Amasia the Next Supercontinent Movie 1

Amasia the Next Supercontinent Movie 1 Movie 1: This movie corresponds to the orthoversion model, wherein the minimum moment of inertia (Imin) shifts 90° between supercontinents (nature10800-s2.mov). Meet &the Next Supercontinent Reference Supercontinent cycles and the calculation of absolute palaeolongitude in deep time Nature Volume: 482, Pages: 208--211 09 February 2012 DOI: doi:10.1038/nature10800 Abstract Traditional models of the supercontinent cycle predict that the next supercontinent—&form either where Pangaea rifted (the &model) or on the opposite side of the world (the &models). Here, by contrast, we develop an &model whereby a succeeding supercontinent forms 90° away, within the great circle of subduction encircling its relict predecessor. A supercontinent aggregates over a mantle downwelling but then influences global-scale mantle convection to create an upwelling under the landmass. We calculate the minimum moment of inertia about which oscillatory true polar wander occurs owing to the prolate shape of the non-hydrostatic Earth5, 7. By fitting great circles to each supercontinent&true polar wander legacy, we determine that the arc distances between successive supercontinent centres (the axes of the respective minimum moments of inertia) are 88° for Nuna to Rodinia and 87° for Rodinia to Pangaea—as predicted by the orthoversion model. Supercontinent centres can be located back into Precambrian time, providing fixed points for the calculation of absolute...