Palaeomagnetism and Magnetic Anisotropy of Proterozoic Banded-iron Formations and Iron Ores of the Hamersley Basin, Western Australia

D.A Clark; P.W Schmidt

doi:10.1071/EG993223

ISSN: 0812-3985
E-ISSN: 1834-7533

Palaeomagnetism and Magnetic Anisotropy of Proterozoic Banded-iron Formations and Iron Ores of the Hamersley Basin, Western Australia
Authors D.A Clark^a and P.W Schmidt^a
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^a CSIRO Division of Exploration and Mining, PO Box 136 North Ryde, , NSW, 2113
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 24, Issue 2, Jun 1993, p. 223 - 226
DOI: https://doi.org/10.1071/EG993223
- Published online: 01 Jun 1993

Abstract

The deflection of post-folding remanence towards the bedding plane by high magnetic anisotropy can produce an apparent synfolding signature, with best agreement between directions from different fold limbs after partial unfolding. The effect of magnetic anisotropy of banded-iron formations on measured remanence inclinations and inferred palaeolatitudes can lead to large errors in calculated palaeopoles for intermediate to moderately high palaeolatitudes but is minor for low palaeolatitudes. Anisotropy also causes cones of confidence to be underestimated, due to compression of the range of inclinations. Therefore high anisotropy can not only bias estimated palaeofield directions and cause underestimation of errors, but can also mislead interpretation of the relative timing of remanence acquisition.

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2026-01-14

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References

Embleton, (1978), ‘The palaeomagnetism of 2400 m.y. old rocks from the Australian Pilbara Craton and its relation to Archaean-Proterozoic tectonics’. Precamb. Res., 6, 275–291.
Evans, M.E., (1968), ‘Magnetization of dykes: A study of the palaeomagnetism of the Widgiemooltha Dike Suite, Western Australia’. J. Geophys. Res., 73, 3261–3270.
Giddings, J.W., (1976), ‘Precambrian palaeomagnetism in Australia I: Basic dykes and volcanics from the Yilgarn Block’. Tectonophysics, 30, 91–108.
Idnurm, M. and Giddings, J.W., (1988), ‘Australian Precambrian polar wander: A review’. Precamb. Res., 40/41, 61–88.
McElhinny, M.W. and Evans, M.E., (1976), ‘Palaeomagnetic results from the Hart Dolerite of the Kimberley Block, Australia’. Precamb. Res., 3, 231–241.
Morris, R.C., (1985), ‘Genesis of iron-ore in banded iron-formation by supergene and supergene-metamorphic processes — a conceptual model’, pp 73–235, in, Wolf, K.H. (Ed.), Handbook of Strata-Bound and Stratiform Ore Deposits 13. Elsevier, Amsterdam.
Porath, H. and Chamalaun, F.H. (1968). ‘Palaeomagnetism of Australian haematite ore bodies, II, Western Australia’. Geophys. J. R. Astr. Soc., 15, 253–264.
Schmidt, P.W. and Clark, D.A., (1993), ‘Palaeomagnetism and magnetic anisotropy of Proterozoic banded-iron formations and iron ores of the Hamersley Basin, Western Australia. Precamb. Res., in press.
Schmidt, P.W. and Embleton, B.J.J., (1985), ‘Pre-folding and overprint magnetic signatures in Precambrian (~2.9-2.7 Ga) igneous rocks from the Pilbara Craton and Hamersley Basin, N.W. Australia’. J. Geophys. Res., 90, 2967–2984.

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Article Type: Research Article

Keyword(s): Banded-iron formations; Hamersley Basin; iron ores; Magnetic anisotropy; Palaeomagnetism; Proterozoic

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Palaeomagnetism and Magnetic Anisotropy of Proterozoic Banded-iron Formations and Iron Ores of the Hamersley Basin, Western Australia

Abstract

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