| 释义 |
silcrete Geol.|ˈsɪlkriːt|
[f. silica + concrete n.]
A quartzite formed of sand grains or pebbles cemented together by silica; a siliceous duricrust.
1902G. W. Lamplugh in Geol. Mag. IX. 575, I have the hardihood to suggest that the term might be complemented by equivalents,—‘silcrete’, for sporadic masses in loose material of the ‘greywether’ type, indurated by a siliceous cement. 1950Antiquity XXIV. 209 More than 90 per cent of these implements are of ‘ferricrete sandstone’, the others being of ‘silcrete sandstone’. 1977A. Hallam Planet Earth 85 Bedrock became deeply weathered to give striking weathering crusts (duricrusts) composed of iron and aluminum oxides (in the case of ferricretes) or silica (in the case of silcretes). |