Temperature dependence of clumped isotopes (∆47) in aragonite

Niels Jonathan de Winter, Rob Witbaard, Ilja Japhir Kocken, Inigo A Müller, Jingjing Guo, Barbara Goudsmit, Martin Ziegler

Research output: Contribution to JournalArticleAcademic

Abstract

Clumped isotope thermometry can independently constrain the formation temperatures of carbonates, but a lack of precisely temperature-controlled calibration samples limits its application on aragonites. To address this issue, we present clumped isotope compositions of aragonitic bivalve shells grown under highly controlled temperatures (1‒18°C), which we combine with clumped isotope data from natural and synthetic aragonites from a wide range of temperatures (1‒850°C). We observe no discernible offset in clumped isotope values between aragonitic foraminifera, mollusks, and abiogenic aragonites or between aragonites and calcites, eliminating the need for a mineral-specific calibration or acid fractionation factor. However, due to non-linear behavior of the clumped isotope thermometer, including high-temperature (>100°C) datapoints in linear clumped isotope calibrations causes them to underestimate temperatures of cold (1‒18°C) carbonates by 2.7 ± 2.0°C (95% confidence level). Therefore, clumped isotope-based paleoclimate reconstructions should be calibrated using samples with well constrained formation temperatures close to those of the samples.
Original languageEnglish
Number of pages25
JournalEarth and Space Science Open Archive
DOIs
Publication statusE-pub ahead of print - 25 Aug 2022
Externally publishedYes

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