Calibrating the middle and late Permian palynostratigraphy of Australia to the geologic time-scale via U–Pb zircon CA-IDTIMS dating
| Autor: | James L. Crowley, Robert S. Nicoll, David C. Champion, John R. Laurie, Arthur J. Mory, G.R. Wood, Tegan Smith, E.K. Holmes, S. Bodorkos, John Backhouse, Daniel Mantle |
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| Rok vydání: | 2016 |
| Předmět: |
geography
geography.geographical_feature_category Canning basin 010504 meteorology & atmospheric sciences Permian Structural basin 010502 geochemistry & geophysics 01 natural sciences Paleontology Geologic time scale Volcano Earth and Planetary Sciences (miscellaneous) General Earth and Planetary Sciences Geology 0105 earth and related environmental sciences Zircon |
| Zdroj: | Australian Journal of Earth Sciences. 63:701-730 |
| ISSN: | 1440-0952 0812-0099 |
| DOI: | 10.1080/08120099.2016.1233456 |
| Popis: | The advent of chemical abrasion-isotope dilution thermal ionisation mass spectrometry (CA-IDTIMS) has revolutionised U–Pb dating of zircon, and the enhanced precision of eruption ages determined on volcanic layers within basin successions permits an improved calibration of biostratigraphic schemes to the numerical time-scale. The Guadalupian and Lopingian (Permian) successions in the Sydney, Gunnedah, Bowen and Canning basins are mostly non-marine and include numerous airfall tuff units, many of which contain zircon. The eastern Australian palynostratigraphic scheme provides the basis for much of the local correlation, but the present calibration of this scheme against the numerical time-scale depends on a correlation to Western Australia, using rare ammonoids and conodonts in that succession to link to the standard global marine biostratigraphic scheme. High-precision U–Pb zircon dating of tuff layers via CA-IDTIMS allows this tenuous correlation to be circumvented—the resulting direct calibratio... |
| Databáze: | OpenAIRE |
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