Portal de Periódicos da CAPES

Soil production and transport on postorogenic desert hillslopes quantified with 10Be and 26Al

2018; Geological Society of America; Volume: 130; Issue: 5-6 Linguagem: Inglês

10.1130/b31767.1

1943-2674

Martin Struck, John D. Jansen, Toshiyuki Fujioka, Alexandru T. Codilean, David Fink, David L. Egholm, Réka‐Hajnalka Fülöp, Klaus M. Wilcken, Steven Kotevski,

Soil erosion and sediment transport

Research Article| January 02, 2018 Soil production and transport on postorogenic desert hillslopes quantified with 10Be and 26Al Martin Struck; Martin Struck † 1School of Earth and Environmental Sciences, University of Wollongong, Wollongong 2522, Australia †ms646@uowmail.edu.au; martin.struck@yahoo.de. Search for other works by this author on: GSW Google Scholar John D. Jansen; John D. Jansen 2Department of Geoscience, Aarhus University, 8000 Aarhus C, Denmark Search for other works by this author on: GSW Google Scholar Toshiyuki Fujioka; Toshiyuki Fujioka 3Australian Nuclear Science and Technology Organisation, Lucas Heights 2234, Australia Search for other works by this author on: GSW Google Scholar Alexandru T. Codilean; Alexandru T. Codilean 1School of Earth and Environmental Sciences, University of Wollongong, Wollongong 2522, Australia Search for other works by this author on: GSW Google Scholar David Fink; David Fink 3Australian Nuclear Science and Technology Organisation, Lucas Heights 2234, Australia Search for other works by this author on: GSW Google Scholar David L. Egholm; David L. Egholm 2Department of Geoscience, Aarhus University, 8000 Aarhus C, Denmark Search for other works by this author on: GSW Google Scholar Réka-Hajnalka Fülöp; Réka-Hajnalka Fülöp 1School of Earth and Environmental Sciences, University of Wollongong, Wollongong 2522, Australia3Australian Nuclear Science and Technology Organisation, Lucas Heights 2234, Australia Search for other works by this author on: GSW Google Scholar Klaus M. Wilcken; Klaus M. Wilcken 3Australian Nuclear Science and Technology Organisation, Lucas Heights 2234, Australia Search for other works by this author on: GSW Google Scholar Steven Kotevski Steven Kotevski 3Australian Nuclear Science and Technology Organisation, Lucas Heights 2234, Australia Search for other works by this author on: GSW Google Scholar Author and Article Information Martin Struck † 1School of Earth and Environmental Sciences, University of Wollongong, Wollongong 2522, Australia John D. Jansen 2Department of Geoscience, Aarhus University, 8000 Aarhus C, Denmark Toshiyuki Fujioka 3Australian Nuclear Science and Technology Organisation, Lucas Heights 2234, Australia Alexandru T. Codilean 1School of Earth and Environmental Sciences, University of Wollongong, Wollongong 2522, Australia David Fink 3Australian Nuclear Science and Technology Organisation, Lucas Heights 2234, Australia David L. Egholm 2Department of Geoscience, Aarhus University, 8000 Aarhus C, Denmark Réka-Hajnalka Fülöp 1School of Earth and Environmental Sciences, University of Wollongong, Wollongong 2522, Australia3Australian Nuclear Science and Technology Organisation, Lucas Heights 2234, Australia Klaus M. Wilcken 3Australian Nuclear Science and Technology Organisation, Lucas Heights 2234, Australia Steven Kotevski 3Australian Nuclear Science and Technology Organisation, Lucas Heights 2234, Australia †ms646@uowmail.edu.au; martin.struck@yahoo.de. Publisher: Geological Society of America Received: 07 Feb 2017 Revision Received: 06 Jul 2017 Accepted: 29 Nov 2017 First Online: 02 Jan 2018 Online Issn: 1943-2674 Print Issn: 0016-7606 © 2018 Geological Society of America GSA Bulletin (2018) 130 (5-6): 1017–1040. https://doi.org/10.1130/B31767.1 Article history Received: 07 Feb 2017 Revision Received: 06 Jul 2017 Accepted: 29 Nov 2017 First Online: 02 Jan 2018 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Martin Struck, John D. Jansen, Toshiyuki Fujioka, Alexandru T. Codilean, David Fink, David L. Egholm, Réka-Hajnalka Fülöp, Klaus M. Wilcken, Steven Kotevski; Soil production and transport on postorogenic desert hillslopes quantified with 10Be and 26Al. GSA Bulletin 2018;; 130 (5-6): 1017–1040. doi: https://doi.org/10.1130/B31767.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract 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 10Be and 26Al 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 ∼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 ∼0.2–2 m.y. or more within hillslope soils. Such long periods near the surface result in surface particles acquiring inherently low 26Al/10Be 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. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.