Clumped isotope signatures in modern brachiopod carbonate

Rosemarie E. Came*, Uwe Brand, Hagit P. Affek

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

53 Scopus citations

Abstract

We present a temperature to δ47 relationship for naturally occurring modern brachiopods, which was established using a suite of thirteen brachiopod specimens from twelve sampling localities that span a mean annual seawater temperature range of -0.8 to 29.0°C. Sample locations and depths were selected to maximize the range of temperatures covered by the calibration while minimizing the seasonal temperature variability impacting the samples. Linear least-squares regression analysis yields the following relationship expressed using the Ghosh et al. (2006) reference frame:δ47=0.0478±0.0099{dot operator}106/T2+0.1164±0.1203n=13;R2=0.91;95%CI.This equation lies within the 95% confidence interval of the original relationship determined using synthetic calcite (Ghosh et al., 2006), but is in better agreement with the newly revised calibration of Zaarur et al. (2013). However, despite this broad agreement, our equation has a shallower slope than the equations for synthetic calcites, and yields temperatures at the warm end of the calibration temperature range (δ47=0.640‰) that are as much as 3.1°C offset from those predicted using the equation of Zaarur et al. (2013). On the other hand, our new equation has a steeper slope than the Henkes et al. (2013) equation for modern brachiopods and mollusks. This finding is consistent with the hypothesis that differences in the protocols employed by laboratories that use different temperatures of phosphoric acid digestion cause the observed discrepancies between the δ47 values reported by various laboratories.

Original languageAmerican English
Pages (from-to)20-30
Number of pages11
JournalChemical Geology
Volume377
DOIs
StatePublished - 4 Jun 2014
Externally publishedYes

Bibliographical note

Funding Information:
This manuscript was improved greatly by the insightful comments of two anonymous reviewers. We would like to thank L. Colin and P. Colin (Palau) for the field sampling under license RE-12-23 issued by the Bureau of Marine Resources, Republic of Palau, and L. Peck (British Antarctic Survey) for a generous supply of brachiopods from Signy Island. We are grateful for the assistance provided by the members of the Yale Isotope Lab, in particular G. Olack and G. Hunsinger, as well as by John Eiler and the members of the Caltech laboratory. This work was supported by the University of New Hampshire startup funds, NSF grant OCE-1260350 , a Brock University Chancellor's Research Chair award, and NSERC grant 7961 .

Keywords

  • Brachiopods
  • Calibration
  • Clumped isotopes
  • Equilibrium
  • Stable isotopes

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