| 单词 | white trap |
| 释义 | > as lemmaswhite trap white trap n. Mining (now rare) a pale-coloured altered basaltic rock occurring in coal-bearing formations; cf. trap n.5 ΘΚΠ the world > the earth > structure of the earth > constituent materials > rock > igneous rock > [noun] > trap > basalt > white rock white rock1789 white trap1853 1853 J. B. Jukes in Rec. School Mines 1 ii. 242 The white trap descending from the roof cut both into the coal and the sandstone. 1885 A. Geikie Text-bk. Geol. iv. viii. §2. 560 Microscopical examination shows that this ‘white-rock’ or ‘white-trap’ is merely an altered form of some diabasic or basaltic rock. 1908 W. S. Boulton Pract. Coal-mining I. 45 The sill..was formerly mistaken for a limestone, the original dark-coloured basalt having been converted into a whitish-gray rock, known as ‘white trap’. < as lemmas |
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