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Portable X‐ray fluorescence spectroscopy as a tool for cyclostratigraphy

Saker-Clark, Matthew; Kemp, David B. and Coe, Angela L. (2019). Portable X‐ray fluorescence spectroscopy as a tool for cyclostratigraphy. Geochemistry, Geophysics, Geosystems, 20(5) pp. 2531–2541.

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DOI (Digital Object Identifier) Link: https://doi.org/10.1029/2018gc007582
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Abstract

Cyclostratigraphic studies are used to create relative and high‐resolution timescales for sedimentary successions based on identification of regular cycles in climate proxy data. This method typically requires the construction of long high‐resolution datasets. In this study, we have demonstrated the efficacy of portable X‐ray fluorescence spectroscopy (pXRF) as a non‐destructive method of generating compositional data for cyclostratigraphy. The rapidity (100 samples per day) and low cost of pXRF measurements provide advantages over relatively time‐consuming and costly elemental and stable isotopic measurements that are commonly used for cyclostratigraphy. The non‐destructive nature of pXRF also allows other geochemical analyses on the same samples. We present an optimized protocol for pXRF elemental concentration measurement in powdered rocks. The efficacy of this protocol for cyclostratigraphy is demonstrated through analysis of 360 Toarcian mudrock samples from North Yorkshire, UK, that were previously shown to exhibit astronomical forcing of [CaCO3], [S] and δ13Corg. Our study is the first to statistically compare the cyclostratigraphic results of pXRF analysis with more established combustion analysis. There are strong linear correlations of pXRF [Ca] with dry combustion elemental analyzer [CaCO3] (r2=0.7616), and pXRF [S] and [Fe] with dry combustion elemental analyzer [S] (r2=0.9632 and r2=0.9274 respectively). Spectral and cross‐spectral analysis demonstrates that cyclicity previously recognized in [S], significant above the 99.99% confidence level, is present above the 99.92% and 99.99% confidence levels in pXRF [S] and [Fe] data respectively. Cyclicity present in [CaCO3] data above the 99.96% confidence level is also present in pXRF [Ca] above the 98.12% confidence level.

Item Type: Journal Item
Copyright Holders: 2019 The Authors
ISSN: 1525-2027
Project Funding Details:
Funded Project NameProject IDFunding Body
CENTA 2017 intakeNE/L002493/1NERC (Natural Environment Research Council)
Astronomical forcing and rapid climate change in the Jurassic. (SE-10-122-AC)NE/I02089X/1NERC (Natural Environment Research Council)
Keywords: pXRF; Toarcian; cyclostratigraphy; Milankovitch
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Environment, Earth and Ecosystem Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 60523
SWORD Depositor: Jisc Publications-Router
Depositing User: Jisc Publications-Router
Date Deposited: 24 Apr 2019 09:25
Last Modified: 21 Aug 2019 06:39
URI: http://oro.open.ac.uk/id/eprint/60523
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