peralkalineadj.
/pəːˈralkəlʌɪn/, U.S. /pərˈælkələn/, /ˌpərˈælkəˌlaɪn/ 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).
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adj.1913