Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1130/B31767.1 |
Soil production and transport on postorogenic desert hillslopes quantified with Be-10 and Al-26 | |
Struck, Martin1; Jansen, John D.2; Fujioka, Toshiyuki3; Codilean, Alexandru T.1; Fink, David3; Egholm, David L.2; Fulop, Reka-Hajnalka1,3; Wilcken, Klaus M.3; Kotevski, Steven3 | |
通讯作者 | Struck, Martin |
来源期刊 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN
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ISSN | 0016-7606 |
EISSN | 1943-2674 |
出版年 | 2018 |
卷号 | 130期号:5-6页码:1017-1040 |
英文摘要 | Hillslopes stand at the top of the geomorphic conveyor belt that produces and transports mass throughout landscapes. Quantification of the tempo of hillslope evolution is key to identifying primary sediment production and understanding how surface processes shape topography. We measured cosmogenic(10)Be and Al-26 on three desert hillslopes in postorogenic central Australia and quantified their soil dynamics and evolution. We found that hillslope morphology is governed by lithological factors, and differing nuclide abundances reflect the main sediment transport processes. Slope wash is widespread, and shrink-swell soil processes drive downslope creep and upward migration of gravels detached from underlying bedrock. We applied Monte Carlo-based inversion modeling to reconstruct soil production and the exhumation histories of stony mantle gravels. Underlying silty soils derive from eolian dust inputs dating to at least 0.2 Ma and possibly more than 1 Ma, in line with intensified aridity. Exposed bedrock erodes at similar to 0.2-7 m/m.y., and under soil, it erodes at maximum rates of <0.1 m/m.y. up to 10 m/m.y. Accordingly, particles spend 2-6 m.y. or more in the upper 0.6 m of the bedrock column and an additional similar to 0.2-2 m.y. or more within hillslope soils. Such long periods near the surface result in surface particles acquiring inherently low Al-26/Be-10 ratios. Bedrock erodibility underpins regional variations in erosion rate, and the slow tempo of hillslope evolution is largely independent of base level. This suggests a distinctive top-down evolution among postorogenic hillslopes set by authigenic rates of sediment production, rather than by fluvial incision as in tectonically active settings. |
类型 | Article |
语种 | 英语 |
国家 | Australia ; Denmark |
收录类别 | SCI-E |
WOS记录号 | WOS:000432588700017 |
WOS关键词 | NEW-SOUTH-WALES ; COSMOGENIC NUCLIDES ; LANDSCAPE EVOLUTION ; EROSION RATES ; HALF-LIFE ; ATACAMA DESERT ; FUNCTIONAL-RELATIONSHIPS ; SEDIMENT TRANSPORT ; DENUDATION RATES ; MOUNTAIN EROSION |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/209634 |
作者单位 | 1.Univ Wollongong, Sch Earth & Environm Sci, Wollongong, NSW 2522, Australia; 2.Aarhus Univ, Dept Geosci, DK-8000 Aarhus C, Denmark; 3.Australian Nucl Sci & Technol Org, Lucas Heights 2234, Australia |
推荐引用方式 GB/T 7714 | Struck, Martin,Jansen, John D.,Fujioka, Toshiyuki,et al. Soil production and transport on postorogenic desert hillslopes quantified with Be-10 and Al-26[J],2018,130(5-6):1017-1040. |
APA | Struck, Martin.,Jansen, John D..,Fujioka, Toshiyuki.,Codilean, Alexandru T..,Fink, David.,...&Kotevski, Steven.(2018).Soil production and transport on postorogenic desert hillslopes quantified with Be-10 and Al-26.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,130(5-6),1017-1040. |
MLA | Struck, Martin,et al."Soil production and transport on postorogenic desert hillslopes quantified with Be-10 and Al-26".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 130.5-6(2018):1017-1040. |
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