Advertisement

Fragmentation and Mesozoic Paleogeography

  • A. J. Tankard
  • M. P. A. Jackson
  • K. A. Eriksson
  • D. K. Hobday
  • D. R. Hunter
  • W. E. L. Minter

Abstract

Fragmentation of Gondwana took place in two phases. Between 190 Ma and 160 Ma, separation followed a line down the eastern flank of the Mozambique Ridge (Dietz and Holden, 1970; Scrutton, 1973b; Kutina, 1975; Du Toit, 1976). This line of fracture paralleled the trend of the Lebombo rhyolites and tholeiitic basalts, a zone of crustal rupture that preceded drift by about 20 Ma (see Chapter 11). Volcanic activity also preceded the separation of South America from Africa and the initiation of the South Atlantic, which took place in the second phase of fragmentation between 135 Ma and 130 Ma (Siedner and Mitchell, 1976; K-Ar). The age of the oldest magnetic anomalies in the Cape Basin west of Cape Town are in close agreement with the Kaokoveld-Serra Geral volcanic activity (Larson and Ladd, 1973).

Keywords

Magnetic Anomaly Late Jurassic Antarctic Peninsula Fossil Wood South American Plate 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Copyright information

© Springer-Verlag New York, Inc. 1982

Authors and Affiliations

  • A. J. Tankard
    • 1
  • M. P. A. Jackson
    • 2
  • K. A. Eriksson
    • 3
  • D. K. Hobday
    • 4
  • D. R. Hunter
    • 5
  • W. E. L. Minter
    • 6
  1. 1.Petro-CanadaCalgaryCanada
  2. 2.Bureau of Economic GeologyThe University of Texas at AustinAustinUSA
  3. 3.Department of Geological SciencesVirginia Polytechnic Institute and State UniversityBlacksburgUSA
  4. 4.Department of Geology and GeophysicsUniversity of SydneySydneyAustralia
  5. 5.Department of Geology and MineralogyUniversity of NatalPietermaritzburgSouth Africa
  6. 6.Anglo American Corporation of South AfricaWelkomSouth Africa

Personalised recommendations