diapir
Definition
Noun: A diapir is a geological structure where a mass of ductile, lower-density rock or salt has flowed upward, piercing and deforming the overlying, more brittle rock layers. This creates a dome-like or mushroom-shaped intrusion.
Usage
The term is used specifically in geology to describe a type of intrusive structure. * The salt dome is a classic example of a diapir. * Geologists studied the diapir to understand the region's tectonic history. * The model shows how the diapir pierced the sedimentary strata.
Advanced Usage
- Diapiric (adjective): Describing the process or characteristics related to a diapir.
- The diapiric intrusion created complex folding in the surrounding rock.
- Diapirism (noun): The process by which diapirs form and rise.
- Salt diapirism is a major factor in the formation of certain oil traps.
Variants and Related Words
- Salt dome: A specific and common type of diapir formed from salt.
- Intrusion: A broader term for any body of igneous rock that has crystallized from magma cooling underground. A diapir is one mechanism of intrusion.
- Piercement structure: A synonym emphasizing the piercing of overlying layers.
Synonyms
- Piercement dome
- Intrusive dome
Related Phrases/Concepts
- Diapirie fold: A fold in rock layers caused by the upward movement of a diapir.
- Diapirie structure: A general term for geological features formed by diapirism.
Noun
-
a domed rock formation where a core of rock has moved upward and pierced through the more brittle overlying strata
