Constraining the evolution of river terraces with integrated OSL and cosmogenic nuclide data

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dc.contributor.authorGuralnik, Ben_AU
dc.contributor.authorMatmon, Aen_AU
dc.contributor.authorAvni, Yen_AU
dc.contributor.authorPorat, Nen_AU
dc.contributor.authorFink, Den_AU
dc.date.accessioned2011-02-03T00:07:22Zen_AU
dc.date.available2011-02-03T00:07:22Zen_AU
dc.date.issued2011-02en_AU
dc.date.statistics2011-02en_AU
dc.description.abstractWe present a framework for consistent incorporation of optically-stimulated luminescence dates with cosmogenic radionuclide concentrations measured in a single alluvial section, and apply it on two late Quaternary terraces in the Negev Desert, Israel, to derive constraints on their evolution. We solve an integrated, self-consistent and co-dependant set of equations to reproduce either dataset based on three model parameters of (i) uniform cosmogenic inheritance, (ii) constant terrace aggradation rate and (iii) subsequent exposure time. A subset of all possible parameter combinations, which approximates the measurements within the uncertainties of their best-fits, yields a better constraint of the alluvial history than that obtained by any of these dating proxies alone. The derived set of common solutions indicates similar paleo-inheritances of ~ 1 × 105 10Be atoms g−1 in both terraces; progressive deposition of the higher terrace (T2) began at ~250 ka, lasted for a period of ~80 ka, was abandoned at ~170 ka and since that time has remained intact; the lower terrace (T1) was most likely deposited at ~3 ka and rapidly abandoned by ~2 ka. In an alternative interpretation for T2, which treats the two geochronometers separately, this terrace might have experienced discrete events of aggradation at (216 ± 13) ka and deep truncation at 118 +42 -29 ka, significantly separated in time. In the currently active channel of the Neqarot canyon, contemporary stripping of the lowest terrace located along the stream is suggested by decreasing values of 10Be downstream along the river channel. © 2010, Elsevier Ltd.en_AU
dc.identifier.citationGuralnik, B., Matmon, A., Avni, Y., Porat, N., & Fink, D. (2011). Constraining the evolution of river terraces with integrated OSL and cosmogenic nuclide data. Quaternary Geochronology, 6(1), 22-32. doi:10.1016/j.quageo.2010.06.002en_AU
dc.identifier.govdoc3177en_AU
dc.identifier.issn1871-1014en_AU
dc.identifier.issue1en_AU
dc.identifier.journaltitleQuaternary Geochronologyen_AU
dc.identifier.pagination22-32en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.quageo.2010.06.002en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/2984en_AU
dc.identifier.volume6en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectBeryllium 10en_AU
dc.subjectRiversen_AU
dc.subjectEvolutionen_AU
dc.subjectIsotopesen_AU
dc.subjectAge estimationen_AU
dc.subjectIsraelen_AU
dc.titleConstraining the evolution of river terraces with integrated OSL and cosmogenic nuclide dataen_AU
dc.typeJournal Articleen_AU
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