| 单词 | nepheline-gabbro |
| 释义 | > as lemmasnepheline-gabbro Geology. In the names of rock varieties containing nepheline, as nepheline-basalt, nepheline-gabbro, etc. See also nepheline-syenite n. ΚΠ 1840 London, Edinb., & Dublin Philos. Mag. 17 117 The elæoliths, whether in syenite, miascite, nepheline-rock, albite, &c., do not occur accompanied by free quartz. 1863 J. D. Dana Man. Geol. 89 Nephelinite, nephelin dolerite. 1888 J. J. H. Teall Brit. Petrogr. 360 The olivine-bearing rocks [of nephelinite] are termed nepheline-basalts. 1940 F. F. Grout Kemp's Handbk. Rocks (ed. 6) 288 Theralite, dark nepheline gabbro. 1963 W. A. Deer et al. Rock-forming Minerals II. 109 Titanaugites are the typical pyroxenes of basic alkaline rocks, e.g. teschenite, essexite and nepheline dolerite. 1970 Nature 28 Nov. 850/2 The nepheline gabbro..is a subangular block coated by a thin crust of MnO2... The texture is ophitic and miarolitic. 1990 Jrnl. Petrol. 31 1206 Compared with similarly mafic alkaline basalts from other parts of the world, the nepheline basanites and transitional nephelinites in the Oatlands district are unusually rich in alkali. < as lemmas |
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