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Constant cosmogenic nuclide concentrations in sand supplied from the Nile River over the past 2.5 m.y.

Michael Davis, Ari Matmon, Dylan H. Rood and Simona Avnaim-Katav
Constant cosmogenic nuclide concentrations in sand supplied from the Nile River over the past 2.5 m.y.
Geology (Boulder) (March 2012) 40 (4): 359-362


Quartz sand in the eastern Mediterranean coastal plain is supplied through an extended transport system, which includes the Nile River, east Mediterranean longshore currents, and inland eolian transport. While the concentrations of cosmogenic nuclides ( (super 26) Al and (super 10) Be), and their ratio, in modern sand deposited along the coast of the eastern Mediterranean reflect the combined effect of exposure and burial during transport, the concentrations of these nuclides in buried sands are the result of decay of this initial dosing. Samples of modern exposed sand (n = 3) collected from the coastal plain of Israel yield an average (super 26) Al/ (super 10) Be ratio of 4.8+ or -0.2, significantly lower than the expected ratio of 6.8 for exposed quartz grains at the surface. A similar ratio of 4.5+ or -0.3 was measured in a late Pleistocene sand sample, indicating similar exposure-burial histories during transport in spite of the difference in climatic conditions. The results imply a steady, preburial cosmogenic nuclide ratio related to the Nile River's ability, through storage and recycling, to buffer the effects of climatic and tectonic perturbations on cosmogenic nuclide concentrations in the transported quartz. All ancient and buried sand samples (n=11) fall on a decay path that originates from the concentrations and ratio of (super 26) Al and (super 10) Be in modern sand, suggesting steady preburial concentrations of cosmogenic nuclides in quartz sand over the past 2.5 m.y.

ISSN: 0091-7613
EISSN: 1943-2682
Serial Title: Geology (Boulder)
Serial Volume: 40
Serial Issue: 4
Title: Constant cosmogenic nuclide concentrations in sand supplied from the Nile River over the past 2.5 m.y.
Affiliation: Hebrew University of Jerusalem, Institute of Earth Sciences, Jerusalem, Israel
Pages: 359-362
Published: 20120302
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 37
Accession Number: 2012-035897
Categories: Quaternary geologyGeochronology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2012098; accessed on March 22, 2012
Illustration Description: illus. incl. 1 table, sketch map
Source Medium: WWW
N31°00'00" - N33°00'00", E34°00'00" - E37°00'00"
Secondary Affiliation: Lawrence Livermore National Laboratory, USA, United StatesUniversity of Haifa, ISR, Israel
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201219
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