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Continents Act Like Thermal Blankets: How Continental Drift Will Change Continents In 120 Million Years

Date:
January 30, 2009
Source:
Helmholtz Association of German Research Centres
Summary:
Drifting of the large tectonic plates and the superimposed continents is not only powered by the heat-driven convection processes in the Earth's mantle, but rather retroacts on this internal driving processes. In doing so, the continents function as a thermal blanket, which leads to an accumulation of heat underneath, and which in turn can cause the break-up of the super-continents.

Distribution of the continents in 120 million years.
Credit: Image courtesy of Helmholtz Association of German Research Centres

Drifting of the large tectonic plates and the superimposed continents is not only powered by the heat-driven convection processes in the Earth's mantle, but rather retroacts on this internal driving processes. In doing so, the continents function as a thermal blanket, which leads to an accumulation of heat underneath, and which in turn can cause the break-up of the super-continents.

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Alfred Wegener's theory of continental drift was turned up when the driving forces for continental drift were discovered during the 50s and 60s: The enormous heat in the Earth's core and Earth's mantle generates the flow of rocks within the Earth's mantle, a process similar to the movement of warm water in a cooking pot. This heat-driven mass transport is called convection. On the Earth's surface, this process leads not only to plate movement but also to drifting of the continents floating on the plates.

To date however, there has been no realistic mathematical–physical theory describing the interaction between the convective movement in the Earths mantle and the continental drift. V. Trubitsin, M. Kaban und M. Rothacher from the GFZ have now developed a numerical model, based on the current position of the continents, the structures of the Earth's mantle obtained through geophysical measurements, and the current displacement rates on the surface. Hence they were able to calculate the future position of the continents in hundreds of millions of years.

It could be shown that the enormous heat in the Earth's interior does not generally lead to a chaotic mass transport within the Earth's mantle. On the contrary, the continents influence the heat distribution within the Earth's mantle and the associated convective mass flow. In other words the continents act as a thermal blanket causing heat to accumulate beneath. A self-regulating system develops, beginning and ending with a super-continent. This super-continent breaks apart due to heat accumulation which in turn leads to a reorganization of mantle convection with the pieces ultimately joining again to form a large super-continent.


Story Source:

The above story is based on materials provided by Helmholtz Association of German Research Centres. Note: Materials may be edited for content and length.


Journal Reference:

  1. Trubitsyn et al. Mechanical and thermal effects of floating continents on the global mantle convection. Physics of The Earth and Planetary Interiors, 2008; 171 (1-4): 313 DOI: 10.1016/j.pepi.2008.03.011

Cite This Page:

Helmholtz Association of German Research Centres. "Continents Act Like Thermal Blankets: How Continental Drift Will Change Continents In 120 Million Years." ScienceDaily. ScienceDaily, 30 January 2009. <www.sciencedaily.com/releases/2009/01/090122100828.htm>.
Helmholtz Association of German Research Centres. (2009, January 30). Continents Act Like Thermal Blankets: How Continental Drift Will Change Continents In 120 Million Years. ScienceDaily. Retrieved November 23, 2014 from www.sciencedaily.com/releases/2009/01/090122100828.htm
Helmholtz Association of German Research Centres. "Continents Act Like Thermal Blankets: How Continental Drift Will Change Continents In 120 Million Years." ScienceDaily. www.sciencedaily.com/releases/2009/01/090122100828.htm (accessed November 23, 2014).

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