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Related to diapir: piercement


A geological structure formed when a mass of material of high plasticity and low density, such as salt, gypsum, or magma, pushes upward into overlying strata.

[French, from Greek diapeirein, to push through : dia-, dia- + peirein, to pierce; see per- in Indo-European roots.]

di′a·pir′ic adj.


(Geological Science) geology an anticlinal fold in which the brittle overlying rock has been pierced by material, such as salt, from beneath
[C20: from Greek diapeirainein to make holes through, pierce]


(ˈdaɪ əˌpɪər)

an anticline of rock the upper regions of which have been penetrated by material from below.
[1915–20; < French < Greek diapeírein to drive through]
di`a•pir′ic (-ˈpɪr ɪk) adj.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.diapir - a domed rock formation where a core of rock has moved upward and pierced through the more brittle overlying strata
geology - a science that deals with the history of the earth as recorded in rocks
geological formation, formation - (geology) the geological features of the earth
References in periodicals archive ?
1992), it is also broadly parallel to the trend of the salt-cored Minudie Anticline and may record paleoflow deflection by the diapir.
A diapir is thought to be a cooling feature which reflects the uneven downward movement of the solidification front (Cummings, personal communication, 2009).
The EFG is a deep reef atop a salt diapir (Bright & Powell 1983, Gardner et al.
a small hill 12 m elevated (where the city is located) is a topographic effect of the diapir process that started in the end of ice age (that makes an average value of the process rate about 1 mm/yr).
The rise of a diapir is self-limiting because its buoyancy decreases as it rises (the density of rocks surrounding the magma decreases as the surface is approached and magma becomes denser as it cools).
Although some questions remain concerning their formation and evolution, they are generally considered to be the result of rising plumes of magma (diapirs) which reach the surface, push the crust upward, and then collapse (like a badly cooked souffle) after the diapir cools (Basilevsky and Head, 2003).
2002, Geophysical surveys for detecting subsidence and collapse areas at Cardona salt diapir (Catalonia, Spain), Proceedings of the 9th Environmental and Engineering Geophysics.
Evidently, the claystone was locally squeezed upwards along the lines of minimum resistance forming a diapir (Vaher & Mardla 1969; Puura & Vaher 1997).
Fluid drives are not well constrained by our data, but both fluid types are focused along major faults that cross cut the platform edge and are associated with diapir tectonics.
Salt blocks buried in silt appear on the surface of the valleys of the Jgheab, Meledic, Paraul Sarat rivers, as salt diapir structures.
The emplacement process of this pluton will fit better a description of emplacement-ascent driven by buoyancy and regional stress as a viscoelastic diapir in the sense of Miller and Paterson (1999), where the rheologic behavior of the country rock varies both temporally and spatially from brittle to ductile.