One of the mysteries of the English language finally explained.
A domed rock formation in which a core of rock has moved upward to pierce the overlying strata.
- ‘The established idea that granitoid magmas ascend through the continental crust as diapirs is being increasingly questioned by igneous and structural geologists.’
- ‘Various architectures connecting extrusive mud volcanic cones to their underlying source layer have been described, ranging from bulbous diapirs to steep diatremes and narrow vertical pipes.’
- ‘Mud diapirs, pockmarks and mud volcanoes are common features at seepage sites, where various pathways such as faults, other fractures and sedimentary discontinuities act as conduits for fluid seepage.’
- ‘In more thickly sedimented slope and basin blocks, this fault and parallel faults to the south are marked by ENE alignments of elongate and shear mud diapirs or continuous, narrow mud walls.’
- ‘Essentially, this means that over geological timescales, diapirs flow through the sub-surface.’
Early 20th century: from Greek diapeirainein ‘pierce through’, from dia ‘through’ + peirainein (from peran ‘pierce’).
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