New SHRIMP U-Pb zircon geochronology for the central Pine Creek Orogen, Northern Territory: implications for Top End orogenesis

K.E. Worden; C.J. Carson; I.R. Scrimgeour; J.H. Lally; N.J. Doyle

doi:10.1071/ASEG2006ab199

ISSN: 2202-0586
E-ISSN:

oa New SHRIMP U-Pb zircon geochronology for the central Pine Creek Orogen, Northern Territory: implications for Top End orogenesis
Authors K.E. Worden^a, C.J. Carson^b, I.R. Scrimgeour^c, J.H. Lally^d and N.J. Doyle^e
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^a Geoscmnce Australia, GPO Box 378 Canberra, ACT 2601, [email protected] ^b Geoscmnce Australia, GPO Box 378 Canberra, ACT 2601, [email protected] ^c Northern Territory Geological Survey, GPO Box 3000 Darwin, NT, 0801, [email protected] ^d BHPBilliton Iron Ore Pty Ltd, 225 St Georges Terrace Perth, WA, 6000, [email protected] ^e Cameco Australia Pty Ltd, 66 Winnellie Rd Winnellie, NT, 0820, Nigel [email protected]
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/ASEG2006ab199
- Published online: 01 Dec 2006

Abstract

The Palaeoproterozoic Pine Creek Orogen, northern Australia, forms part of the North Australia Craton, and is a highly prospective terrain, with abundant mineral occurrences including gold and uranium. Geologically, it comprises sedimentary sequences deposited on rifted Archaean basement that were deformed, metamorphosed, and intruded by granitoids and mafic bodies during the ca. 1880-1850 Ma Nimbuwah Event, one of the constituent events of the Barramundi Orogeny.

The stratigraphy of the central Pine Creek Orogen is well-characterised due to its extensive exposure, preservation, and low grade greenschist facies metamorphism. It contains units suitable for isotopie dating, permitting determination of absolute ages within a well-controlled stratigraphic framework. We present new zircon U-Pb SHRIMP results for volcanics and volcanogenic strata from various intervals within the pre-orogenic stratigraphy. These data: (a) indicate the presence of volcanic activity in the Pine Creek Orogen at ca. 2025 Ma; (b) provide revised constraints on the tectono-thermal evolution of the Pine Creek Orogen, specifically a revision of the Nimbuwah Event by some 20 Ma; (c) suggest that volcanism was widespread across the Pine Creek Orogen at ca. 1860 Ma; and (d) permit assessment of relative deposition rates of and time intervals between deposition of the Palaeoproterozoic stratigraphic sequences.

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2006-12-01

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References

Ahmad, M., 1998, Geology and mineral deposits of the Pine Creek Inlier and McArthur Basin, Northern Territory, AGSO Journal of Geology and Geophysics, 17(3) 1-17.
Etheridge, M.A., Rutland, R.W.R., and Wyborn, L.A.I., 1987, Orogenesis and tectonic process in the early to middle Proterozoic of northern Australia, Geodynamic Series 17 American Geophysical Union, Washington D.C., 131-147.
Needham, R.S., Stuart-Smith, P.G., and Page, R.W., 1988, Tectonic evolution of the Pine Creek Inlier, Northern Territory, Precambrian Research, 40/41 543 -564.
Needham, R.S., Crick, I.H., and Stuart-Smith, P.G., 1980, Regional geology of the Pine Creek Geosyncline. Proceedings of International Uranium Symposium on the Pine Creek Geosyncline, International Atomic Energy Agency, Vienna, 1980. 1-22.
Page, R.W., 1988, Geochronology of early to middle Proterozoic fold belts in northern Australia: a review. Precambrian Research, 40/41 1-19.
Page, R.W, and Williams, I.S., 1988, Age of the Barramundi Orogeny in northern Australia by means of ion microprobe and conventional U-Pb studies, Precambrian Research, 40/41 21-36.
Plumb, K.A., 1979, Structure and tectonic style of the Precambrian shields and platforms of northern Australia, Tectonophysics, 58 291 – 325.
Walpole, B.P., Crohn, P.W., Dunn, P.R, and Randal, M.A., 1968. Geology of the Katherine-Darwin region, Northern Territory. Bulletin Bureau Mineral Resources, Geology, and Geophysics Australia 82.

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Article Type: Research Article

Keyword(s): geochronology; Pine Creek Orogen; SHRIMP

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oa New SHRIMP U-Pb zircon geochronology for the central Pine Creek Orogen, Northern Territory: implications for Top End orogenesis

Abstract

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