diapir


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Related to diapir: piercement

diapir

[′dī·ə‚pir]
(geology)
A dome or anticlinal fold in which a mobile plastic core has ruptured the more brittle overlying rock. Also known as diapiric fold; piercement dome; piercing fold.
References in periodicals archive ?
We attribute this change to the progradation of a megafan-like wedge of sediment from the Caledonia Highlands that caused differential loading, trapping of coarse-grained clastics in proximal areas, rapid salt withdrawal, and pronounced uplift of the Minudie Anticline diapir. The combination of subsidence in the Athol Syncline and uplift of the Minudie Anticline may have caused a short-lived reversal of paleoflow in this part of the basin.
Ainsi, l'ascension de diapirs a partir d'une grande accumulation de magma moins dense que l'encaissant est-il un phenomene important dans la croute inferieure ductile.
This paper employs fully coupled numerical simulations of fluid and heat flow to investigate advective heat transport and the onset of thermal convection adjacent to a salt diapir. In order to independently assess the impact of a near-salt thermal structure on fluid advection and thermal convection, our modeling approach initially omits the effects of salt dissolution by focusing primarily on the interactions between thermal fluid circulation and geologic heterogeneity.
Evidently, the claystone was locally squeezed upwards along the lines of minimum resistance forming a diapir (Vaher & Mardla 1969; Puura & Vaher 1997).
In several places on the shelf, salt diapirs are close enough to the sediment-water interface to form brine pools that remain stable over time owing to continued seepage and the high density of the brine (Brooks et al.
(1996): Rise, closure and reactivation of the Bicorp-Quesa evaporite diapir (eastern Prebetics, Spain).
The limestones and shales are reminiscent of the local Hettangian succession and we have interpreted this anomalous outcrop as being the edge of a salt diapir (see Fig.
1996) or the cap rock on a Carboniferous evaporitic diapir (R.K.
Seismic profiles show the lineations to be related to zones of deformation and diapir collapse near the margins of salt structures.
The result confirms the extension of the Agogo reservoir to the north of the discovery well and below the salt diapirs. The well has been planned and drilled as a highly deviated one, to reach the sequences below the salt diapirs and prove the existence of reservoir and oil charge also in this sector of the Agogo megastructure.