| 释义 |
Archæan, a. Geol.|ɑːˈkiːən|
[f. Gr. ἀρχαῖ-ος ancient + -an.]
Of or pertaining to crystalline rocks of Pre-Cambrian age (see quots.). Also ellipt. as n.
1872Dana in Amer. Jrnl. Sci. Apr. 253, I propose to use for the Azoic era and its rocks the general term Archæan. 1881C. Fish in Pop. Sc. Monthly XIX. 25 The granitic or Laurentian is of archæan origin. 1882Pall Mall G. 13 Nov. 5/1 The still problematic archæan schists. 1903Geikie Textbk. Geol. (ed. 4) II. vi. i. 861 Pre-Cambrian, also called Archæan. 1944A. Holmes Princ. Physical Geol. vii. 104 The term Archæan refers to the oldest Pre-Cambrian crystalline rocks of a given region. 1944Rastall in Geol. Mag. LXXXI. 159 There is now a marked tendency in international geology to draw a clear distinction between the ancient highly metamorphic continental blocks and the overlying..sedimentary but unfossiliferous groups. These may be conveniently called the Archaean and Algonkian respectively. |