ANSTO Publications Online >
Journal Publications >
Journal Articles >

Please use this identifier to cite or link to this item: http://apo.ansto.gov.au/dspace/handle/10238/2984

Title: Constraining the evolution of river terraces with integrated OSL and cosmogenic nuclide data.
Authors: Guralnik, B
Matmon, A
Avni, Y
Porat, N
Fink, D
Keywords: Beryllium 10
Rivers
Evolution
Isotopes
Age Estimation
Israel
Issue Date: Feb-2011
Publisher: Elsevier
Citation: Guralnik, 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.
Abstract: We 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.
URI: http://dx.doi.org/10.1016/j.quageo.2010.06.002
http://apo.ansto.gov.au/dspace/handle/10238/2984
ISSN: 1871-1014
Appears in Collections:Journal Articles

Files in This Item:

There are no files associated with this item.

Items in APO are protected by copyright, with all rights reserved, unless otherwise indicated.

 

Valid XHTML 1.0! DSpace Software Copyright © 2002-2010  Duraspace - Feedback