SLIP RATES ; BE-10 ; AL-26 ; HISTORIES |
WOS类目 | Geography, Physical ; Geosciences, Multidisciplinary |
WOS研究方向 | Physical Geography ; Geology |
来源机构 | United States Geological Survey ; Hebrew University of Jerusalem |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/152880 |
作者单位 | (1)Hebrew Univ Jerusalem, Inst Earth Sci, IL-91904 Jerusalem, Israel;(2)Skidmore Coll, Dept Geosci, Saratoga Springs, NY 12866 USA;(3)US Geol Survey, Menlo Pk, CA 94025 USA;(4)Lawrence Livermore Natl Lab, Livermore, CA 94550 USA |
推荐引用方式 GB/T 7714 | Matmon, A,Nichols, K,Finkel, R. Isotopic insights into smoothening of abandoned fan surfaces, Southern California[J]. United States Geological Survey, Hebrew University of Jerusalem,2006,66(1):109-118. |
APA | Matmon, A,Nichols, K,&Finkel, R.(2006).Isotopic insights into smoothening of abandoned fan surfaces, Southern California.QUATERNARY RESEARCH,66(1),109-118. |
MLA | Matmon, A,et al."Isotopic insights into smoothening of abandoned fan surfaces, Southern California".QUATERNARY RESEARCH 66.1(2006):109-118. |
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