Laccolith - définition. Qu'est-ce que Laccolith
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Qu'est-ce (qui) est Laccolith - définition

LENTICULAR IGNEOUS INTRUSION WITH A RAISED CENTRAL REGION
Laccolite; Laccoliths
  • Sill]]<br>
6. [[Volcanic neck]], pipe<br>
7. [[Lopolith]]<br>
Note:  As a general rule, in contrast to the smoldering volcanic vent in the figure, these names refer to the fully cooled and usually millions-of-years-old rock formations, which are the result of the underground magmatic activity shown.
  • Cross section]] of a laccolith intruding into and deforming strata
  • Idealized laccolith shape

Laccolith         
·noun A mass of igneous rock intruded between sedimentary beds and resulting in a mammiform bulging of the overlying strata.
laccolith         
['lak?l??]
¦ noun Geology a lens-shaped mass of igneous rock intruded between rock strata, causing doming.
Origin
C19: from Gk lakkos 'reservoir' + -lith.
Laccolith         
A laccolith is a body of intrusive rock with a dome-shaped upper surface and a level base, fed by a conduit from below. A laccolith forms when magma (molten rock) rising through the Earth's crust begins to spread out horizontally, prying apart the host rock strata.

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Laccolith

A laccolith is a body of intrusive rock with a dome-shaped upper surface and a level base, fed by a conduit from below. A laccolith forms when magma (molten rock) rising through the Earth's crust begins to spread out horizontally, prying apart the host rock strata. The pressure of the magma is high enough that the overlying strata are forced upward, giving the laccolith its dome-like form.

Over time, erosion can expose the solidified laccolith, which is typically more resistant to weathering than the host rock. The exposed laccolith then forms a hill or mountain. The Henry Mountains of Utah, US, are an example of a mountain range composed of exposed laccoliths. It was here that geologist Grove Karl Gilbert carried out pioneering field work on this type of intrusion. Laccolith mountains have since been identified in many other parts of the world.