| 释义 |
lichenometry Geol.|laɪkəˈnɒmɪtrɪ|
[f. lichen n. + -o + -metry.]
The dating of moraines or other surfaces recently exposed for lichen colonization by measurement of the size of lichens growing on them.
1957R. E. Beschel in Arctic (Montreal) X. 60/1 This method that I call lichenometry works well for the last 1,000 years under alpine conditions. 1967Jrnl. Glaciol. VI. 818 The basic premise of lichenometry is that the diameter of the largest lichen thallus growing on a moraine, rock glacier or other surface is proportional to the length of time that the surface has been exposed to colonization and growth. 1973Oxford Times 27 July 6/5 There will also be a botanical study of the glaciers and a lichenometry survey to assist the dating of withdrawal of ice.
Hence lichenoˈmetric, -ˈmetrical adjs.
1958Arctic (Montreal) XI. 254/1 (heading) Lichenometrical studies in West Greenland. 1959Biol. Abstr. XXXIV. 861/2 In several glaciers of the group, a lichenometric study was performed. 1964Geogr. Bull. (Ottawa) Nov. 80 (heading) A lichenometrical study of the north⁓western margin of the Barnes Ice Cap: a geomorphological technique. 1967Jrnl. Glaciol. VI. 819 The wide geographic distribution of the species, together with its long life span and consistent size-age relationship make R[hizocarpon] geographicum ideal for lichenometric dating. |
