Scholarlink

<p>Clumped isotope (∆<sub>47</sub>) analyses of foraminifera provide a powerful means to reconstruct upper and bottom water temperatures, independent of seawater δ<sup>18</sup>O and elemental composition. We show statistically significant disequilibrium in the dual (∆<sub>47</sub>-∆<sub>48</sub>) clumped isotope composition of some large benthic foraminifera, while other large benthic foraminifera plot within analytical uncertainty of ∆<sub>47</sub>–∆<sub>48</sub> equilibrium. This deviation suggests the influence of reaction kinetics, such as kinetic effects during CO<sub>2</sub> absorption or a combination of ion attachment/detachment effects at the solution-crystal interface and slight DIC disequilibrium. Measured core-top, planktic and deep-sea benthic foraminifera plot within the 95% confidence level of empirical ∆<sub>47</sub>-∆<sub>48</sub> equilibrium, although additional measurements are required to confidently exclude kinetic ∆<sub>47</sub>-∆<sub>48</sub> bias. Dual clumped isotope measurements of large benthic foraminifera from the Eocene of the Paris and Hampshire basins that conform with ∆<sub>47</sub>-∆<sub>48</sub> equilibrium (95% confidence level) further support existing evidence for surface ocean temperatures ~12–17 °C warmer than today.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Dual clumped isotopes in foraminiferal calcite reveal kinetic bias in some species

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年7月8日

查看全文
  • Amelia Jane Davies,
  • Marion Peral,
  • Jonathan Erez,
  • Adam Levi,
  • David Evans,
  • Oliver Friedrich,
  • Thibaut Caley,
  • Romi Nambiar,
  • Douglas Coenen,
  • Philip Tauxe Staudigel,
  • Mattia Tagliavento,
  • Miguel Bernecker,
  • Jens Fiebig

摘要

Clumped isotope (∆47) analyses of foraminifera provide a powerful means to reconstruct upper and bottom water temperatures, independent of seawater δ18O and elemental composition. We show statistically significant disequilibrium in the dual (∆47-∆48) clumped isotope composition of some large benthic foraminifera, while other large benthic foraminifera plot within analytical uncertainty of ∆47–∆48 equilibrium. This deviation suggests the influence of reaction kinetics, such as kinetic effects during CO2 absorption or a combination of ion attachment/detachment effects at the solution-crystal interface and slight DIC disequilibrium. Measured core-top, planktic and deep-sea benthic foraminifera plot within the 95% confidence level of empirical ∆47-∆48 equilibrium, although additional measurements are required to confidently exclude kinetic ∆47-∆48 bias. Dual clumped isotope measurements of large benthic foraminifera from the Eocene of the Paris and Hampshire basins that conform with ∆47-∆48 equilibrium (95% confidence level) further support existing evidence for surface ocean temperatures ~12–17 °C warmer than today.