26Al/10Be dating of an aeolian dust mantle soil in western New South Wales, Australia

Simple item page
dc.contributor.authorFisher, Aen_AU
dc.contributor.authorFink, Den_AU
dc.contributor.authorChappell, JMAen_AU
dc.contributor.authorMelville, MDen_AU
dc.date.accessioned2020-06-11T01:32:56Zen_AU
dc.date.available2020-06-11T01:32:56Zen_AU
dc.date.issued2014-08-15en_AU
dc.date.statistics2020-05-28en_AU
dc.description.abstractAeolian dust mantle soils are an important element of many landscapes in south-eastern Australia, though the age of these aeolian deposits has not been radiometrically determined. At Fowlers Gap in western New South Wales, surface cobbles of silcrete and quartz overlie a stone-free, aeolian dust mantle soil, which has a thickness of about 1.6m. The clay-rich aeolian dust deposit in turn lies upon a buried silcrete and quartz stone layer. Modelling in-situ cosmogenic 26Al and 10Be concentrations measured in both the surface quartz stones and in the buried quartz layer of rocks, reveals that each has experienced a complex exposure-burial history. Due to the absence of quartz stones or sand at intermediate depths, our cosmogenic 26Al and 10Be modelling was not able to determine a definitive mechanism of stone pavement formation and stone burial. Various scenarios of stone formation, transport, burial and exhumation were tested that constrain the age of the deposit to range from 0.9±0.2Ma to 1.8±0.2Ma, based largely on different assumptions taken for the time-dependency of the net sedimentation rate. This corresponds with the initiation of the Simpson Desert dune fields and the deflation of lakes in central Australia, which probably responded to the shift to longer-wavelength, larger-amplitude Quaternary glacial cycles at around 1Ma. Sensitivity analyses were carried out to identify those parameters which better constrained model outputs. Within model errors, which largely are the result of analytical errors in measured 26Al and 10Be concentrations, all three competing theories of colluvial wash, upward displacement of stones, and cumulic pedogenesis are possible mechanisms for the formation of the surface stone pavement. © 2020 Elsevier B.Ven_AU
dc.identifier.citationFisher, A., Fink, D., Chappell, J., & Melville, M. (2014). 26Al/10Be dating of an aeolian dust mantle soil in western New South Wales, Australia. Geomorphology, 219, 201-212. doi:10.1016/j.geomorph.2014.05.007en_AU
dc.identifier.govdoc9597en_AU
dc.identifier.issn0169-555Xen_AU
dc.identifier.journaltitleGeomorphologyen_AU
dc.identifier.pagination201-212en_AU
dc.identifier.urihttps://doi.org/10.1016/j.geomorph.2014.05.007en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/9557en_AU
dc.identifier.volume219en_AU
dc.language.isoenen_AU
dc.publisherElsevier B.V.en_AU
dc.subjectCosmic dusten_AU
dc.subjectDustsen_AU
dc.subjectIsotopesen_AU
dc.subjectAluminium 26en_AU
dc.subjectBeryllium 10en_AU
dc.subjectDesertsen_AU
dc.subjectNew South Walesen_AU
dc.subjectAustraliaen_AU
dc.subjectQuartzen_AU
dc.subjectQuaternary perioden_AU
dc.title26Al/10Be dating of an aeolian dust mantle soil in western New South Wales, Australiaen_AU
dc.typeJournal Articleen_AU
Files
License bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
Journal Articles