| Autor: |
Niels J, de Winter, Rob, Witbaard, Ilja J, Kocken, Inigo A, Müller, Jingjing, Guo, Barbara, Goudsmit, Martin, Ziegler |
| Rok vydání: |
2022 |
| Zdroj: |
Geophysical research letters. 49(20) |
| ISSN: |
0094-8276 |
| Popis: |
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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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