SALT LAYER

This animation shows structure contours on top of the salt. Warm colors represent structural highs; cold colors, structural lows. The map view is lit from the left. Landward, slow aggradation rates (relative to extension rates) favor shallowly buried, steep-sided, overhanging salt walls. Salt walls change markedly along strike, including reactive diapirs with triangular sections, passive stocks, immature salt rollers or ridges, and mature passive walls with overhangs. Although deeply buried salt rollers having gently dipping flanks may form throughout the model, they are more common seaward where aggradation rates rise faster than extension rates. The tallest walls and stocks have flat crests because they reached the surface as passive diapirs. Conversely, lower salt ridges and rollers never reached the surface so retain the pointed crest of a reactive diapir. The mean trend of the salt walls and rollers is roughly perpendicular to the direction of extension. However, their trends vary considerably (red lines in map view), and the salt walls form branching and relay patterns. High stocks curve and decline along strike to form low salt ridges. Branching patterns may connect to form polygons.

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