Science, Creation & EvolutionNoahs Flood is it real, is it global?
The sites you linked to are meant to give the general populace an idea of what Pangea looked like and I think you should be careful about saying 'theories abound' about Pangea. Actually, there really is only one theory about Pangea and several hypotheses about its exact makeup. To the best of my knowledge there is no debate in the geological community about the fact that Pangea existed although there are slight deviations regarding its position at different times during its existence (see for example): Irving, E (2004) The case for Pangea-B, and the intra-Pangean megashear, in Timescales of the Paleomagnetic Field, AGU Geophysical Monograph Series, v 145, p 13-28. and Van der Voo, R. and Torsvik, T.H., 2004, The quality of the European Permo-Triassic poles and its impact on Pangea reconstructions, in Timescales of the Paleomagnetic Field, AGU Geophysical Monograph Series, v 145, p 29-42. The book is available here: https://www.agu.org/cgi-bin/agubookstor ... EGM1454106 Here is an excerpt from the abstract of Irving's article:
This abstract illustrates the nature of the debate quite well, but you'll see it's not about IF Pangea existed. What's even more interesting is that Pangea is only the most recent supercontinent. Geologists have now recognized at least 2 others preceding Pangea (and perhaps more). These are Rodinia that existed from ~1300 Myr to 750 Myr, "Columbia" or "Nuna" that existed around 1900 Myr and also Pannotia that existed fleetingly at the Precambrian-Cambrian boundary. Here are some images of each. They all broke up for the same reason, the buildup of heat beneath the continent. The continents act as a lid on the mantle and cause it to break apart (See Gurnis, 1988 reference below). RODINIA (see also www.scotese.com) PANNOTIA see also: Powell, C. McA. And Pisarevsky, S., 2002. Late Neoproterozoic assembly of East Gondwana, Geology, 30, 3-6. COLUMBIA or NUNA see: Rogers, J.J.W. and Santosh, M., 2002. Configuration of Columbia, a Mesoproterozoic supercontinent, Gondwana Res., 5, 5-22. Here is a cartoon image of how heat builds up under a supercontinental lid and also one of supercontinental breakup BREAKUP See: http://www.rci.rutgers.edu/~schlisch/vaex03.gif Lid Photo SUPERCONTINENTAL LID See: http://gondwanaresearch.com/downwell2.jpg Ref: See also: Gurnis, M. 1988. Large-scale mantle convection and the aggregation and dispersal of supercontinents, Nature, 332, 695-699. -E |
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