| 释义 |
Scourian, a. Geol.|ˈskʊrɪən, ˈskaʊrɪən|
[f. Scourie, name of a crofting village on the west coast of Sutherland + -an.]
Of, pertaining to, or designating the earlier metamorphism undergone by the Lewisian rocks of the Pre-Cambrian in NW Scotland, the rocks formed by this metamorphism, and the structures to which they belong. Also absol., these rocks and structures.
1950Sutton & Watson in Q. Jrnl. Geol. Soc. CVI. 243 In the following pages the Lewisian is..regarded as belonging to two metamorphic complexes, the first, or Scourian, being older and the second, or Laxfordian, younger than the dolerite dykes. These names are taken from localities in Sutherland where the relations of the two complexes are particularly clearly displayed. 1959Nature 5 Dec. 1793/1 Three samples came from the Outer Hebrides, three from the Laxfordian, and two from the Scourian. 1961Q. Jrnl. Geol. Soc. CXVII. 241 The Scourian metamorphic rocks in the vicinity of Scourie are primarily hornblende- or pyroxene-bearing gneisses containing very little mica or potassium-feldspar. Ibid. 242 The Scourian metamorphism occurred at least 2460 m.y. ago. 1965A. Holmes Princ. Physical Geol. (ed. 2) xiii. 370 (caption) The peaks are of Torridonian Sandstone, resting unconformably on Lewisian Gneiss (Scourian division). 1969Bennison & Wright Geol. Hist. Brit. Isles iii. 42 The trend of the Scourian is not known since no really large structures have been found associated with the granulites. 1979Nature 22 Feb. 643/1 The ∼2,400 Myr age for the emplacement of the Scourie dyke swarm indicates that the Scourian tectonic episode had ceased by the beginning of the Proterozoic. |