Curtin University Homepage
  • Library
  • Help
    • Admin

    espace - Curtin’s institutional repository

    JavaScript is disabled for your browser. Some features of this site may not work without it.
    View Item 
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item

    Biomarker and isotopic trends in a Permian-Triassic sedimentary section at Kap Stosch, Greenland

    170581_StreamGate.pdf (3.799Mb)
    Access Status
    Open access
    Authors
    Hays, L.
    Grice, Kliti
    Foster, C.
    Summons, R.
    Date
    2012
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Hays, Lindsay E. and Grice, Kliti and Foster, Clinton B. and Summons, Roger E. 2012. Biomarker and isotopic trends in a Permian-Triassic sedimentary section at Kap Stosch, Greenland. Organic Geochemistry. 43 (Feb.): pp. 67-82.
    Source Title
    Organic Geochemistry
    DOI
    10.1016/j.orggeochem.2011.10.010
    ISSN
    01466380
    School
    Department of Applied Chemistry
    Remarks

    NOTICE: this is the author’s version of a work that was accepted for publication in Organic Geochemistry. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Organic Geochemistry . 43, (Feb), 2012. http://dx.doi.org/10.1016/j.orggeochem.2011.10.010

    URI
    http://hdl.handle.net/20.500.11937/26597
    Collection
    • Curtin Research Publications
    Abstract

    We report a geochemical study of a composite sedimentary section that captures the Permian-Triassic (PT) transition at Kap Stosch, East Greenland. The samples were from the original paleontological collection of early PT researchers. The rocks, which include samples from four proximal outcrop localities, were deposited during the Late Permian and Early Triassic at the margin of the Boreal Sea with a depositional hiatus and erosional event of unknown duration. Bulk geochemical measurements for most of the samples show good correlation between S2 and TOC% which, combined with low Tmax values, indicate that the organic matter (OM) that formed contemporaneously with sediment deposition is of relatively low maturity. Significant changes through the PT transition include a pronounced switch in the δ13C of TOC from high values near -24% to lower values averaging 32%, that is matched by a significant increase in the hydrogen index (HI) of the kerogen. The Permian samples containing 13C enriched OM also have low Rock-Eval HI values and anomalous pyrograms, indicating that the kerogen is heterogeneous in terms of source and maturity, as confirmed by microscopic analysis of the kerogen concentrates.Samples from the Permian section contain an abundance of black angular fragments of woody tissue in addition to gymnosperm pollen and spinose acritarchs of the Vittatina-Association (Balme, B., 1979. Palynology of Permian-Triassic boundary beds at Kap Stosch. Meddeleleser om Gronland 200, 1-36). In contrast, black woody tissue is rare in samples from the Early Triassic section with well preserved gymnosperm and lycopod pollen and spores of the Protohaploxypinus and Taeniaesporites associations. Biomarkers indicate moderate maturity for Permian samples, with the C27 sterane 20S/(20S + 20R), C31 homohopane 22S/(22S + 22R) ratio and Ts/(Ts + Tm) values all being higher than those for Triassic sediments. The marked switch in maturity indicators across the PT transition suggests an unconformity consistent with palynological observations. The pristane/phytane values are low and the homohopane index values high, indicating that anoxic conditions prevailed throughout deposition of the sediments.Additionally, markers of photic zone euxinia (i.e. isorenieratane, crocetane and 2,3,6-aryl isoprenoids) were present in all samples and all show maximum abundance closest to the PT transition. The C33 n-alkyl cyclohexane, a potential event marker for the onset of the biotic crisis in the Late Permian, was found in samples at, and immediately following, the paleontological PT transition. Despite the distinct change in lithology across the PT transition, the redox and Chlorobi-derived biomarkers indicate that photic zone euxinic conditions prevailed throughout the deposition of the Kap Stosch sedimentary sequence.

    Related items

    Showing items related by title, author, creator and subject.

    • Biomarker distributions and stable isotopes (C, S, H) to establish palaeoenvironmental change related to the end-Permian mass extinction event
      Nabbefeld, Birgit (2009)
      Extinction, the irreversible loss of species, is perhaps the most alarming symptom of the ongoing biodiversity crisis. Some of the most significant changes in evolution throughout Earth’s history have coincided with ...
    • A multistratigraphic approach to pinpoint the Permian-Triassic boundary in continental depositsThe Zechstein–Lower Buntsandstein transition in Germany
      Scholze, F.; Wang, X.; Kirscher, Uwe; Kraft, J.; Schneider, J.; Götz, A.; Joachimski, M.; Bachtadse, V. (2017)
      © 2017 Elsevier B.V.The Central European Basin is very suitable for high-resolution multistratigraphy of Late Permian to Early Triassic continental deposits. Here the well exposed continuous transition of the lithostratigraphic ...
    • Thermal History and Deep Overpressure Modelling in the Northern Carnarvon Basin, North West Shelf, Australia
      He, Sheng (2002)
      The Northern Carnarvon Basin is the richest petroleum province in Australia. About 50 gas/condensate and oil fields, associated mainly with Jurassic source rocks, have been discovered in the sub-basins and on the Rankin ...
    Advanced search

    Browse

    Communities & CollectionsIssue DateAuthorTitleSubjectDocument TypeThis CollectionIssue DateAuthorTitleSubjectDocument Type

    My Account

    Admin

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    Follow Curtin

    • 
    • 
    • 
    • 
    • 

    CRICOS Provider Code: 00301JABN: 99 143 842 569TEQSA: PRV12158

    Copyright | Disclaimer | Privacy statement | Accessibility

    Curtin would like to pay respect to the Aboriginal and Torres Strait Islander members of our community by acknowledging the traditional owners of the land on which the Perth campus is located, the Whadjuk people of the Nyungar Nation; and on our Kalgoorlie campus, the Wongutha people of the North-Eastern Goldfields.