CONSTRAINTS ON THE MOTIONS OF SOUTH AMERICAN AND AFRICAN SHIELDS DURING THE PROTEROZOIC: I. 40Ar/39Ar AND PALEOMAGNETIC CORRELATIONS BETWEEN VENEZUELA AND LIBERIA.

Tullis C. Onstott, R. B. Hargraves, Derek York, Chris Hall

Research output: Contribution to journalArticle

53 Scopus citations

Abstract

The Encrucijada pluton of Venezuela and amphibolites near Harper, Liberia, are located on opposite sides of the Liberian Pan-African mobile belt, when South America is restored in a fit described in the literature with respect to Africa. Both units yield stable, bipolar, high-temperature magnetizations that appear to be indistinguishable in age at 1. 9 to 2. 0 Ga. With South America in this reconstruction, the corresponding paleomagnetic poles suggest that 1000 km of right-lateral strike-slip motion has occured between the West African and Guayana Shields. The Encrucijada and Harper poles are distinct from the 1. 9- to 2. 0-Ga paleomagnetic poles from the Kalahari Shield and suggest that relative motion has occurred between the Kalahari Shield and the West African and Guayana Shields since that time. Refs.

Original languageEnglish (US)
Pages (from-to)1045-1054
Number of pages10
JournalBulletin of the Geological Society of America
Volume95
Issue number9
DOIs
StatePublished - Jan 1 1984

All Science Journal Classification (ASJC) codes

  • Geology

Fingerprint Dive into the research topics of 'CONSTRAINTS ON THE MOTIONS OF SOUTH AMERICAN AND AFRICAN SHIELDS DURING THE PROTEROZOIC: I. <sup>40</sup>Ar/<sup>39</sup>Ar AND PALEOMAGNETIC CORRELATIONS BETWEEN VENEZUELA AND LIBERIA.'. Together they form a unique fingerprint.

  • Cite this