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extrusive

   Also found in: Encyclopedia, Wikipedia 0.01 sec.
ex·tru·sive  (k-strsv, -zv)
adj.
1. Tending to push or thrust out.
2. Tending to protrude or project.
3. Derived from magma poured out or ejected at the earth's surface. Used of igneous rocks.

extrusive [ɪkˈstruːsɪv]
adj
1. tending to extrude
2. (Earth Sciences / Geological Science) (of igneous rocks) formed from magma issuing from volcanoes or cracks in the earth's crust; volcanic Compare intrusive [2]
ThesaurusLegend:  Synonyms Related Words Antonyms
Adj.1.extrusive - of rock material; forced out while molten through cracks in the earth's surface
geology - a science that deals with the history of the earth as recorded in rocks
intrusive - of rock material; forced while molten into cracks between layers of other rock


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This can happen above ground as with volcanoes it is then called extrusive.
For example, it has long been thought that the primary source of marine magnetic anomalies lies in the upper, extrusive section of the oceanic crust.
But studies of ophiolites suggested that the structure of the crust was more complex: The basalts in the upper, extrusive layer had different compositions and magnetic properties than the underlying layer of so-called sheeted dikes (relicts of the channels used by lavas to get to the surface).
 
 
 
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