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 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.
Diapirs rising from a larger pool of buoyant magma are important in the ductile lower crust.
Salt diapirs, salt brine seeps, pockmarks and surficial sediment creep and slides in the Canary Channel off NW Africa.
Diapirs of mud and shale may also pierce the prism.
With a total of 42 km2, Aurora will have 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.
As in Arab waters, where salt has punched to the surface, the diapirs produce small islands and the salt pillars have caused minimal disturbance to the over-lying strata.
In the Southern Caspian, massive sedimentation during the last five million years was a main reason for extremely high over-pressures, low temperature gradients and mud diapirs, the latter being bodies highly saturated in gas.
These so-called "hotspots", for example Hawaii, are postulated to arise from up-welling diapirs with magma from the core - mantle boundary, 3,000 km deep in the Earth.
It has been suggested that a large proportion of Gachsaran salt was re-precipitated from Hormuz salt, extruded in diapirs east of the Kazerun Fault [19; 17].
The question is whether melting anomalies at the earth's surface are fueled by hot diapirs from the deep mantle--the plume hypothesis--or arise from shallow processes ultimately related to plate tectonics--the plate hypothesis.
The location of each whale shark sighting was plotted on navigational charts, produced by the National Oceanic and Atmospheric Administration (Chart numbers 11006, 11300, 11340), to examine the associations of whale sharks with bathymetric features such as reefs and salt diapirs.