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Book Chapter

New Palaeoproterozoic palaeomagnetic data from the Kaapvaal Craton, South Africa

By
Shawn Letts
Shawn Letts
School of Geosciences, University of Witwatersrand, WITS 2050, South AfricaAnglo American, P.O. Box 61587, Marshalltown, Johannesburg 2107, South Africa
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Trond H. Torsvik
Trond H. Torsvik
School of Geosciences, University of Witwatersrand, WITS 2050, South AfricaPhysics of Geological Processes, University of Oslo, NorwayCentre for Geodynamics, Geological Survey of Norway, N-7491 Trondheim, NorwayCentre for Advanced Study, Drammensveien 78, NO-0271 Oslo, Norway
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Susan J. Webb
Susan J. Webb
School of Geosciences, University of Witwatersrand, WITS 2050, South Africa
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Lewis D. Ashwal
Lewis D. Ashwal
School of Geosciences, University of Witwatersrand, WITS 2050, South Africa
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Published:
January 01, 2011

Abstract

Palaeomagnetic data from the well-dated 2060.6±0.5 Ma Phalaborwa Complex in South Africa (Kaapvaal Craton) are of excellent quality. High unblocking components are carried by magnetite and single polarity remanence directions (mean declination 5.0°, inclination 57.3°, α95 = 5.2°) yield a palaeomagnetic pole (latitude 27.7°N, longitude 35.8°E, A95 = 6.6°) that overlaps with existing poles from the near coeval 2054.4±1.3 Ma Bushveld Complex. The Phalaborwa and Bushveld complex poles, along with poles from the well-dated Vredefort impact (2023±4 Ma) and Post-Waterberg Dolerites (1874.6±3.9 Ma), define the most reliable poles for the Kaapvaal Craton during this time interval (c. 2060–1875 Ma) and witness low rates of Mid-Palaeoproterozoic apparent polar wander. Poorly dated NE–NNE-trending dyke swarms that intrude the Phalaborwa and Bushveld complexes both yield dual-polarity remanence components that share a common mean at the 95% confidence level. Primary palaeomagnetic poles (Phalaborwa dykes pole latitude 7.6°, longitude 12.1°, A95 = 11.8°; Bushveld dykes pole latitude 12.6°, longitude 24.1°, A95 = 10.8°) suggest that they are of the same age as the Post-Waterberg dolerites (c. 1875 Ma). They could also be as old as the Phalaborwa and Bushveld Complexes, however; high-precision geochronology is required to resolve this issue and to enlarge the number of Palaeoproterozoic key poles for the Kaapvaal Craton.

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Contents

Geological Society, London, Special Publications

The Formation and Evolution of Africa: A Synopsis of 3.8 Ga of Earth History

D. J. J. Van Hinsbergen
D. J. J. Van Hinsbergen
University of Oslo, Norway
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S. J. H. Buiter
S. J. H. Buiter
Geological Survey of Norway
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T. H. Torsvik
T. H. Torsvik
University of Oslo
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C. Gaina
C. Gaina
Geological Survey of Norway
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S. J. Webb
S. J. Webb
University of the Witwatersrand, South Africa
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Geological Society of London
Volume
357
ISBN electronic:
9781862396050
Publication date:
January 01, 2011

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