Paleomagnetism of a Neoarchean-Paleoproterozoic carbonate ramp and carbonate platform succession (Transvaal Supergroup) from surface outcrop and drill core, Griqualand West region, South Africa

M. O. de Kock, D. A.D. Evans, J. L. Kirschvink, N. J. Beukes, E. Rose, I. Hilburn

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

Detailed paleomagnetic study across the Archean-Paleoproterozoic boundary interval preserved in the Ghaap Group, Transvaal Supergroup, of the Kaapvaal craton reveals a complex series of viscous and thermo-chemical magnetic overprints. Despite this complex history, a potential primary single-polarity remanence direction was revealed at high-temperature demagnetization steps in about 10% of orientated drill core samples only. This component (declination = 132°, inclination = 69°) was not identified in any of the outcrop sites. Overprint directions include a present geomagnetic field remanence and a very well developed thermo-chemical overprint (declination = 359°, inclination = 54°), which is believed to be associated with a ∼2.0 Ga regional thermal event and the development of extensive epigenetic Pb-Zn deposits. At higher levels of demagnetization, two shallow west-directed components appear to be related to the extrusion of the Ongeluk Formation lava at 2.22 Ga (declination = 268°, inclination = -20°; eastern parts of the studied region) and to the post-1.92 Ga Kheis orogeny (declination = 272°, inclination = 16°; exclusive to the western margin of the study area), respectively.

Original languageEnglish
Pages (from-to)80-99
Number of pages20
JournalPrecambrian Research
Volume169
Issue number1-4
DOIs
Publication statusPublished - Mar 2009

Keywords

  • Apparent polar wander path
  • Epigenetic mineralization
  • Paleomagnetism
  • Paleoproterozoic
  • Remagnetization
  • South Africa

ASJC Scopus subject areas

  • Geology
  • Geochemistry and Petrology

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