Articles | Volume 15, issue 24
https://doi.org/10.5194/bg-15-7451-2018
https://doi.org/10.5194/bg-15-7451-2018
Research article
 | 
21 Dec 2018
Research article |  | 21 Dec 2018

Hydrothermal alteration of aragonitic biocarbonates: assessment of micro- and nanostructural dissolution–reprecipitation and constraints of diagenetic overprint from quantitative statistical grain-area analysis

Laura A. Casella, Sixin He, Erika Griesshaber, Lourdes Fernández-Díaz, Martina Greiner, Elizabeth M. Harper, Daniel J. Jackson, Andreas Ziegler, Vasileios Mavromatis, Martin Dietzel, Anton Eisenhauer, Sabino Veintemillas-Verdaguer, Uwe Brand, and Wolfgang W. Schmahl

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AR: Author's response | RR: Referee report | ED: Editor decision
ED: Publish subject to minor revisions (review by editor) (31 Oct 2018) by Lennart de Nooijer
AR by Laura A. Casella on behalf of the Authors (08 Nov 2018)
ED: Publish as is (16 Nov 2018) by Lennart de Nooijer
AR by Laura A. Casella on behalf of the Authors (25 Nov 2018)
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Short summary
Biogenic carbonates record past environmental conditions. Fossil shell chemistry and microstructure change as metastable biogenic carbonates are replaced by inorganic calcite. Simulated diagenetic alteration at 175 °C of different shell microstructures showed that (nacreous) shell aragonite and calcite were partially replaced by coarse inorganic calcite crystals due to dissolution–reprecipitation reactions. EBSD maps allowed for qualitative assessment of the degree of diagenetic overprint.
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