spec. in Geology. The influx of rock in a state of fusion into fissures or between strata; a portion of intruded rock.
| 单词 | θ4889 |
| 释义 | the world > the earth > structure of the earth > structural features > discontinuity or unconformity > [noun] > intrusion (36) intrusion1839 spec. in Geology. The influx of rock in a state of fusion into fissures or between strata; a portion of intruded rock. intrusive1895 An intrusive rock or rock mass. emplacement1914 Geology. The action or process by which a body of (usually igneous) rock or ore is placed in position; esp. = intrusion, n. 1b. Also: an instance… pluton1934 A large body of intrusive igneous rock. facies1965 Geology. The character of a part of a formation distinguished by differentiating qualities such as the fossils it contains, the composition and… Subcategories:— branch of (1) — ring (1) — boss (2) — lens (3) — plug (3) — ridge (1) — lateral (1) — dike (3) — sill (2) — others (10) — roof pendant (1) — host (3) |
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