Isotopic and mineralogic bias introduced by pulverization of aragonite
Rationale Stable carbon and oxygen isotope data of biogenic and abiogenic aragonite are of fundamental relevance in paleoclimate research. Wet‐chemical analysis of such materials requires well‐homogenized, fine‐grained powder. In the present study, the effect of different grinding/milling methods on...
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crwiley:10.1002/rcm.9842 2024-09-15T17:54:29+00:00 Isotopic and mineralogic bias introduced by pulverization of aragonite Schmitt, Katharina E. Fink, Laura J. Jantschke, Anne Vigelius, Daniel Schöne, Bernd R. 2024 http://dx.doi.org/10.1002/rcm.9842 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Rapid Communications in Mass Spectrometry volume 38, issue 17 ISSN 0951-4198 1097-0231 journal-article 2024 crwiley https://doi.org/10.1002/rcm.9842 2024-09-05T05:05:27Z Rationale Stable carbon and oxygen isotope data of biogenic and abiogenic aragonite are of fundamental relevance in paleoclimate research. Wet‐chemical analysis of such materials requires well‐homogenized, fine‐grained powder. In the present study, the effect of different grinding/milling methods on sample homogeneity and the potential risk of unintentional calcite formation and isotope shift were evaluated. Methods Shells of Arctica islandica and aragonite sputnik crystals were pulverized using a set of commonly used methods, including a hand‐held drill, a vibromill operated at various settings (with and without liquid nitrogen cooling, changes in ball diameters, frequencies, and processing durations), and an agate mortar and pestle. Stable isotope values were measured using an isotope ratio mass spectrometer operated in continuous flow mode. Identification of mineral phases was obtained by powder X‐ray diffraction (PXRD), Raman spectroscopy, and attenuated total reflectance‐Fourier transform infrared (ATR‐FTIR) spectroscopy. Calcite content was quantified by PXRD Rietveld refinement. Results Samples showed substantial homogeneity, in particular after vibromilling (duration 3–10 min). More vigorous grinding resulted in larger fractions of calcite (0.5–4.2 wt%) and a concomitant δ 18 O and δ 13 C decrease, specifically in bivalve shells. The only method for producing pure aragonite powder was by pounding the aragonite sputniks manually with an agate mortar and pestle. Conclusions None of the studied, commonly used machine‐based pulverization methods produced pure aragonite powder from samples consisting originally of aragonite. These findings have significant implications for light‐stable isotope‐based paleoclimate reconstructions. Except for abiogenic aragonite powder produced by pounding in an agate mortar, paleotemperatures would be overestimated. Article in Journal/Newspaper Arctica islandica Wiley Online Library Rapid Communications in Mass Spectrometry 38 17 |
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Open Polar |
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Wiley Online Library |
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English |
description |
Rationale Stable carbon and oxygen isotope data of biogenic and abiogenic aragonite are of fundamental relevance in paleoclimate research. Wet‐chemical analysis of such materials requires well‐homogenized, fine‐grained powder. In the present study, the effect of different grinding/milling methods on sample homogeneity and the potential risk of unintentional calcite formation and isotope shift were evaluated. Methods Shells of Arctica islandica and aragonite sputnik crystals were pulverized using a set of commonly used methods, including a hand‐held drill, a vibromill operated at various settings (with and without liquid nitrogen cooling, changes in ball diameters, frequencies, and processing durations), and an agate mortar and pestle. Stable isotope values were measured using an isotope ratio mass spectrometer operated in continuous flow mode. Identification of mineral phases was obtained by powder X‐ray diffraction (PXRD), Raman spectroscopy, and attenuated total reflectance‐Fourier transform infrared (ATR‐FTIR) spectroscopy. Calcite content was quantified by PXRD Rietveld refinement. Results Samples showed substantial homogeneity, in particular after vibromilling (duration 3–10 min). More vigorous grinding resulted in larger fractions of calcite (0.5–4.2 wt%) and a concomitant δ 18 O and δ 13 C decrease, specifically in bivalve shells. The only method for producing pure aragonite powder was by pounding the aragonite sputniks manually with an agate mortar and pestle. Conclusions None of the studied, commonly used machine‐based pulverization methods produced pure aragonite powder from samples consisting originally of aragonite. These findings have significant implications for light‐stable isotope‐based paleoclimate reconstructions. Except for abiogenic aragonite powder produced by pounding in an agate mortar, paleotemperatures would be overestimated. |
format |
Article in Journal/Newspaper |
author |
Schmitt, Katharina E. Fink, Laura J. Jantschke, Anne Vigelius, Daniel Schöne, Bernd R. |
spellingShingle |
Schmitt, Katharina E. Fink, Laura J. Jantschke, Anne Vigelius, Daniel Schöne, Bernd R. Isotopic and mineralogic bias introduced by pulverization of aragonite |
author_facet |
Schmitt, Katharina E. Fink, Laura J. Jantschke, Anne Vigelius, Daniel Schöne, Bernd R. |
author_sort |
Schmitt, Katharina E. |
title |
Isotopic and mineralogic bias introduced by pulverization of aragonite |
title_short |
Isotopic and mineralogic bias introduced by pulverization of aragonite |
title_full |
Isotopic and mineralogic bias introduced by pulverization of aragonite |
title_fullStr |
Isotopic and mineralogic bias introduced by pulverization of aragonite |
title_full_unstemmed |
Isotopic and mineralogic bias introduced by pulverization of aragonite |
title_sort |
isotopic and mineralogic bias introduced by pulverization of aragonite |
publisher |
Wiley |
publishDate |
2024 |
url |
http://dx.doi.org/10.1002/rcm.9842 |
genre |
Arctica islandica |
genre_facet |
Arctica islandica |
op_source |
Rapid Communications in Mass Spectrometry volume 38, issue 17 ISSN 0951-4198 1097-0231 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1002/rcm.9842 |
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Rapid Communications in Mass Spectrometry |
container_volume |
38 |
container_issue |
17 |
_version_ |
1810430807825711104 |