dyke-rock
English
editNoun
editdyke-rock (plural dyke-rocks)
- (geology) A type of igneous rock that fills a dyke (a rock filling a fissure that is now often rising above the older stratum that has eroded away).
- 1901, Smithsonian Institution, Board of Regents, Annual Report of the Board of Regents of the Smithsonian Institution, page 427:
- Appears to be a fine-grained dioritic dyke rock, but is too dirty and stained to be satisfactorily examined.
- 1983, B. Simpson, Rock & Minerals, page 88:
- If the dyke is of great thickness the centre may be coarsely crystalline as a deep-seated plutonic rock and this makes it difficult to distinguish a dyke rock in hand specimen.
- 2017, Chris Pellant, Helen Pellant, Geological Structures - An Introductory Field Guide, page 14:
- As a dyke is made of igneous rock, it is usually possible to date it by radiometric dating methods, which give an absolute age for the dyke rock.