Arid
DOI10.1130/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
ISSN0016-7606
EISSN1943-2674
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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