Dating lacustrine sediments in the central Jordan Valley, Israel: Implications for cosmogenic burial dating

Simple item page
dc.contributor.authorDavis, Men_AU
dc.contributor.authorMatmon, Aen_AU
dc.contributor.authorRon, Hen_AU
dc.contributor.authorFink, Den_AU
dc.contributor.authorNiedermann, Sen_AU
dc.contributor.authorRood, DHen_AU
dc.date.accessioned2012-05-16T06:41:47Zen_AU
dc.date.available2012-05-16T06:41:47Zen_AU
dc.date.issued2011-07-21en_AU
dc.date.statistics2012-05-16en_AU
dc.description.abstractWe apply the cosmogenic two isotope burial method to Pliocene to Pleistocene lacustrine sediments (Erk-El-Ahmar (EEA) formation) in the central Jordan Valley, Israel, in the attempt to extend the applicability of the method to common geological settings in which exposure-burial histories are not well constrained. Previous estimates attributed an age of ~1.8 Ma to the bottom of the EEA formation. 26Al and 10Be concentrations were measured in 11 samples collected from the 170 m tectonically-tilted section. 21Ne concentrations were measured in two of these samples. All samples yielded burial ages that range between 3.5 and 5.3 Ma, much older than the previously estimated age of the EEA formation. All three isotopic pairs (26Al/10Be, 26Al/21Ne, and 10Be/21Ne) yielded similar burial ages within 1?. Samples of identical age that were collected from a specific horizon are presently located at decreasing depths below the surface due to the tectonic tilting. Nevertheless, they yielded identical burial ages suggesting rapid recent erosion in this tectonically active region and insignificant production of cosmogenic isotopes at depth by muons. All samples were found to contain two distinct populations of grains (chert and quartz) mixed at various ratios. These two grain-types were eroded from different sources with significantly different pre-burial exposure histories. The cosmogenic nuclide concentrations in the samples are in accordance with those expected for the mixing of two such sources. Calculations of two-source mixing show that initial 26Al/10Be ratios may be lower relative to the expected surface ratios and result in burial ages overestimated by as much as 500 ka. Our burial ages suggest that the water body that deposited the EEA sediments was contained within the initial topographic depression that formed along the central Jordan Valley segment of the Dead Sea rift. Copyright (c) 2011 INQUA 18en_AU
dc.identifier.citationDavis, M., Matmon, A., Ron, A., Fink, D., Niedermann, S., Rood, D. (2011). Dating lacustrine sediments in the central Jordan Valley, Israel: Implications for cosmogenic burial dating. Presentation to the 18th International Union for Quaternary Research Congress, 21th-27th July 2011, Berne Switzerland.en_AU
dc.identifier.conferenceenddate27 July 2011en_AU
dc.identifier.conferencename18th International Union for Quaternary Research Congressen_AU
dc.identifier.conferenceplaceBerne Switzerlanden_AU
dc.identifier.conferencestartdate21 July 2011en_AU
dc.identifier.govdoc4381en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/4257en_AU
dc.language.isoenen_AU
dc.publisher18th INQUA Congressen_AU
dc.subjectAge estimationen_AU
dc.subjectSedimentsen_AU
dc.subjectIsraelen_AU
dc.subjectSeedsen_AU
dc.subjectIsotopesen_AU
dc.subjectAluminium 26en_AU
dc.subjectBeryllium 10en_AU
dc.titleDating lacustrine sediments in the central Jordan Valley, Israel: Implications for cosmogenic burial datingen_AU
dc.typeConference Presentationen_AU
Files
License bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
license.txt
Size:
1.63 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
Conference Publications