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 ?
Although the earliest history of Minudie Anticline movement has been removed by erosion of the diapir crest and flank, seismic data suggest that modest salt movement was taking place during deposition of the Boss Point Formation (Waldron et al.
The quarry's best prehnite comes from the numerous vuggy openings inside diapirs.
Diapirs rising from a larger pool of buoyant magma are important in the ductile lower crust.
The diapir and the bedrock of its surroundings are covered with a thin blanket of Quaternary deposits: till, glaciofluvial gravel and sand, and glaciolacustrine silt and clay.
In contrast to most northern New Jersey quarries, prehnite is uncommon at the Braen quarry, and its distribution is limited to the amygdaloidal and scoriaceous basalt overlying the pillow basalt complex; it is also found in the openings in diapirs.
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.
If these rising diapirs (upwardly mobile rock masses) reach the surface, they form seamounts with a range of characteristics.
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.
The eleven (11) exploration permits ("Kebbouch District Properties"), totalling 42 km2, provide substantial coverage of the crescent-shaped, Jebel Kebbouch diapir extending southwest from its northeastern extremity to the northern and western boundaries of Kebbouch Sud, an exploration permit held by Breakwater Tunisia S.