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Sökning: onr:"swepub:oai:lup.lub.lu.se:38b935a2-9cf5-401b-9d74-aca3f2029203" > The formation of mi...

  • Heindel, KatrinUniversity of Vienna (författare)

The formation of microbial-metazoan bioherms and biostromes following the latest Permian mass extinction

  • Artikel/kapitelEngelska2018

Förlag, utgivningsår, omfång ...

  • Elsevier BV,2018
  • 16 s.

Nummerbeteckningar

  • LIBRIS-ID:oai:lup.lub.lu.se:38b935a2-9cf5-401b-9d74-aca3f2029203
  • https://lup.lub.lu.se/record/38b935a2-9cf5-401b-9d74-aca3f2029203URI
  • https://doi.org/10.1016/j.gr.2018.05.007DOI

Kompletterande språkuppgifter

  • Språk:engelska
  • Sammanfattning på:engelska

Ingår i deldatabas

Klassifikation

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

Anmärkningar

  • After the latest Permian mass extinction event, microbial mats filled the ecological niche previously occupied by metazoan reefs, resulting in widespread microbialites. This study focuses on the lipid biomarker (molecular fossil) and invertebrate fossil records from Neotethyan platform margin sections to understand microbial-metazoan bioherm formation. Here, we find that early Griesbachian thrombolitic and stromatolitic microbialites from Çürük Dag (Turkey) and Kuh e Surmeh (Iran) contain abundant lipid biomarkers, representing input from cyanobacteria, anoxygenic phototrophic bacteria, sulfate-reducing bacteria, and halophilic archaea. The biomarker inventory suggests that the microbialites were constructed by cyanobacteria-dominated microbial mats. Biomarkers of halophilic archaea are interpreted to reflect input from the water column, suggesting that the Neotethys experienced at least episodically hypersaline conditions. We also demonstrate that bacteria, possible keratose sponges (up to 50% of the carbonate is represented by the possible sponges), and microconchids lived synergistically to form microbial-metazoan bioherms in the immediate aftermath of the extinction along the western margin of the Neotethys. Abundant fossils of oxygen-dependent invertebrates (i.e. microconchids, bivalves, gastropods, brachiopods, and ostracods) and foraminifers were also found within these bioherms. The presence of invertebrates in conjunction with abundant molecular fossils of cyanobacteria indicates an oxygenated water column. Even though the presence of the biomarker isorenieratane in microbialites may considered as evidence for euxinic conditions in the water column, its absence in the background sediments rather points to a source organism belonging to the mat community. The new finding of bioherms built in part by metazoans suggests that reef ecosystems underwent a major turnover across the extinction event, and shortens the ‘metazoan reef gap’ to just the uppermost Changhsingian. During the Early Triassic, therefore, reefal ecosystems were able to recover in oxygenated settings since the earliest Griesbachian, albeit in an impoverished state.

Ämnesord och genrebeteckningar

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

  • Foster, William J.University of Texas at Austin (författare)
  • Richoz, SylvainLund University,Lunds universitet,Berggrundsgeologi,Geologiska institutionen,Naturvetenskapliga fakulteten,Lithosphere and Biosphere Science,Department of Geology,Faculty of Science,Karl-Franzens-University of Graz(Swepub:lu)sy2872ri (författare)
  • Birgel, DanielUniversity of Hamburg (författare)
  • Roden, Vanessa JulieFriedrich-Alexander University Erlangen-Nürnberg (författare)
  • Baud, AymonNo affiliation available (private) (författare)
  • Brandner, RainerUniversity of Innsbruck (författare)
  • Krystyn, LeopoldUniversity of Vienna (författare)
  • Mohtat, TayebehGeological Survey and Mineral Exploration of Iran (författare)
  • Koşun, ErdalAkdeniz University (författare)
  • Twitchett, Richard J.Natural History Museum, London (författare)
  • Reitner, JoachimUniversity of Göttingen (författare)
  • Peckmann, JörnUniversity of Hamburg (författare)
  • University of ViennaUniversity of Texas at Austin (creator_code:org_t)

Sammanhörande titlar

  • Ingår i:Gondwana Research: Elsevier BV61, s. 187-2021342-937X

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