Geothermometry of calcite spar at 10–50 °C
Abstract Carbonate geothermometry is a fundamental tool for quantitative assessment of the geothermal and geochemical evolution of diagenetic and hydrothermal systems, but it remains difficult to obtain accurate and precise formation temperatures of low-temperature calcite samples (below ~ 40 to 60...
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| Format: | Article |
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Nature Portfolio
2024-01-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-024-51937-4 |
| _version_ | 1827377308118286336 |
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| author | Gabriella Koltai Tobias Kluge Yves Krüger Christoph Spötl László Rinyu Philippe Audra Charlotte Honiat Szabolcs Leél-Őssy Yuri Dublyansky |
| author_facet | Gabriella Koltai Tobias Kluge Yves Krüger Christoph Spötl László Rinyu Philippe Audra Charlotte Honiat Szabolcs Leél-Őssy Yuri Dublyansky |
| author_sort | Gabriella Koltai |
| collection | DOAJ |
| description | Abstract Carbonate geothermometry is a fundamental tool for quantitative assessment of the geothermal and geochemical evolution of diagenetic and hydrothermal systems, but it remains difficult to obtain accurate and precise formation temperatures of low-temperature calcite samples (below ~ 40 to 60 °C). Here, we apply three geothermometry methods (∆47-thermometry, nucleation-assisted fluid inclusion microthermometry—hereafter NA-FIM—and oxygen isotope thermometry) to slow-growing subaqueous calcite spar samples to cross-validate these methods down to 10 °C. Temperatures derived by NA-FIM and Δ47-thermometry agree within the 95% confidence interval, except for one sample. Regression analyses suggest that the real uncertainty of ∆47-thermometry exceeds the 1 SE analytical uncertainty and is around ± 6.6 °C for calcite spar that formed at 10–50 °C. The application of δ18O thermometry was limited to a few samples that contained sufficient primary fluid inclusions. It yielded broadly consistent results for two samples with two other geothermometers, and showed higher temperature for the third spar. We also found that calcite with steep rhombohedral morphologies is characteristic of low temperatures (11–13 °C), whereas blunt rhombohedra prevail in the 10–29 °C domain, and the scalenohedral habit dominates > 30 °C. This suggests that the calcite crystal morphology can be used to qualitatively distinguish between low- and higher-temperature calcite. |
| first_indexed | 2024-03-08T12:37:10Z |
| format | Article |
| id | doaj.art-20c2fa7ebf684a33b8bb440b1080e591 |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-03-08T12:37:10Z |
| publishDate | 2024-01-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-20c2fa7ebf684a33b8bb440b1080e5912024-01-21T12:21:30ZengNature PortfolioScientific Reports2045-23222024-01-0114111110.1038/s41598-024-51937-4Geothermometry of calcite spar at 10–50 °CGabriella Koltai0Tobias Kluge1Yves Krüger2Christoph Spötl3László Rinyu4Philippe Audra5Charlotte Honiat6Szabolcs Leél-Őssy7Yuri Dublyansky8Institute of Geology, University of InnsbruckInstitute of Environmental Physics, Heidelberg UniversityDepartment of Earth Science, University of BergenInstitute of Geology, University of InnsbruckIsotope Climatology and Environmental Research Centre (ICER), HUN_REN Institute for Nuclear Research (Atomki)Polytech’Lab-UPR 7498, University of Côte d’AzurInstitute of Geology, University of InnsbruckDepartment of Physical and Applied Geology, Eötvös Loránd UniversityInstitute of Geology, University of InnsbruckAbstract Carbonate geothermometry is a fundamental tool for quantitative assessment of the geothermal and geochemical evolution of diagenetic and hydrothermal systems, but it remains difficult to obtain accurate and precise formation temperatures of low-temperature calcite samples (below ~ 40 to 60 °C). Here, we apply three geothermometry methods (∆47-thermometry, nucleation-assisted fluid inclusion microthermometry—hereafter NA-FIM—and oxygen isotope thermometry) to slow-growing subaqueous calcite spar samples to cross-validate these methods down to 10 °C. Temperatures derived by NA-FIM and Δ47-thermometry agree within the 95% confidence interval, except for one sample. Regression analyses suggest that the real uncertainty of ∆47-thermometry exceeds the 1 SE analytical uncertainty and is around ± 6.6 °C for calcite spar that formed at 10–50 °C. The application of δ18O thermometry was limited to a few samples that contained sufficient primary fluid inclusions. It yielded broadly consistent results for two samples with two other geothermometers, and showed higher temperature for the third spar. We also found that calcite with steep rhombohedral morphologies is characteristic of low temperatures (11–13 °C), whereas blunt rhombohedra prevail in the 10–29 °C domain, and the scalenohedral habit dominates > 30 °C. This suggests that the calcite crystal morphology can be used to qualitatively distinguish between low- and higher-temperature calcite.https://doi.org/10.1038/s41598-024-51937-4 |
| spellingShingle | Gabriella Koltai Tobias Kluge Yves Krüger Christoph Spötl László Rinyu Philippe Audra Charlotte Honiat Szabolcs Leél-Őssy Yuri Dublyansky Geothermometry of calcite spar at 10–50 °C Scientific Reports |
| title | Geothermometry of calcite spar at 10–50 °C |
| title_full | Geothermometry of calcite spar at 10–50 °C |
| title_fullStr | Geothermometry of calcite spar at 10–50 °C |
| title_full_unstemmed | Geothermometry of calcite spar at 10–50 °C |
| title_short | Geothermometry of calcite spar at 10–50 °C |
| title_sort | geothermometry of calcite spar at 10 50 °c |
| url | https://doi.org/10.1038/s41598-024-51937-4 |
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