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  • Zwicker, JenniferDepartment für Geodynamik und Sedimentologie Universität Wien Wien Austria (författare)

Mineral authigenesis within chemosynthetic microbial mats: Coated grain formation and phosphogenesis at a Cretaceous hydrocarbon seep, New Zealand

  • Artikel/kapitelEngelska2021

Förlag, utgivningsår, omfång ...

  • 2020-08-28
  • John Wiley & Sons,2021
  • printrdacarrier

Nummerbeteckningar

  • LIBRIS-ID:oai:DiVA.org:nrm-4376
  • https://urn.kb.se/resolve?urn=urn:nbn:se:nrm:diva-4376URI
  • https://doi.org/10.1002/dep2.123DOI

Kompletterande språkuppgifter

  • Språk:engelska
  • Sammanfattning på:engelska

Ingår i deldatabas

Klassifikation

  • Ämneskategori:ref swepub-contenttype
  • Ämneskategori:art swepub-publicationtype

Anmärkningar

  •  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. 

Ämnesord och genrebeteckningar

Biuppslag (personer, institutioner, konferenser, titlar ...)

  • Smrzka, DanielDepartment für Geodynamik und Sedimentologie Universität Wien Wien Austria (författare)
  • Steindl, FlorianInstitut für Angewandte Geowissenschaften Technische Universität Graz Graz Austria (författare)
  • Böttcher, Michael E.Geochemie & Isotopen‐BiogeochemieLeibniz‐Institut für Ostseeforschung (IOW) Warnemünde Germany;Marine Geochemie Universität Greifswald Greifswald Germany;Interdisziplinäre Fakultät Department für Maritime Systeme Universität Rostock Rostock Germany (författare)
  • Libowitzky, EugenInstitut für Mineralogie und Kristallographie Universität Wien Wien Austria (författare)
  • Kiel, S.Naturhistoriska riksmuseet,Enheten för paleobiologi,Department of Palaeobiology Swedish Museum of Natural History Stockholm Sweden;Bolin Centre for Climate Research Stockholm University Stockholm Sweden(Swepub:nrm)stefkiel (författare)
  • Peckmann, JörnInstitut für Geologie Centrum für Erdsystemforschung und Nachhaltigkeit Universität Hamburg Hamburg Germany (författare)
  • Department für Geodynamik und Sedimentologie Universität Wien Wien AustriaInstitut für Angewandte Geowissenschaften Technische Universität Graz Graz Austria (creator_code:org_t)

Sammanhörande titlar

  • Ingår i:The Depositional Record: John Wiley & Sons7:2, s. 294-3102055-4877

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