Tectonic Position of Karoo Basalts, Western Zambia

  1. Garry D. Mckenzie
  1. Raphael Unrug

Published Online: 21 MAR 2013

DOI: 10.1029/GM040p0319

Gondwana Six: Structure, Tectonics, and Geophysics

Gondwana Six: Structure, Tectonics, and Geophysics

How to Cite

Unrug, R. (1987) Tectonic Position of Karoo Basalts, Western Zambia, in Gondwana Six: Structure, Tectonics, and Geophysics (ed G. D. Mckenzie), American Geophysical Union, Washington, D. C.. doi: 10.1029/GM040p0319

Author Information

  1. Department of Geological Sciences, Wright State University, Dayton, Ohio 45435

Publication History

  1. Published Online: 21 MAR 2013
  2. Published Print: 1 JAN 1987

ISBN Information

Print ISBN: 9780875900643

Online ISBN: 9781118664483

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Keywords:

  • Gondwana(Geology)—Congresses;
  • Geology,Structural—Congresses

Summary

Widespread subsurface occurrences of Karoo basalts are present along the eastern margin of the Barotse basin trending north-northwest in western Zambia and in adjacent parts of Angola. To the south these basalts are continuous with the basalts underlying neighboring parts of Namibia and Botswana and with the Batoka basalts traversed by the Zambezi River gorges east of Victoria Falls. The Barotse basin is a half graben with a step fault zone at its eastern margin that follows a line offsetting structural and geophysical trends in the Pan-African Damaran-Lufilian mobile belt. Faulting and basalt effusions occurred along a zone of structural weakness that possibly represents a Pan-African transcurrent fault. Trends of basalt occurrences in eastern Namibia, northern Botswana, and southern Zambia also follow Pan-African dislocation zones. Karoo volcanism in the center of the African plate is closely related to preexisting lines of structural weakness associated with the Pan-African tectonothermal event.