OSL dating of a Pleistocene maar: Birket Ram, the Golan heights

Shaanan, Uri, Porat, Naomi, Navon, Oded, Weinberger, Ram, Calvert, Andrew and Weinstein, Yishai (2011) OSL dating of a Pleistocene maar: Birket Ram, the Golan heights. Journal of Volcanology and Geothermal Research, 201 1-4: 397-403. doi:10.1016/j.jvolgeores.2010.06.007


Author Shaanan, Uri
Porat, Naomi
Navon, Oded
Weinberger, Ram
Calvert, Andrew
Weinstein, Yishai
Title OSL dating of a Pleistocene maar: Birket Ram, the Golan heights
Journal name Journal of Volcanology and Geothermal Research   Check publisher's open access policy
ISSN 0377-0273
1872-6097
Publication date 2011-04-15
Year available 2010
Sub-type Article (original research)
DOI 10.1016/j.jvolgeores.2010.06.007
Open Access Status Not yet assessed
Volume 201
Issue 1-4
Start page 397
End page 403
Total pages 7
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Language eng
Formatted abstract
Direct dating of maars and their phreatomagmatic deposits is difficult due to the dominance of lithic (host rock) fragments and glassy particles of the juvenile magma. In this paper we demonstrate that optically stimulated luminescence (OSL) dating can be successfully used for age determination of phreatomagmatic deposits. We studied the tuff deposit of Birket Ram, a basanitic maar located at the northern edge of the Golan heights on the western Arabian plate. The maar is underlain by a thick section of Pleistocene basalts, and currently hosts a small lake. It is filled by approximately 90m of lacustrine sediments with radiocarbon ages extrapolated to 108ka at the base. OSL was applied to quartz grains extracted from tuffs and paleosols in order to set the time frame of the phreatomagmatism at the site. A maximum age constraint of 179±13ka was determined for a paleosol that underlies the maar ejecta. Quartz grains from two layers in the tuff section yielded a direct age of 129±6ka for the phreatomagmatic eruption. A younger age of 104±7ka, which was determined for a tuff layer underlying a basaltic flow, was attributed to thermal resetting during the lava emplacement. This was confirmed by an 40Ar/39Ar age of 101±3ka determined on the overlying basalt. The internal consistency of the OSL ages and the agreement with the 40Ar/39Ar age determination as well as with previous estimates demonstrates the potential of OSL for maar dating.
Keyword 40Ar/39Ar
Geochronology
Golan
Maar
OSL dating
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Earth Sciences Publications
 
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