Biogeosciences, 17, 2085–2106, 2020 https://doi.org/10.5194/bg-17-2085-2020 © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License. Authigenic formation of Ca–Mg carbonates in the shallow alkaline Lake Neusiedl, Austria Dario Fussmann1, Avril Jean Elisabeth von Hoyningen-Huene2, Andreas Reimer1, Dominik Schneider2, Hana Babková3, Robert Peticzka4, Andreas Maier4, Gernot Arp1, Rolf Daniel2, and Patrick Meister3 1Geobiology, Geoscience Centre, Georg-August-Universität Göttingen, Goldschmidtstraße 3, 37077 Göttingen, Germany 2Genomic and Applied Microbiology and Göttingen Genomics Laboratory, Institute of Microbiology and Genetics, Georg-August-Universität Göttingen, Grisebachstraße 8, 37077 Göttingen, Germany 3Department of Geodynamics and Sedimentology, University of Vienna, Althanstraße 14, 1090 Vienna, Austria 4Department of Geography and Regional Research, University of Vienna, Althanstraße 14, 1090 Vienna, Austria Correspondence: Dario Fussmann (
[email protected]) Received: 15 November 2019 – Discussion started: 5 December 2019 Revised: 18 February 2020 – Accepted: 11 March 2020 – Published: 16 April 2020 Abstract. Despite advances regarding the microbial and the sediment of Lake Neusiedl. As a consequence, precipi- organic-molecular impact on nucleation, the formation of tation of high-magnesium calcite (HMC) and protodolomite dolomite in sedimentary environments is still incompletely does not occur in association with anoxic sediment and understood. Since 1960, apparent dolomite formation has sulfate-reducing conditions. Instead, analytical data for Lake been reported from mud sediments of the shallow, oligoha- Neusiedl suggest that authigenic HMC and protodolomite line and alkaline Lake Neusiedl, Austria. To trace potential precipitate from the supersaturated, well-mixed aerobic wa- dolomite formation or diagenetic alteration processes in its ter column.