Mineral authigenesis within chemosynthetic microbial mats

Author(s)
Jennifer Zwicker, Daniel Smrzka, Florian Steindl, Michael E. Böttcher, Eugen Libowitzky, Steffen Kiel, Jörn Peckmann
Abstract

Marine hydrocarbon seeps are sites of chemosynthetic microbial activity and authigenic carbonate formation. Seep limestones are typified by a range of geochemical signatures of microbial hydrocarbon oxidation, but only few seep deposits reveal mesofabrics that can be regarded as evidence of microbial activity. A Cretaceous methane‐seep limestone from Waipiro Bay, New Zealand, exhibits a fabric composed of cryptocrystalline carbonate fluorapatite between carbonate coated grains and spheroidal calcite. To understand the unusual Waipiro deposit, a paragenetic sequence has been derived for coated grains, spheroidal calcite and carbonate fluorapatite using thin section petrography, scanning electron microscopy, Fourier‐transform infrared spectroscopy and stable isotope geochemistry. The formation of 13C‐depleted coated grains (δ13C values as low as −15.8‰ Vienna‐Pee Dee Belemnite) and spheroidal calcite (δ13C values as low as −21.3‰) was favoured by hydrocarbon oxidation. Fibrous banded and botryoidal cement, a typical early diagenetic phase of hydrocarbon‐seep deposits, features δ13C values as low as −22.9‰. Coated grains and spheroidal calcite grew by displacive growth in a gel‐like medium, probably a microbial mat. Phosphorus is a mobile element and marine pore waters are typically undersaturated with respect to carbonate fluorapatite. Specific conditions are consequently required to retain sufficient concentrations to precipitate carbonate fluorapatite. Possible sources of phosphorus for the formation of the 13C‐depleted Waipiro carbonate fluorapatite (mean δ13C value of −15.4‰) include (a) the oxidation of sedimentary organic matter by organoclastic sulphate reduction, (b) the degradation of the microbial mat itself and (c) the active release of polyphosphate by sulphide‐oxidizing bacteria. This study suggests that the formation of the Cretaceous Waipiro seep limestone involved an interplay of biogeochemical processes including sulphate‐driven anaerobic oxidation of methane, organoclastic sulphate reduction and possibly nitrate‐dependent sulphide oxidation. It further demonstrates that coated grains resembling oncoids are not restricted to shallow water, photosynthesis‐dependent ecosystems.

Organisation(s)
Department of Geology, Department of Mineralogy and Crystallography
External organisation(s)
Technische Universität Graz, Swedish Museum of Natural History, Leibniz-Institut für Ostseeforschung, Universität Hamburg, Ernst Moritz Arndt Universität Greifswald, Universität Rostock
Journal
The Depositional Record
Volume
7
Pages
294-310
No. of pages
17
ISSN
2055-4877
DOI
https://doi.org/10.1002/dep2.123
Publication date
08-2020
Peer reviewed
Yes
Austrian Fields of Science 2012
105128 Geomicrobiology, 105105 Geochemistry, 105121 Sedimentology
Keywords
ASJC Scopus subject areas
Environmental Science (miscellaneous), Geology, Oceanography, Palaeontology, Stratigraphy
Sustainable Development Goals
SDG 14 - Life Below Water
Portal url
https://ucris.univie.ac.at/portal/en/publications/mineral-authigenesis-within-chemosynthetic-microbial-mats(36cacc3a-0a1e-41cf-bda8-24b001655f25).html