Constraints on the tectonic evolution of the Namaqua Province III: palaeomagnetic and 40 Ar/39Ar results from the Gannakouriep dyke swarm ( South Africa).

Tullis C. Onstott, R. B. Hargraves, D. L. Reid

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

Palaeomagnetic samples were collected from 2 dykes belonging to the Gannakouriep dyke swarm, one located in the centre of the Richtersveld subprovince (8215), the other further S in the Steinkopf Domain (8212), where it has been clearly overprinted by a later metamorphic episode. Detailed thermal and A.F. demagnetization indicate that the primary remanence has been extensively overprinted in both dykes. The 40Ar/39Ar step-heating analyses of a whole-rock sample of the 8212 yield a plateau spectrum with an integrated age of 542 + or - 4 Ma; whereas, the 40Ar/39Ar spectrum for a whole-rock sample of 8215 yields a saddle-shaped spectrum with the minimum at approx 400 Ma.-from Authors

Original languageEnglish (US)
Pages (from-to)171-183
Number of pages13
JournalTransactions - Geological Society of South Africa
Volume89
Issue number2
StatePublished - Jan 1 1986

All Science Journal Classification (ASJC) codes

  • Environmental Science(all)
  • Engineering(all)
  • Earth and Planetary Sciences(all)

Fingerprint Dive into the research topics of 'Constraints on the tectonic evolution of the Namaqua Province III: palaeomagnetic and <sup>40</sup> Ar/<sup>39</sup>Ar results from the Gannakouriep dyke swarm ( South Africa).'. Together they form a unique fingerprint.

  • Cite this