Construction of the Pacific Margin Of Gondwana During The Pannotios Cycle
- Garry D. Mckenzie
Published Online: 21 MAR 2013
Copyright 1987 by the American Geophysical Union.
Gondwana Six: Structure, Tectonics, and Geophysics
How to Cite
Stump, E. (1987) Construction of the Pacific Margin Of Gondwana During The Pannotios Cycle, in Gondwana Six: Structure, Tectonics, and Geophysics (ed G. D. Mckenzie), American Geophysical Union, Washington, D. C.. doi: 10.1029/GM040p0077
- Published Online: 21 MAR 2013
- Published Print: 1 JAN 1987
Print ISBN: 9780875900643
Online ISBN: 9781118664483
A cycle of sedimentation and tectonism affected the supercontinent of Gondwana from the middle or late Proterozoic until its culmination at approximately 500 Ma. This paper is a synthesis of the activity that occurred along the Pacific margin of the supercontinent in portions of present-day South America, Africa, Antarctica, and Australia. The cycle began at approximately 900 Ma with sedimentation in basins bounded and, in many cases, floored by older cratonic basement. Tectonism began in the late Precambrian in a zone from the Ribeira and Damara belts of South America and southern Africa through to the central Transantarctic Mountains. A narrow septum of cratonic rocks, unaffected by late Precambrian tectonism, is postulated to have extended from the Haag Nunataks in Antarctica through the Falkland Islands to the Rio de la Plata craton in South America. During Early and Middle Cambrian, sedimentation was renewed in regions affected by late Precambrian tectonism, and continued in the unaffected regions of South America, Antarctica, and Australia. Tectonism culminated in Cambro-Ordovician time, affecting both a more cratonal belt, where tectonism ceased, and a more marginal belt, where tectonism was renewed during the middle Paleozoic. The name Pannotios is proposed as a unifying term to encompass the late Precambrian-early Paleozoic cycle of activity that occurred throughout Gondwana.