Multi-isotopic and trace element evidence against different formation pathways for oyster microstructures

A new age model and chemostratigraphic framework for the Maastrichtian type area (southeastern Netherlands, northeastern Belgium)

“…This integration time was selected to allow the Time of Stable Reproducibility and Time of Stable Accuracy to be reached, which allows the concentration of a range of elements to be quantified (de . The resulting XRF spectra were quantified using a matrix corrected Fundamental Parameters method (de Winter and Claeys 2017) and then calibrated following the procedures outlined in De Winter et al (2021). This multi-standard calibration used repeated μXRF spotanalysis on a set of 10 carbonate certified reference materials: CRM393 (Bureau of Analyzed Samples Ltd, Middlesbrough, UK; BAS), CRM512 (BAS), CRM513 (BAS), ECRM782 (BAS), CCH1 (Université de Liège, Belgium), COQ1 (United States Geological Survey, Denver, CO, USA), SRM1d (National Institute of Standards and Technology, Gaithersburg, MD, USA), NIM-GBW07108 (China National Analysis Center for Iron and Steel, Beijing, China; NCS), NIM-GBW07714 (NCS) and NIM-GBW07717 (NCS).…”

Temperature Dependence of Clumped Isotopes (∆47) in Aragonite

“…islandica shells offer more control on formation temperature than naturally grown carbonates precipitated under variable temperatures. Ideally, the temperature of these natural samples is monitored so an average temperature can be calculated for the targeted growth period (e.g., de Winter et al., 2020 , de Winter, Dämmer et al., 2021 ; Huyghe et al., 2022 ; Kele et al., 2015 ). However, formation temperatures are often indirectly estimated through other proxies (e.g., δ 18 O c ) and/or estimates of the living environment (e.g., water depth) of the carbonate producer, accumulating uncertainty (e.g., Meinicke et al., 2020 ; Peral et al., 2018 ; Piasecki et al., 2019 ).…”

“…Our lab-grown A. islandica shells offer more control on formation temperature than naturally grown carbonates precipitated under variable temperatures. Ideally, the temperature of these natural samples is monitored so an average temperature can be calculated for the targeted growth period (e.g., de Winter et al, 2020, de Winter, Dämmer et al, 2021Huyghe et al, 2022;Kele et al, 2015). However, formation temperatures are often indirectly estimated DE WINTER ET AL.…”

Experimental Constraints on Clumped Isotope Fractionation During BaCO3 Precipitation

“…For example, modern seep carbonates exhibit anomalously low Δ 47 values, possibly due to rapid carbonate precipitation (Loyd et al, 2016;Thiagarajan et al, 2020). de Winter et al (2021) found that the chalky microstructures of the oyster shells with high growth rates show lower Δ 47 values compared with the foliated microstructure with low growth rates. Herlambang and John (2021) applied trace-element partitioning in constraining the precipitation rate of natural calcites and found that samples with higher precipitation rates have lower Δ 47 values.…”