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Building on previous OSL dating techniques for gypsum: a case study from Salt Basin playa, New Mexico and Texas

Quaternary Geochronology

By:
and
DOI: 10.1016/j.quageo.2012.02.001

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Abstract

The long term stability and reliability of the luminescence signal for gypsum has not been well documented or systematically measured until just recently. A review of the current literature for luminescence dating of gypsum is compiled here along with original efforts at dating an intact and in-situ bed of selenite gypsum at Salt Basin Playa, New Mexico and Texas. This effort differs from other documented luminescence dating efforts because the gypsum is not powdery or redistributed from its original growth patterns within the playa basin but is instead of a crystalline form. Sixteen ages from eight cores were ultimately produced with seven of the ages coming from rare detrital quartz encased in or with the gypsum crystals while the remaining ages are from the crystalline gypsum. As far as can be ascertained, the quartz was measured separately from the gypsum and no contaminants were noted in any of the aliquots. Some basic and preliminary tests of signal stability were measured and found to be mitigated by lessening of pre-heat protocols. Ages ranged from 8 ka to 10 ka in the shallow cores and 16 ka to 22 ka in the deeper cores. These ages will be useful in determining rates of gypsum growth within a sequence of evaporates which, in turn, will help to better document historic rates of evaporation and thus estimate, with more precision, the corresponding annual evaporation rates.

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Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Building on previous OSL dating techniques for gypsum: a case study from Salt Basin playa, New Mexico and Texas
Series title:
Quaternary Geochronology
DOI:
10.1016/j.quageo.2012.02.001
Volume
10
Year Published:
2012
Language:
English
Publisher:
Elsevier
Contributing office(s):
Crustal Geophysics and Geochemistry Science Center
Description:
8 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Quaternary Geochronology
First page:
345
Last page:
352
Country:
United States
City:
Texas;New Mexico