The Gondwanian Orogeny Within the Antarctic Peninsula: a Discussion

  1. Garry D. Mckenzie
  1. B. C. Storey,
  2. M. R. A. Thomson and
  3. A. W. Meneilly

Published Online: 21 MAR 2013

DOI: 10.1029/GM040p0191

Gondwana Six: Structure, Tectonics, and Geophysics

Gondwana Six: Structure, Tectonics, and Geophysics

How to Cite

Storey, B. C., Thomson, M. R. A. and Meneilly, A. W. (1987) The Gondwanian Orogeny Within the Antarctic Peninsula: a Discussion, in Gondwana Six: Structure, Tectonics, and Geophysics (ed G. D. Mckenzie), American Geophysical Union, Washington, D. C.. doi: 10.1029/GM040p0191

Author Information

  1. British Antarctic Survey, Natural Environment Research Council, High Cross, Cambridge Cb3 Oet, United Kingdom

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

The relevance of the term “Gondwanian orogeny” to deformation within upper Paleozoic to Mesozoic rocks of the Antarctic Peninsula is reviewed, and the tectogenesis of deformation within this time frame is discussed. The term, originally applied by du Toit to deformation of middle Paleozoic to lower Mesozoic rocks in the Samfrau geosyncline, has been used extensively in Antarctic literature . However, the Gondwanian fold belt includes deformed regions of significantly different ages. For example, in southern Africa the Gondwanide Cape folding is a singlephase multiple-event period of deformation which spanned the beginning of the Permian to the Middle Triassic, a period of approximately 50 m.y. In the Antarctic Peninsula, although data are insufficient to reconstruct a full tectonic history, the Gondwanian orogen is now known to include rocks and structures of a younger age. The only ages which presently fall within the above time frame are some estimates of a period of metamorphism whose tectonic significance is uncertain. The authors favor the use of the term “Peninsula orogeny” for deformation of Triassic and Early Jurassic rocks below the “Peninsula unconformity” in preference to the term Gondwanian orogeny.