Answers to question for: Pangea, Gondwanaland
and the supercontinent hypothesis.
will be modification processes that create gaps or overlaps?
- variable character of crustal thinning:
- diachronous rifting.
- different degrees of continental extension before seafloor spreading intiates can produce overlaps, locked zones of Courtillot and Vink.
- localized deposition, e.g. Niger delta.
- internal plate deformation (e.g. Benue trough).
- missing continental slivers rafted out into the ocean basin.
- differing thermal and hotspot histories.
described the super continent cycle is far reaching. What does
it not explain, or what might be difficulties?
- Why does the cycle span stay the same when
heat flow rates changed 2 fold over the life time the cycle is
thought to have operated?
- Rifting dispersion in the case of the break-up
of Gondwanaland was over some 200 Ma. This should complicate
the simple cycles they see.
- Why are some supercontinents long lived and some short lived?
- How does the suspect/exotic terrane paradigm
fit into this?
Course materials for Plate Tectonics, GEOL
3700, University of Nebraska at Omaha. Instructor: H. D. Maher
Jr., copyright. This material may be used for non-profit educational
purposes with appropriate attribution of authorship. Otherwise
please contact author.