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A continent is considered to consist of a mosaic of crustal blocks each 500 to 1 000 km across, the blocks having different cratonization history. Within each block, gravity anomalies of wavelength 20 to 100 km are generally elongated and subparallel. The relative ages of the gravity trends in the adjacent blocks can be determined because those blocks with trends oblique to the boundary are likely to be older than the boundary, whereas those parallel to the boundary are likely to be younger. These major gravity trends are thought to be caused by large-scale folding initiated at the first...

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