dyke-rock

English

Noun

dyke-rock (plural dyke-rocks)

1. (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.