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extrusive

   Also found in: Encyclopedia, Wikipedia, Hutchinson 0.02 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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? Mentioned in ? References in periodicals archive
 
4 million cubic km (Coffin and Eldholm, 2001) for combined extrusive (6 million cubic km) and intrusive components (Courtillot and Renne, 2003).
Igneous rock associations in Canada 3. Large Igneous Provinces (LIPs) ... by Buchan, K.L. / Geoscience Canada
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).
Deep source of magnetic stripes by Weisburd, Stefi / Science News
He was engaged by the company to examine volcanic extrusive and intrusive rocks and their contact relationships with one another, and to give his opinion as to whether they were pre- or post-mineral in age and whether they were part of a caldera sequence.
Liberty Star Completes Field Work for the 2005 Season on the Big ... by Business Wire
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