diapir

noun Geology.

1. a dome, or anticline, the upper regions of which have been ruptured and penetrated by material squeezed up from below.Compare plume(def 10), salt dome.

noun

1. geology an anticlinal fold in which the brittle overlying rock has been pierced by material, such as salt, from beneath

1. A fold or dome, such as an anticline, in which the upper strata of sediment or rock have been ruptured by the upward movement of more plastic rock, such as a body of salt, gypsum, or lava.