1887
Volume 10, Issue 1
  • ISSN: 0812-3985
  • E-ISSN: 1834-7533

Abstract

Regional aeromagnetic surveys in the Pine Creek Geosyncline, show that much of the region has a fairly flat magnetic field, and few deep seated magnetic anomalies are evident. The most prominent features are zones of narrow curvilinear anomalies which occur over Lower Proterozoic metasediments.

The geological and physical characteristics of the sources of some of the magnetic anomalies over the Lower Proterozoic metasediments have been investigated by: detailed interpretation of magnetic anomalies, geological mapping, ground magnetic surveys, laboratory physical property measurements, and mineralogical studies of rock samples and drill core.

In the central part of the Pine Creek Geosyncline most of the prominent curvilinear anomalies result from strongly remanently magnetised iron sulphides in the Golden Dyke Formation sediments. In the east, in the Alligator Rivers Uranium Field, the prominent anomalies result from inductively magnetised magnetite in Cahill Formation schists. In the west, in the Litchfield Block, prominent anomalies result from inductively magnetised iron oxides in unnamed schists. The regional distribution of magnetic iron facies in the Lower Proterozoic metasediments might be a useful tool to assist in formulating hypotheses regarding the geological history of the Pine Creek Geosyncline.

© 1979 ASEG
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1979-03-01
2026-01-23

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References

  1. BRYAN, R., (1962) Lower Proterozoic basic intrusive rocks of the Katherine-Darwin area, Northern Territory. Bureau of Mineral Resources, Australia, Record1962/7 (unpublished)
  2. CRICK, I.H., STUART-SMITH, P.G. and NEEDHAM, R.S., (1978a) Stratigraphic significance of a discovery of Lower Proterozoic tuff in the Pine Creek Geosyncline. BMR Journal of Australian Geology & Geophysics, 3, 163-5
  3. CRICK, I.H., STUART-SMITH, P.G., and NEEDHAM, R.S. (1978 b) Advances in the understanding of the stratigraphy of the Pine Creek Geosyncline, Northern Territory. In Seventh BMR Symposium (Abstracts). BMR Journal of Australian Geology & Geophysics, 3, 259
  4. FERGUSON, J., and NEEDHAM, R.S. (1978) The Zamu Dolerite: a Lower Proterozoic continental tholeiitic-suite from the Northern Territory, Australia. Geological Society of Australia, 25, 309-22
  5. FRENCH, B.M. (1973) Mineral assemblages in diagenetic and low-grade metamorphic iron formation. Economic Geology, 68, 1063-74
  6. GAY, S.P. Jnr. (1963) Standard curves for the interpretation of magnetic anomalies over long tabular bodies. Geophysics, 28, 161-200
  7. horsfall, K.R., and WlLKES, P.G., (1975) Aeromagnetic and radiometric survey of Cobourg Peninsula, Alligator River and Mount Evelyn (part) 1:250 000 Sheet areas Northern Territory 1971-1972. Bureau of Mineral Resources, Australia, Record, 1975/89 (unpublished).
  8. Irving, E., (1964) Palaeomagnetism and its application to geological and geophysical problems. John Wiley & Sons, Inc., Sydney
  9. NAGATA, T., (1961) Rock Magnetism. Maruzen Company Ltd., Tokyo
  10. NEEDHAM, R.S., and STUART-SMITH, P.G., (1976) The Cahill Formation – host to uranium deposits in the Alligator Rivers Uranium Field, Australia. BMR Journal of Australian Geology & Geophysics 1, 321-33
  11. PRICE, D.G. (1974) 1973 Exploration for base metals and uranium, CR1541, EL 71 Finnis River, NT, EL 897 Mt Tolmer NT. The Broken Hill Proprietary Company Limited Australia (Unpublished)
  12. PRITCHARD, C.E. (1964) Progress report on diamond drilling, Rum Jungle area 1964. Bureau of Mineral Resources, Australia, Record 1964/7
  13. SCHWARZ, E.J. (1973) Magnetic characteristics of massive sulphide ore bodies near Sudbury, Canada, Canadian Journal of Earth Sciences, 10, 1735-43
  14. SCHWARZ, E.J. (1975) Magnetic properties of pyrrhotite and their use in applied geology and geophysics. Geological Survey of Canada, Paper 74-59
  15. SMART, P.G., WILKES, P.G., NEEDHAM, R.S. and WATCHMAN, A.L. (1976) Geology and geophysics of the Alligator Rivers Region; In Economic Geology of Australian and Papua New Guinea, Volume 1 – Metals. Australasian Institute of Mining and Metallurgy, Melbourne, Monograph 5, 285-301
  16. STEPHANSSON, O., and JOHNSON, K. (1976) Granite diapirism in the Rum Jungle area. Northern Australia. Precambrian Research, 3, 159-85
  17. STUART-SMITH, P.G. and FERGUSON, John, (1978) The Oenpelli Dolerite – a Precambrian continental tholeiitic suite from the Northern Territory, Australia, BMR Journal of Australian Geology & Geophysics, 3, 125-33
  18. THOMPSON, J.B. (1972) Oxides and sulphides in regional metamorph-ism of pelitic schists. 24th International Geological Congress, 1972, Abstracts, Section 10, 27-35
  19. WALPOLE, B.P., CROHN, P.W., DUNN, P.R., and RANDAL, M.A. (1968) Geology of the Katherine-Darwin region, Northern Territory. Bureau of Mineral Resources, Australia, Bulletin, 82
  20. WINKLER, H.J.F., (1976) Petrogenesis of Metamorphic Rocks. Springer-Verlag New York, 334
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