How are mineral grains oriented differently at the center and edge of some salt domes?

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salt dome Figure 1: Interrelationships of salt structures (see text)

In the study of salt domes, research into the orientation of mineral grains reveals complex patterns that vary both vertically and horizontally within the salt mass. Specifically, observations of a Caspian salt dome have shown that mineral grains located in the center of the dome are oriented vertically, while those found at the edge of the dome are oriented horizontally.1