Amasia (supercontinent)
Amasia is the working title[1] for a possible future supercontinent that could be formed by the merger of Asia and North America. This prediction relies mostly on the fact that the Pacific Plate is already subducting under Eurasia and North America, a process which if continued will eventually cause the Pacific to close.[2] Meanwhile, because of the Atlantic mid-ocean ridge, North America would be pushed westward. Thus, the Atlantic at some point in the future would be larger than the Pacific. In Siberia, the boundary between the Eurasian and North American Plates has been stationary for millions of years. The combination of these factors would cause North America to be combined with Asia, thus forming a supercontinent. A February 2012 study predicts Amasia will form over the North Pole, in about 50 million to 200 million years.[3]
Alternative scenarios
Paleogeologist Ronald Blakey has described the next 15 to 100 million years of tectonic development as fairly settled and predictable[4] but no supercontinent will form in that time frame. Beyond that, he cautions that the geologic record is full of unexpected shifts in tectonic activity that make further projections "very, very speculative".[4] In addition to Amasia, two other hypothetical supercontinents—Christopher Scotese's "Pangaea Ultima" and Roy Livermore's "Novopangea"—were illustrated in an October 2007 New Scientist article.[5]
See also
References
- ^ Bowdler, Neil (2012-02-08). "America and Eurasia 'to meet at north pole'". BBC News. Retrieved 2012-02-08.
- ^ Wilkins, Alasdair. "A Geological History of Supercontinents on Planet Earth" at io9. 27 Jan 2011. Accessed 22 July 2014.
- ^ Smith Kerri, Supercontinent Amasia to take North Pole Position, Nature.com, 8 Feb 2012
- ^ a b Manaugh, Geoff & al. "What Did the Continents Look Like Millions of Years Ago?" in The Atlantic online. 23 Sept 2013. Accessed 22 July 2014.
- ^ Williams, Caroline; Nield, Ted (20 October 2007). "Pangaea, the comeback". New Scientist. Archived from the original on 13 April 2008. Retrieved 4 August 2016.
Further reading
- Nield, Ted, Supercontinent: Ten Billion Years in the Life of Our Planet, Harvard University Press, 2009, ISBN 978-0674032453
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