Higher-plant evolution during the Cretaceous to Palaeogene in the Gippsland Basin, Australia

L. Jiang, S. C. George

    Research output: Contribution to conferenceAbstract

    Abstract

    Diverse higher plant-derived biomarkers have been detected in the Upper Cretaceous−Palaeogene Latrobe Group hydrocarbon source rocks in the Gippsland Basin. Interpretation of aliphatic and aromatic sesqui-, di- and triterpenoids indicates that gymnosperms (e.g. Araucariaceae and Podocarpaceae) contributed more organic matter than angiosperms (e.g. Nothofagus, Ilex and Proteaceae) to the Upper Cretaceous palaeofloras in the Gippsland Basin. However, angiosperms gradually began to dominate the Palaeogene rainforests, especially with Nothofagus, Proteaceae and Euphorbiaceae. Analyses of the oleanane index and various AGIs, combined with previous studies, enables the inference that the palaeoclimate changed from warming to relative cooling and then back to warming again, over the time period from the T. lilliei biozone to the P. asperopolus biozone. This is consistent with palynological evidence and estimates of sea-surface temperature changes recorded in the Gippsland Basin (Wagstaff et al., 2006; Macphail, 2007).
    Original languageEnglish
    Number of pages2
    DOIs
    Publication statusPublished - Sep 2019
    EventInternational Meeting on Organic Geochemistry (29th : 2019) - Gothenburg, Sweden
    Duration: 1 Sep 20196 Sep 2019
    https://www.imog.eaog.org/ (IMOG 2019)

    Conference

    ConferenceInternational Meeting on Organic Geochemistry (29th : 2019)
    Abbreviated titleIMOG 2019
    CountrySweden
    CityGothenburg
    Period1/09/196/09/19
    Internet address

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    Jiang, L., & George, S. C. (2019). Higher-plant evolution during the Cretaceous to Palaeogene in the Gippsland Basin, Australia. Abstract from International Meeting on Organic Geochemistry (29th : 2019), Gothenburg, Sweden. https://doi.org/10.3997/2214-4609.201902799