| 释义 |
siallite Geol.|ˈsaɪəlaɪt|
[ad. G. siallit (H. Harrassowitz 1926, in Fortschr. Geol. Palæont. IV. 263), f. as sial: see -ite1.]
Weathered rock that is largely composed of hydrous aluminium silicates and is highly leached of alkalis. So siaˈllitic a.
1933H. Greene tr. Vageler's Introd. Tropical Soils v. 127 Where the amount of water is small and the period of action is short, as in the case of arid and semi-arid districts, siallitic and allitic bodies are formed in small amount. Ibid. 140 The soil becomes podsolised. The long-held opinion that this produces not merely siallites in general but a quite special kaolin and kaolinite can no longer be maintained. 1965B. T. Bunting Geogr. of Soil xiv. 168 Other forms of brown earth are formed on siallitic parent materials which may overlie chalk. |