Articles | Volume 19, issue 16
https://doi.org/10.5194/bg-19-3791-2022
https://doi.org/10.5194/bg-19-3791-2022
Research article
 | 
22 Aug 2022
Research article |  | 22 Aug 2022

Experimental burial diagenesis of aragonitic biocarbonates: from organic matter loss to abiogenic calcite formation

Pablo Forjanes, María Simonet Roda, Martina Greiner, Erika Griesshaber, Nelson A. Lagos, Sabino Veintemillas-Verdaguer, José Manuel Astilleros, Lurdes Fernández-Díaz, and Wolfgang W. Schmahl

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This preprint is open for discussion and under review for Biogeosciences (BG).
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Cited articles

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Astilleros, J. M., Pina, C. M., Fernández-Diaz, L., and Putnis, A.: Metastable phenomena on calcite {1014} surfaces growing from Sr2+Ca2+CO32- aqueous solutions, Chem. Geol., 193, 93–107, 2003. 
Astilleros, J. M., Fernández-Díaz, L., and Putnis, A.: The role of magnesium in the growth of calcite: An AFM study, Chem. Geol., 271, 52–58, 2010. 
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Bénézeth, P., Palmer, D. A., and Wesolowski, D. J.: Dissociation quotients for citric acid in aqueous sodium chloride media to 150 C, J. Solution Chem., 26, 63–84, 1997. 
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Aragonitic skeletons are employed to decipher past climate dynamics and environmental change. Unfortunately, the information that these skeletons keep can be destroyed during diagenesis. In this work, we study the first changes undergone by aragonitic skeletons upon hydrothermal alteration. We observe that major changes occur from the very beginning of the alteration, even without mineralogical changes. These results have major implications for the use of these archives to understand the past.
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