Illite dates from the World𩀙s oldest caves

R.A.L. Osborne; H. Zwingmann; R. Pogson; D.M. Colchester

doi:10.1071/ASEG2006ab128

ISSN: 2202-0586
E-ISSN:

oa Illite dates from the World𩀙s oldest caves
Authors R.A.L. Osborne^a, H. Zwingmann^b, R. Pogson^c and D.M. Colchester^d
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^a Education & Social WorkUniversity of Sydney, , NSW, 2006, [email protected] ^b CSIRO Petroleum & Centre of Excellence in Mass SpectrometryCurtin University, , WA, 6102, [email protected] ^c Australian Museum, Sydney, , NSW, 2010, [email protected] ^d Australian Museum, Sydney, , NSW, 2010
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2006, Issue ASEG2006 - 18th Geophysical Conference, Dec 2006, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2006ab128
- Published online: 01 Dec 2006

Abstract

K-Ar dating of illitic clays at Jenolan Caves has given the first direct evidence for the great antiquity of eastern Australian caves. It shows that sections of the caves formed in the Visean, before 340 Ma, making them the World’s oldest dated accessible caves by more than 240 Ma. Early Devonian (394 Ma) volcaniclastic palaeokarst was also identified. Permian and Triassic dates for some <0.4 μm fractions indicate growth of acicular illite during burial below the Sydney Basin. As well as raising problems about landform persistence, these dates set a new minimum age for folding in the eastern Lachlan Fold Belt. The most recent “Kanimblan” folding must have occurred prior to 340 Ma.

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2026-01-19

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References

Dalrymple G.B. & Lanphere M.A., 1969. Potassium-argon dating. W.H. Freeman. San Francisco.
Faure G., 1986. Principles of isotope geology, John Wiley and Sons, New York.
Gostin V.A. & Herbert C., 1973. Stratigraphy of the Upper Carboniferous and Lower Permian sequence, southern Sydney Basin: Journal of the Geological Society of Australia 20(1), 49-70.
Lundberg J., Ford D.C. & Hill C.A., 2001. A preliminary U-Pb date on cave spar, Big A Canyon, Guadalupe Mountains, New Mexico, U.S.A· Journal of Cave and Karst Studies 62(2), 144-8.
Osborne, R.A.L., 1984, Multiple karstification in the Lachlan Fold Belt in New South Wales: Reconnaissance Evidence: Journal and Proceedings of the Royal Society of New South Wales, 107, 15-34
Osborne R.A.L., 1999, The origin of Jenolan Caves: Elements of a new synthesis and framework chronology: Proceedings of the Linnean Society of New South Wales 121, 1-27.
Osborne, R.A.L., 2002, Paleokarst: Cessation and Rebirth? In F. Gabrovsek Ed., Evolution of karst: from prekarst to cessation: Zalozba ZRC, Ljubljana, p. 97-114.
Osborne, R.A.L., 2005, Dating ancient caves and related palaeokarst: Acta carsologica, 34(1), 51-72.
Osborne, R.A.L., Zwingmann, H., Pogson, R.E. & Colchester, D.M., 2006, Carboniferous cave deposits from Jenolan Caves, New South Wales, Australia. Australian Journal of Earth Sciences (IN PRESS, EXPECTED PUBLICATION DATE APRIL 2006)
Shaw S.E. & Flood R.H., 1993. Carboniferous magmatic activity in the Lachlan and New England Fold belts. In: Flood P.G. & Aitchison J.C. eds. New England Orogen Eastern Australia, pp 113-121. Department of Geology and Geophysics, University of New England, Annidale.

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Article Type: Research Article

Keyword(s): Illite; Jenolan; K-Ar dating; Kanimblan folding; Oldest Caves

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oa Illite dates from the World𩀙s oldest caves

Abstract

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