Maturing cutting-edge luminescence-based inventories for measuring vertical upper ECZ particle fluxes and for dating the exposure of typical Atacama Desert soils and surfaces

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Title:Main Title: Maturing cutting-edge luminescence-based inventories for measuring vertical upper ECZ particle fluxes and for dating the exposure of typical Atacama Desert soils and surfaces
Description:Series Information: The central Atacama Desert is generally considered the driest place on Earth. Given the fog-related moisture availability along the north Chilean Coastal Cordillera and the increasing precipitation to-wards the Andean Cordillera, it is an ideal area to explore the transition of biotically to abiotically driven processes in the Earth’s Critical Zone (ECZ). For this purpose, luminescence dating techniques have elsewhere proven to be a powerful tool in the recent past [e.g., Reimann et al., 2017]; nonethe-less, a previous study testing the applicability of luminescence dating on coarse grain feldspars from the Atacama Desert found highly variable K-contents (0.67 - 11.17 % K2O) within each sample and below 1 % of the measured feldspar grains gave a post-infrared infrared stimulated luminescence (pI-RIRSL) signal suitable for dating [Zinelabedin et al., 2022]. Single-grain luminescence dating has successfully been applied to infer sediment transport and mixing processes in various geological settings [e.g., Reimann et al., 2017]. However, in some regions, like the Atacama Desert, single-grain luminescence dating can be challenging and time consuming, particularly when only a small percentage of grains emits luminescence. In such cases many individual grains need to be measured before a sufficient number of grains has been obtained to calculate a robust palaeodose. It has been shown that establishing a standardised growth curve (SGC) for single-grain feldspar pIRIRSL measurements reduces the measurement time considerably [Li et al., 2018] and that SGCs are suitable for feldspars with unfavourable luminescence properties and a complex mineralogy [Sontag-González et al., 2021]. Here we test the applicability of SGCs for single-grain pIRIRSL age determination of Atacama De-sert feldspars to investigate small-scale geomorphological processes in the Atacama Desert. In addition to five samples from the Atacama Desert, we include five chemically and structurally different feldspar sediment extracts from various geological origins to test the effect of the sample chemistry on SGC behaviour. By performing a dose recovery test (pIRIRSL175) on all samples, we gained a test dataset for SGC calculations. To enable a comparison of individual dose response curve behaviour with sample chemistry we constrained the major element chemistry of each grain measured using energy-dispersive x-ray spectroscopy (0,08 – 16,84 % K2O). We establish three SGCs, one for the entire dataset and ei-ther one for Atacama Desert and non-Atacama Desert samples. The SGC performances are tested by applying them to the dose recovery test data of the Atacama Desert samples and compare the thereby computed equivalent dose (De) estimates to the conventionally calculated De estimates. The success-fully refined and established SGC method is applied to samples, collected along two climatic transects in the Atacama Desert. Keywords: potassium feldspar, standardised growth curve, single-grain, pIRIRSL, potassium-content References 1. Reimann, T., Román-Sánchez, A., Vanwalleghem, T., Wallinga, J., 2017. Getting a grip on soil reworking – Single-grain feldspar luminescence as a novel tool to quantify soil reworking rates. Quaternary Geo-chronology 42, 1–14. 2. Li, B., Roberts, R.G., Jacobs, Z., Roberts, R.G., Li, S.H., 2018. Single-grain dating of potassium-rich feld-spar grains: Towards a global standardised growth curve for the post-IR IRSL signal. Quaternary Geo-chronology 45, 23–36. 3. Sontag-González, M., Li, B., O’Gorman, K., Sutikna, T., Jatmiko, Jacobs, Z., Roberts, R.G., 2021. Estab-lishing a pIRIR procedure for De determination of composite mineral grains from volcanic terranes: A case study of sediments from Liang Bua, Indonesia. Quaternary Geochronology 65, 101181. 4. Zinelabedin, A., Riedesel, S., Reimann, T., Ritter, B., Dunai, T.J., 2022. Testing the potential of using coarse-grain feldspars for post-IR IRSL dating of calcium sulphate-wedge growth in the Atacama Desert. Quaternary Geochronology 71, 101341.
Responsible Party
Creators:Linda Maßon (Author), Svenja Riedesel (Author), Anja Zander (Author), Mariana Sontag-González (Author), Matthias May (Author), Marijn Van Der Meij (Author), Tony Reimann (Principal Investigator)
Publisher:CRC1211 Database (CRC1211DB)
Publication Year:2023
Topic
CRC1211 Topic:Dating
Related Subproject:C8
Subjects:Keywords: Luminescence Dating, Geochronology
File Details
Filename:Poster_groessere_Schrift_V3_x-1a2003.pdf
Data Type:Other - Poster
File Size:114.3 MB
Date:Other: 30.11.2023 (Presented)
Mime Type:application/pdf
Data Format:PDF
Language:English
Status:Completed
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Download Permission:Only Project Members
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
Geographic
Specific Information - Presentation
Presenter:Linda Maßon
Presentation Date:30th of November, 2023
Presentation Type:Poster
Event:XVI Congreso Geológico Chileno
Event Type:Conference
Event Location:Santiago Chile
Event Duration:26th of November, 2023 - 1st of December, 2023
Event Website:https://congresogeologicochileno.cl/
Metadata Details
Metadata Creator:Lina Maßon
Metadata Created:01.12.2023
Metadata Last Updated:01.12.2023
Subproject:C8
Funding Phase:2
Metadata Language:English
Metadata Version:V50
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