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    Late Devonian carbonate magnetostratigraphy from the Oscar and Horse Spring Ranges, Lennard Shelf, Canning Basin, Western Australia

    Access Status
    Fulltext not available
    Authors
    Hansma, J.
    Tohver, E.
    Yan, M.
    Trinajstic, Katherine
    Roelofs, Brett
    Peek, S.
    Slotznick, S.
    Kirschvink, J.
    Playton, T.
    Haines, P.
    Hocking, R.
    Date
    2015
    Type
    Journal Article
    
    Metadata
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    Citation
    Hansma, J. and Tohver, E. and Yan, M. and Trinajstic, K. and Roelofs, B. and Peek, S. and Slotznick, S. et al. 2015. Late Devonian carbonate magnetostratigraphy from the Oscar and Horse Spring Ranges, Lennard Shelf, Canning Basin, Western Australia. Earth and Planetary Science Letters. 409: pp. 232-242.
    Source Title
    Earth and Planetary Science Letters
    DOI
    10.1016/j.epsl.2014.10.054
    ISSN
    0012-821X
    School
    Department of Chemistry
    URI
    http://hdl.handle.net/20.500.11937/35043
    Collection
    • Curtin Research Publications
    Abstract

    The Late Devonian was a time of major evolutionary change encompassing the fifth largest mass extinction, the Frasnian–Famennian event. In order to establish a chronological framework for global correlation before, during, and following the Frasnian–Famennian mass extinction, we carried out a coupled magnetostratigraphic and biostratigraphic study of two stratigraphic sections in the Upper Devonian carbonate reef complexes of the Lennard Shelf, in the Canning Basin, Western Australia. Magnetostratigraphy from these rocks provides the first high-resolution definition of the Late Devonian magnetic polarity timescale. A 581-m-reference section and an 82-m overlapping section through the marginal slope facies (Napier Formation) of the Oscar Range as well as a 117-m section at Horse Spring (Virgin Hills Formation) were sampled at decimeter to meter scale for magnetostratigraphy. Conodont biostratigraphy was used to correlate both sections, and link magnetostratigraphic polarity zones to a globally established biostratigraphy. A stable, Characteristic Remanent Magnetization (ChRM) with dual polarities (NE, shallowly upward and SW, shallowly downward) is recovered from ∼60%∼60% of all samples, with magnetite inferred to be the chief magnetic carrier from thermal demagnetization characteristics. These directions define a geomagnetic pole at 49.5°S/285.8°E and α95=2.4α95=2.4 (n=501n=501), placing the Canning Basin at 9.9°S during the Late Devonian, consistent with carbonate reef development at this time.A conservative interpretation of the magnetostratigraphy shows the recovery of multiple reversals from both sections, not including possible cryptochrons and short duration magnetozones. Field tests for primary remanence include positive reversal tests and matching magnetozones from an overlapping section in the Oscar Range. A strong correlation was found between magnetic polarity stratigraphies of the Oscar Range and Horse Spring sections, and we correlate 12 magnetostratigraphic packages. The relative stratigraphic thicknesses of the isochronous sediments from these two sections indicate that carbonate accumulation was ∼4.5× faster in the middle slope deposits at Oscar Range than in the more distal, lower slope Horse Spring deposits for the middle Frasnian through Famennian. The magnetic field during the Late Devonian underwent a relatively high reversal frequency with good potential for regional and global correlation, and should prove useful in deciphering a high-resolution chronostratigraphy across the Lennard Shelf to enable higher confidence examination of reef development across a major biotic crisis.

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    • Development of a Regional Stratigraphic Framework For Upper Devonian Reef Complexes Using Integrated Chronostratigraphy: Lennard Shelf, Canning Basin, Western Australia
      Playton, T.; Hocking, R.; Montgomery, P.; Tohver, E.; Hillbun, K.; Katz, D.; Haines, P.; Trinajstic, Katherine; Yan, M.; Hansma, J.; Pisarevsky, S.; Kirschvink, J.; Cawood, P.; Grice, Kliti; Tulipani, Svenja; Ratcliffe, K.; Wray, D.; Caulfield-Kerney, S.; Ward, P.; Playford, P. (2013)
      Questions regarding heterogeneity and architecture of reefal carbonate platform systems may be resolved by well-constrained chronostratigraphic frameworks, developed from the integration of multiple independent signals ...
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