Diapir

In Geology, a diapir (of the Greek diapeirein , to bore with through) is a more or less globulous structure, resulting from the increase of lighter rocks through rocks denser.

The heart of the diapir consists of rocks known to be particularly mobile, such as the salt S, (sometimes transformed into Gypse), the magma, the Boue S, etc These rocks go up towards surface under the effect of pushed of Archimedes because they are less dense and have larger ductility than the rocks which surmount them. The mobilization is allotted to the lithostatic Pression overlying rocks.

The physical mechanism is compared with that of a gravitating Instabilité inherent in a Fluide of weak Densité under a heavier fluid: the Instability of Rayleigh-Taylor generated in certain lamps when the heat of the bulb is sufficient to animate the fluid more coloured.

See too

external bond

  • a diapir in seismic reflection on the site of the USGS

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