Articles | Volume 14, issue 6
https://doi.org/10.5194/bg-14-1461-2017
https://doi.org/10.5194/bg-14-1461-2017
Research article
 | 
24 Mar 2017
Research article |  | 24 Mar 2017

Experimental diagenesis: insights into aragonite to calcite transformation of Arctica islandica shells by hydrothermal treatment

Laura A. Casella, Erika Griesshaber, Xiaofei Yin, Andreas Ziegler, Vasileios Mavromatis, Dirk Müller, Ann-Christine Ritter, Dorothee Hippler, Elizabeth M. Harper, Martin Dietzel, Adrian Immenhauser, Bernd R. Schöne, Lucia Angiolini, and Wolfgang W. Schmahl

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Cited articles

Balthasar, U. and Cusack, M.: Aragonite-calcite seas – Quantifying the gray area, Geology, 43, 99–102, 2015.
Bathurst, R. G. C.: Neomorphic processes in diagenesis, in: Carbonate sediments and their diagenesis, edited by: Bathurst, R. G. C., 7th Edn., Elsevier, Amsterdam, 475–516, 1994.
Berner, R. A.: The role of magnesium in the crystal growth of calcite and aragonite from sea water, Geochim. Cosmochim. Ac., 39, 489–504, 1975.
Bischoff, J. L. and Fyfe, W. S.: Catalysis, inhibition, and the calcite-aragonite problem, Part 1, The aragonite-calcite transformation, Am. J. Sci., 266, 65–79, 1968.
Bischoff, J. L.: Kinetics of calcite nucleation: magnesium ion inhibition and ionic strength catalysis, J. Geophys. Res., 73, 3315–3322, 1968.
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Short summary
Mollusc shells record past environments. Fossil shell chemistry and microstructure change as metastable biogenic aragonite transforms to stable geogenic calcite. We simulated this alteration of Arctica islandica shells by hydrothermal treatments. Below 175 °C the shell aragonite survived for weeks. At 175 °C the replacement of the original material starts after 4 days and yields submillimetre-sized calcites preserving the macroscopic morphology as well as the original internal micromorphology.
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