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    Exceptional preservation of palaeozoic steroids in a diagenetic continuum

    193237_97262_srep02768.pdf (1.289Mb)
    Access Status
    Open access
    Authors
    Melendez, Ines
    Grice, Kliti
    Schwark, Lorenz
    Date
    2013
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Melendez, Ines and Grice, Kliti and Schwark, Lorenz. 2013. Exceptional preservation of palaeozoic steroids in a diagenetic continuum. Scientific Reports. 3 (2768): pp. 1-6.
    Source Title
    Scientific Reports
    DOI
    10.1038/srep02768
    ISSN
    2045-2322
    Remarks

    This article is published under the Open Access publishing model and distributed under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by-nc-nd/3.0. Please refer to the licence to obtain terms for any further reuse or distribution of this work.

    URI
    http://hdl.handle.net/20.500.11937/8544
    Collection
    • Curtin Research Publications
    Abstract

    The occurrence of intact sterols has been restricted to immature Cretaceous (~125 Ma) sediments with one report from the Late Jurassic (~165 Ma). Here we report the oldest occurrence of intact sterols in a Crustacean fossil preserved for ca. 380 Ma within a Devonian concretion. The exceptional preservation of the biomass is attributed to microbially induced carbonate encapsulation, preventing full decomposition and transformation thus extending sterol occurrences in the geosphere by 250 Ma. A suite of diagenetic transformation products of sterols was also identified in the concretion, demonstrating the remarkable coexistence of biomolecules and geomolecules in the same sample. Most importantly the original biolipids were found to be the most abundant steroids in the sample. We attribute the coexistence of steroids in a diagenetic continuum-ranging from stenols to triaromatic steroids-to microbially mediated eogenetic processes.

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