Articles | Volume 15, issue 24
Biogeosciences, 15, 7451–7484, 2018
https://doi.org/10.5194/bg-15-7451-2018
Biogeosciences, 15, 7451–7484, 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 et al.

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Cited articles

Addadi, L., Joester, D., Nudelman, F., and Weiner, S.: Mollusk shell formation: a source of new concepts for understanding biomineralization processes, Chemistry, 12, 980–987, 2006.
Allison, N., Finch, A. A., Webster, J. M., and Clague, D. A.: Palaeoenvironmental records from fossil corals: the effects of submarine diagenesis on temperature and climate estimates, Geochim. Cosmochim. Ac., 71, 4693–4703, 2007.
Altree-Williams, A., Pring, A., Ngothai, Y., and Brugger, J.: Textural and compositional complexities resulting from coupled dissolution-reprecipitation reactions in geomaterials, Earth-Sci. Rev., 150, 628–651, 2015.
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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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