| 释义 |
Laxfordian, a. Geol.|læksˈfɔːdɪən|
[f. Laxford, name of a loch and river in the north of Scotland + -ian.]
Of, pertaining to, or designating the later metamorphism undergone by the Lewisian rocks of the Precambrian in north-west 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. 1969Bennison & Wright Geol. Hist. Brit. Isles iii. 44 On the Outer Isles the Laxfordian orogeny is dominant, much of Harris and Lewis being composed of a migmatite complex of Laxfordian age. 1973Nature 6 July 10/2 The whole rock date of 1,670 {pm} 24 m.y. and that on hornblende at 1,566 {pm} 33 m.y. indicate a Laxfordian age for the material. 1991R. G. Park in G. Y. Craig Geol. Scotl. (ed. 3) 26 The main Laxfordian event is dated at c .1,800 Ma. |