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• W2900219457 abstract "Research Article| November 06, 2018 Quantifying Detection Limits and Uncertainty in X-ray Diffraction Mineralogical Assessments of Biogenic Carbonates Karen L. Vyverberg; Karen L. Vyverberg Department of Geological Sciences, University of Florida, P.O. Box 112120, Gainesville, Florida 32611, U.S.A. Search for other works by this author on: GSW Google Scholar John M. Jaeger; John M. Jaeger Department of Geological Sciences, University of Florida, P.O. Box 112120, Gainesville, Florida 32611, U.S.A. Search for other works by this author on: GSW Google Scholar Andrea Dutton Andrea Dutton Department of Geological Sciences, University of Florida, P.O. Box 112120, Gainesville, Florida 32611, U.S.A. Search for other works by this author on: GSW Google Scholar Author and Article Information Karen L. Vyverberg Department of Geological Sciences, University of Florida, P.O. Box 112120, Gainesville, Florida 32611, U.S.A. John M. Jaeger Department of Geological Sciences, University of Florida, P.O. Box 112120, Gainesville, Florida 32611, U.S.A. Andrea Dutton Department of Geological Sciences, University of Florida, P.O. Box 112120, Gainesville, Florida 32611, U.S.A. e-mail: kvyverberg@gmail.com Publisher: SEPM Society for Sedimentary Geology First Online: 06 Nov 2018 Online Issn: 1938-3681 Print Issn: 1527-1404 Copyright © 2018, SEPM (Society for Sedimentary Geology) Journal of Sedimentary Research (2018) 88 (11): 1261–1275. https://doi.org/10.2110/jsr.2018.63 Article history First Online: 06 Nov 2018 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Karen L. Vyverberg, John M. Jaeger, Andrea Dutton; Quantifying Detection Limits and Uncertainty in X-ray Diffraction Mineralogical Assessments of Biogenic Carbonates. Journal of Sedimentary Research 2018;; 88 (11): 1261–1275. doi: https://doi.org/10.2110/jsr.2018.63 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyJournal of Sedimentary Research Search Advanced Search Abstract Mineralogical assessments of carbonates are widely used in environmental and diagenetic studies as well as to identify well-preserved archives for the reconstruction of past climate. Efforts to improve the quantification of phases in biogenic carbonates are ongoing and critical to accurately interpreting paleoclimate data. X-ray diffraction (XRD) is a standard quantitative mineralogical tool for many applications, but previous studies vary in their precision and determination of errors. Here we present a quantitative bimodal XRD calibration of marine, biogenic carbonates that we developed to assess the relative amounts of aragonite, low-Mg calcite, and high-Mg calcite in fossil coral samples. We compare the accuracy and precision of an ordinary-least-squares and a weighted-least-squares regression technique for low-concentration standard mixtures, and extend this comparison to two other published calibration studies. We also compare a polynomial fit and a spline fit for an overall calibration regression. The calibrations in this study are then compared with a model calibration using synthetic XRD data to test for sources of bias and uncertainty in the experimental calibrations. This test leads us to conclude that variation in the grain size and crystallinity of a natural aragonite standard is one source of uncertainty in these calibrations. Reproducibility of standard peak-area ratios has the largest control on calibration precision and limits of decision, detection, and quantification. Calibration accuracy is determined by the slope of the model regressions, which may be influenced by a number of factors, including mineralogical-standard crystallinity. Based on these results we include a set of best practices for XRD calibration procedures that are dependent on the carbonate phase and precision requirements of the end-user's sample assessment. This method is made available and reproducible with an open-source R programming language code in GitHub and represents a robust procedure for bimodal quantitative mineralogical assessment in biogenic carbonates, with wide-ranging applications to environmental studies. You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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• W2900219457 date "2018-11-06" @default.
• W2900219457 modified "2023-09-30" @default.
• W2900219457 title "Quantifying Detection Limits and Uncertainty in X-ray Diffraction Mineralogical Assessments of Biogenic Carbonates" @default.
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• W2900219457 doi "https://doi.org/10.2110/jsr.2018.63" @default.
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