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Title: New U-Pb CA-IDTIMS isotopic age tie points for the Lightjack Formation, Canning Basin, Western Australia
Contributor(s): Nicoll, RS (author); Metcalfe, Ian  (author); Mory, AJ (author); Mantle, D (author); Crowley, J (author); Mundil, R (author); Denyszyn, S (author); Foster, CB (author)
Publication Date: 2011
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Abstract: Ash-fall tuffs are extremely rare in the Permian of Western Australia, but recent coal exploration boreholes in the Fitzroy Trough of the Canning Basin have intersected several in the ~30-300 m thick Lightjack Formation. We here report four high-precision U-Pb zircon CA-IDTIMS ages of these tuffs. The formation contains marine to non-marine facies, and extends along the major depocentre of the Canning Basin (Fitzroy Trough - Gregory Sub-basin) and its margins, where it is sporadically exposed at localities including Lightjack Hill (type section), the Noonkanbah area, Liveringa Ridge and in Shore Range. The formation is dominated by siltstone and calcareous to ferruginous sandstone, with minor coal and fossiliferous beds near its base. It has previously been assigned a Roadian-Wordian age based on ammonoids ('Daubichites goochi' and 'Bamyaniceras australe') and brachiopods ('Neochonites (Sommeriella) afanasyevae' Zone), whereas palynomorphs ('Dulhuntyispora granulata' to 'D. parvithola' Zones) indicate a slightly younger age for the upper part of the formation.
Publication Type: Conference Publication
Conference Name: ICCP 2011: XVII International Congress on the Carboniferous and Permian, Perth, Australia, 3rd - 8th July, 2011
Conference Details: ICCP 2011: XVII International Congress on the Carboniferous and Permian, Perth, Australia, 3rd - 8th July, 2011
Source of Publication: Programme & Abstracts: The XVII International Congress on the Carboniferous and Permian, p. 96-96
Publisher: Geological Survey of Western Australia
Place of Publication: Perth, Australia
Field of Research (FOR): 040303 Geochronology
040203 Isotope Geochemistry
HERDC Category Description: E3 Extract of Scholarly Conference Publication
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Series Name: Geological Survey of Western Australia Record
Series Number : 2011/20
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