| 释义 |
peraluminous, a. Petrol.|pɜːrəˈl(j)uːmɪnəs|
[f. per-1 4 + aluminous a.]
Of a rock: (see quots. 19741 (and 1931), 1972).
1927,1931[see peralkaline a.]. 1964Mineral. Abstr. XVI. 488/2 A peraluminous granite stock and related pegmatites..have been emplaced in pelitic and quartzo⁓feldspathic schists. 1972Gloss. Geol. (Amer. Geol. Inst.) 527/1 Peraluminous, said of an igneous rock in which the molecular proportion of aluminum oxide is greater than that of sodium and potassium oxide combined. 1974I. S. E. Carmichael et al. Igneous Petrology ii. 31 This leads to four more classes of rocks, each independent of silica saturation: 1. Peraluminous rocks, in which the molecular proportion of Al2O3 exceeds (CaO + Na2O + K2O)... 4. Peralkaline rocks, in which Al2O3 2O + K2O). 1974W. C. Luth in H. Sørensen Alkaline Rocks vi. vi. 506/1 Several key factors provide limiting conditions. These include..the relatively large amounts of the peraluminous hydrates required. |