loading page

Temperature dependence of clumped isotopes (∆47) in aragonite
  • +5
  • Niels Jonathan de Winter,
  • Rob Witbaard,
  • Ilja Japhir Kocken,
  • Inigo A Müller,
  • Jingjing Guo,
  • Barbara Goudsmit,
  • Martin Ziegler,
  • Niels Jonathan de Winter
Niels Jonathan de Winter
Vrije Universiteit Brussel

Corresponding Author:[email protected]

Author Profile
Rob Witbaard
Royal Netherlands Institute for Sea Research, Royal Netherlands Institute for Sea Research
Author Profile
Ilja Japhir Kocken
Utrecht University, Utrecht University
Author Profile
Inigo A Müller
Université de Genève, Université de Genève
Author Profile
Jingjing Guo
Utrecht University, Utrecht University
Author Profile
Barbara Goudsmit
Royal Netherlands Institute for Sea Research, Royal Netherlands Institute for Sea Research
Author Profile
Martin Ziegler
Utrecht University, Utrecht University
Author Profile
Niels Jonathan de Winter
Vrije Universiteit Amsterdam

Corresponding Author:[email protected]

Author Profile

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 deg C), which we combine with clumped isotope data from aragonites precipitated in a wide range of temperatures (1‒850 deg C). We observe no offset in clumped isotope values between aragonitic foraminifera, mollusks, and abiogenic aragonites or between aragonites and calcites, eliminating the need for 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 deg C) datapoints in linear clumped isotope calibrations causes them to underestimate temperatures of cold (1‒18 deg C) carbonates by 2.7 +/- 2.0 deg 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.