| 单词 | trap-porphyry |
| 释义 | > as lemmastrap-porphyry attributive and in other combinations, as trap-dike (dike n.1 9b), trap-granulite, trap-porphyry, trap-rock, trap-shale, trap-stone, trap-tuff. ΘΚΠ the world > the earth > structure of the earth > constituent materials > rock > igneous rock > [noun] > trap trap1794 trap-tuff1794 amygdalite1811 1794 R. Kirwan Elements Mineral. (ed. 2) I. 355 Trap Porphyry..sometimes..abounds..in quartz and felspar. 1811 A. Boswell Poet. Wks. (1872) 102 Beneath his feet the trap~stone rung. 1813 R. Bakewell Introd. Geol. v. 100 Rocks in which hornblende forms a predominating ingredient, have been denominated trap rocks. 1821 R. Jameson Man. Mineral. 401 Secondary Trap... The following are the different kinds of these rocks,..Greenstone;..Syenite;..Amygdaloid;..Wacke;..Basalt; and..Trap tuff. 1839 R. I. Murchison Silurian Syst. v. 78 This intrusion having taken place on a line of ancient volcanic eruption, the origin of which cannot be understood without a previous acquaintance with the history of the Silurian System, the account of this new red trap dyke is necessarily deferred. 1842 A. Sedgwick in Hudson's Guide Lakes (1843) 241 Plumbago..has..been found among coal strata near the sides of ‘trap dykes’. 1853 A. Sedgwick in J. Phillips Man. Geol. (1855) 102 Roofing-slate,..alternating..with porphyry, trappean conglomerate, trap-shale. 1855 J. Phillips Man. Geol. 187 There are no trap dikes in this coal field. 1867 J. H. Burton Hist. Scotl. to 1688 I. ii. 57 It is a small bar of trapstone. 1881 Prevost in Knowledge No. 5. 85 The trap rocks, divisible into two great classes, called diorite and dolerite, contain soda, lime, magnesia, and potash. < as lemmas |
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