CA-IDTIMS and biostratigraphy: Their impact on exploration

John Laurie; Tegan Smith; Simon Bodorkos; Bob Nicoll; Jim Crowley; Dan Mantle; Geoff Wood

doi:10.1071/ASEG2018abW10_1B

1st Australasian Exploration Geoscience Conference – Exploration Innovation Integration

ISSN: 2202-0586
E-ISSN:

oa CA-IDTIMS and biostratigraphy: Their impact on exploration
Authors John Laurie^a, Tegan Smith^b, Simon Bodorkos^c, Bob Nicoll^d, Jim Crowley^e, Dan Mantle^f and Geoff Wood^g
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^a Geoscience Australia, Canberra, , ACT, [email protected] ^b Geoscience Australia, Canberra, , ACT, [email protected] ^c Geoscience Australia, Canberra, , ACT, [email protected] ^d Geoscience Australia, Canberra, , ACT, [email protected] ^e Boise State University, Boise, , Idaho, , USA ^f MGPalaeo Perth, , WA ^g Santos Ltd, Adelaide, , SA
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2018, Issue 1st Australasian Exploration Geoscience Conference – Exploration Innovation Integration, Dec 2018, p. 1 - 5
DOI: https://doi.org/10.1071/ASEG2018abW10_1B
- Published online: 01 Dec 2018

Abstract

Uranium-Lead dating of Zircon using the Chemical Abrasion-Isotope Dilution Thermal Ionisation Mass Spectrometry (CA-IDTIMS) technique has largely overcome the problem of radiogenic lead loss, and has greatly improved the precision of the dating. That improvement in precision and the plethora of tuffs throughout the Permian and Triassic successions in eastern Australian basins (Tasmania, Sydney, Gunnedah, Bowen and Galilee) permits the recalibration of the Australian spore and pollen palynostratigraphic scheme directly to the numerical timescale, obviating the need for a multi-step process of correlation. The Permian recalibration has, for example, shown the base of the Dulhuntyispora parvithola (APP5) Zone to be about 6 million years younger than previously calibrated, and in the Triassic, the base of the Polycingulatisporites crenulatus (APT5) Zone could be about as much as 10 million years younger than previously calibrated.

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References

Bodorkos, S., Crowley, J., Holmes, E., Laurie, J., Mantle, D., McKellar, J., Mory, A., Nicoll, R., Phillips, L., Smith, T., Stephenson, M. and Wood, G., 2016, New dates for Permian palynostratigraphic biozones in the Sydney, Gunnedah, Bowen, Galilee and Canning basins, Australia: Permophiles 63, 19-21.
Bomfleur, B., Schoner, R., Schneider, J.W., Viereck, L., Kerp, H. and McKellar, J.L., 2014, From the Transantarctic Basin to the Ferrar Large Igneous Province - New palynostratigraphic age constraints for Triassic-Jurassic sedimentation and magmatism in East Antarctica: Review of Palaeobotany and Palynology 207, 18-37.
de Jersey, N.J. & Hamilton, M., 1965, Palynology of samples from the Kingaroy area: Queensland Government Mining Journal 66, 74-76.
Laurie, J.R., Bodorkos, S, Nicoll, R.S., Crowley, J.L., Mantle, D.J., Mory, A.J., Wood, G.R., Champion, D.C., Holmes, E. and Smith, T.E., 2016, Calibration of the middle and late Permian palynostratigraphy of Australia to the geologic time scale via U-Pb zircon CA-IDTIMS dating: Australian Journal of Earth Sciences, 63, 701-730.
Mantle, D.J., Kelman, A.P., Nicoll, R.S. and Laurie, J.R., 2010, Australian Biozonation Chart: Geoscience Australia, Canberra.
Mattinson, J.M., 2005, Zircon U-Pb chemical abrasion (“CA-TIMS”) method: Combined annealing and multi-step partial dissolution analysis for improved precision and accuracy of zircon ages: Chemical Geology, 220, 47-66.
Metcalfe, I., Crowley, J.L., Nicoll, R.S. and Schmitz, M., 2015, High-precision U-Pb CA-TIMS calibration of Middle Permian to lower Triassic sequences, mass extinction and extreme climate-change in eastern Australian Gondwana. Gondwana Research 28 6181.
Smith, T.E., Ogg, J., Kelman, A., Abbott, S. and Bernecker, T., 2015, Toward common stratigraphic frameworks for Australia’s offshore hydrocarbon provinces: APPEA Conference and Exhibition, 17-20 May 2015, Melbourne. Extended Abstract.

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Article Type: Research Article

Keyword(s): CA-IDTIMS; geochronology; palynostratigraphy; Permian; Triassic

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