magmaticadj.
/maɡˈmatɪk/, U.S. /mæɡˈmædɪk/ Geology.
Of or relating to magma.
ΘΚΠ
the world > the earth > structure of the earth > constituent materials > [adjective] > material beneath crust
magmatic1890
1890 in Cent. Dict. Magmatic.
1891 Amer. Naturalist 25 1121 Magmatic corrosion of porphyritic crystals, and fragments in the breccia.
1903 A. Geikie Text-bk. Geol. (ed. 4) II. 808 (heading) Magmatic ores.
1910 Encycl. Brit. III. 513/2 The modifications of the granite are ascribed to magmatic segregation (chemical and physical processes which occasioned diffusion of certain components towards the cooling surfaces).
1933 Geogr. Jrnl. 81 332 Magmatic movement, however caused, has been a factor in the formation of the Rift Valleys.
1957 G. E. Hutchinson Treat. Limnol. I. i. 33 Intermittent volcanic activity..repeatedly drew off material from the magmatic reservoir.
1990 C. Pellant Rocks, Minerals & Fossils 77/1 The igneous rocks called carbonatites are of magmatic origin.
Derivatives
magˈmatically adv. as regards magma; from or by means of magma.
ΘΚΠ
the world > the earth > structure of the earth > constituent materials > [adverb] > as regards magma
magmatically1947
1947 Jrnl. Geol. (Chicago) 55 330/1 A group of basic intrusions in the Baker quadrangle are all believed to be magmatically related and hence of a single intrusive cycle.
1977 A. Hallam Planet Earth 112 Magmatically derived water, meteoric water..sea water and water contained in deep sedimentary formations have all been found in the cores of porphyry copper deposits.
1988 Nature 28 Apr. 779/1 A cause of controversy is the hypothesis that this accretionary plate boundary is segmented into adjacent but separate spreading cells, each driven magmatically but possibly by different plumes.
This entry has been updated (OED Third Edition, March 2000; most recently modified version published online March 2022).
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adj.1890