Universität zu Köln

Zinelabedin, Aline, Riedesel, Svenja, Reimann, Tony ORCID: 0000-0001-7948-5159, Ritter, Benedikt ORCID: 0000-0002-5652-1169 and Dunai, Tibor J. (2022). Testing the potential of using coarse-grain feldspars for post-IR IRSL dating of calcium sulphate-wedge growth in the Atacama Desert. Quat. Geochronol., 71. OXFORD: ELSEVIER SCI LTD. ISSN 1878-0350

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Abstract

The growth of vertically laminated calcium-sulphate wedges in the Atacama Desert is assumed to be driven by the interaction of moisture supply and salt dynamics in the subsurface. Geochronological data of these wedge laminations is yet sparse but indispensable to resolve wedge-growth phases and episodes of moisture supply and to use these deposits as a palaeoclimate archive in the hyperarid environment. Our pilot study presents a first approach of dating a calcium-sulphate wedge from the Atacama Desert using coarse-grain feldspar luminescence dating. Our results show a widespread and clustered equivalent-dose distribution of two wedge samples from -20 Gy up to saturation. Optically stimulated luminescence (OSL) of quartz revealed unsuitable properties for dating wedge deposits. Consequently, we applied post-infrared infrared stimulated luminescence (post-IR IRSL) to coarse-grained feldspars. Since feldspar single-grain measurements yielded a low number of luminescent grains, we used 1 mm aliquots as reliable single-grain proxies for genuine single-grain measurements. Data from energy-dispersive x-ray spectroscopy (EDX) showed that the feldspar single grains have large differences in their internal K content, resulting in an averaged internal K content of 3.9 +/- 1.0 % for all luminescent grains. This result was subsequently used for dose rate and age calculations. Our results of equivalent-dose distributions and palaeodoses derived from the minimum age model reveal most recent wedge-growth activities at 10.6 +/- 2.2 ka and 7.9 +/- 1.8 ka for the two wedge samples.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Zinelabedin, Aline UNSPECIFIED UNSPECIFIED UNSPECIFIED Riedesel, Svenja UNSPECIFIED UNSPECIFIED UNSPECIFIED Reimann, Tony UNSPECIFIED orcid.org/0000-0001-7948-5159 UNSPECIFIED Ritter, Benedikt UNSPECIFIED orcid.org/0000-0002-5652-1169 UNSPECIFIED Dunai, Tibor J. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-659500
DOI:	10.1016/j.quageo.2022.101341
Journal or Publication Title:	Quat. Geochronol.
Volume:	71
Date:	2022
Publisher:	ELSEVIER SCI LTD
Place of Publication:	OXFORD
ISSN:	1878-0350
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language LUMINESCENCE CHARACTERISTICS; SINGLE; AGE; SEDIMENTS; QUARTZ; RATES Multiple languages Geography, Physical; Geosciences, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/65950