单词 | peralkaline |
释义 | peralkalineadj. Geology. Of an igneous rock: containing a high proportion of soda and potash; (now) spec. containing a greater proportion of soda and potash combined than that of alumina (cf. peraluminous adj.). ΘΚΠ the world > the earth > structure of the earth > constituent materials > rock > mineral or chemical composition > [adjective] > containing specific mineral siliceous1656 auriferous1744 siliciferous1794 silicited1794 talcose1794 aluminiferous1804 silicated1806 venigenous1817 stanniferous1823 alumiferous1826 quartziferous1831 quartzofeldspathic1839 stannified1855 tinnified1855 acidic1876 lime-silicate1888 peralkalic1902 potassic1902 sodic1902 sodipotassic1902 felsic1912 peralkaline1913 peraluminous1927 1913 A. N. Winchell in Jrnl. Geol. (Chicago) 21 210 Along this co-ordinate igneous rocks are classified as normal or alkali-calcic.., alkaline, and peralkaline. 1950 Rep. 18th Internat. Geol. Congr. 1948 ii. 129 Peralkaline rocks..only occur in stable parts of the earth's crust, outside active orogenic zones. 1993 Jrnl. Petrol. 34 930 Peralkaline granites from Ascension and nepheline syenites from Tenerife are fundamentally different from the cumulate nodules. This entry has been updated (OED Third Edition, September 2005; most recently modified version published online March 2022). < adj.1913 |
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