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    Correlating terrestrial signatures from biomarker distributions, δ13C, and palynology in fluvio-deltaic deposits from NW Australia (Triassic-Jurassic)

    Access Status
    Fulltext not available
    Authors
    Grice, Kliti
    Backhouse, J.
    Alexander, Robert
    Marshall, N.
    Logan, G.
    Date
    2005
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Grice, Kliti and Backhouse, John and Alexander, Robert and Marshall, Neil and Logan, Graham. 2005. Correlating terrestrial signatures from biomarker distributions, δ13C, and palynology in fluvio-deltaic deposits from NW Australia (Triassic-Jurassic). Organic Geochemistry. 36 (10): pp. 1347-1358.
    Source Title
    Organic Geochemistry
    DOI
    10.1016/j.orggeochem.2005.06.003
    ISSN
    01466380
    Faculty
    Department of Applied Chemistry
    School of Science
    Faculty of Science and Engineering
    Remarks

    The link to the journal’s home page is: http://www.elsevier.com/wps/find/journaldescription.cws_home/476/description#description

    Copyright © 2005 Elsevier Ltd. All rights reserved

    URI
    http://hdl.handle.net/20.500.11937/35125
    Collection
    • Curtin Research Publications
    Abstract

    A multidisciplinary study using molecular and organic isotope geochemistry, petrology and palynology has been used to establish palaeoenvironmental conditions of fluvio-deltaic deposits from the Delambre-1 well, Western Australia (Triassic–Jurassic). Changes in higher plant biomarker distributions correlate with (1) brackish water environments; (2) major changes in composition of spore and pollen assemblages; (3) variations in types of sedimentary facies; and (4) stable carbon isotopic composition of higher plant biomarkers. These changes are all consistent with the occurrence of climatic shifts in northwestern Australia during Triassic–Jurassic periods established by [Parrish, J.T., Bradshaw, M.T., Brakel, A.T., Mulholland, S.M., Totterdell, J.M., Yeates, A.N., 1996. Palaeoclimatology of Australia during the Pangean interval. Palaeoclimates 1, 241–281].The combustion marker benzo[e]pyrene is abundant in samples that contain pollen from Falcisporites australis. The decline of F. australis and the rapid emergence of assemblages dominated by Corollina spp. at the end of the Triassic marks a rapid-pollen spore extinction event. At the Triassic–Jurassic boundary there is an increase in relative abundance of the higher plant biomarkers (cadalene and simonellite) in a prodeltaic facies. The δ13C values of between −26.9‰ and −24.9‰ for retene are consistent with a source from class I conifer resinites and relate to samples abundant in Araucariacian conifers in the Early–Middle Jurassic where facies are characterized as pro-distal deltaic.

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