Extensional tectonics and the fragmentation of Gondwanaland
- 1 January 1987
- journal article
- Published by Geological Society of London in Geological Society, London, Special Publications
- Vol. 28 (1) , 433-441
- https://doi.org/10.1144/gsl.sp.1987.028.01.27
Abstract
Summary: Evidence of widespread lithospheric extension, bimodal volcanism, and uplift and erosion, accompanying the fragmentation of Gondwanaland, is reviewed. One regime of extensional phenomena appears to be intimately associated with a Pacific-margin convergent-plate regime. A second appears to bear no direct geometrical relationship to the margin, but may reflect a thermal anomaly that resulted in the breakup of Gondwanaland. Possible causes of this anomaly are discussed. The two regimes overlap in space and time in the South Atlantic-Weddell Sea area. A causal relationship between the two is possible but remains non-proven.Keywords
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