Testing the potential of using coarse-grain feldspars for post-IR IRSL dating of calcium sulphate-wedge growth in the Atacama Desert

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*Title:*	Main Title: Testing the potential of using coarse-grain feldspars for post-IR IRSL dating of calcium sulphate-wedge growth in the Atacama Desert
*Description:*	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.
*Identifier:*	https://doi.org/10.1016/j.quageo.2022.101341 (DOI)

Responsible Party

*Creators:*	Aline Zinelabedin (Author), Svenja Riedesel (Author), Tony Reimann (Author), Benedikt Ritter (Author), Tibor Dunai (Author)
*Publisher:*	Elsevier
*Publication Year:*	2022

Topic

*CRC1211 Topic:*	Surface
*Related Subproject:*	C4
*Subject:*	Keyword: Luminescence Dating

File Details

*Filename:*	1-s2.0-S1871101422000899-main.pdf
*Data Type:*	Data Paper - Publication
*File Size:*	7.3 MB
*Date:*	Accepted: 09.05.2022
*Mime Type:*	application/pdf
*Data Format:*	PDF
*Language:*	English
*Status:*	Completed

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*Download Permission:*	Only Own Subproject
*General Access and Use Conditions:*	According to the CRC1211DB data policy agreement.
*Access Limitations:*	According to the CRC1211DB data policy agreement.
*Licence:*	[CRC1211DB] Data policy agreement

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*Publication Status:*	Accepted
*Review Status:*	Peer reviewed
*Publication Type:*	Article
*Article Type:*	Journal
*Source:*	Quaternary Geochronology
*Volume:*	71
*Number of Pages:*	9 (1 - 9)

Metadata Details

*Metadata Creator:*	Aline Zinelabedin
*Metadata Created:*	30.05.2022
*Metadata Last Updated:*	30.05.2022
*Subproject:*	C4
*Funding Phase:*	2
*Metadata Language:*	English
*Metadata Version:*	V50

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