metasomaticadj.
/ˌmɛtəsə(ʊ)ˈmatɪk/, U.S. /ˈˌmɛdəsəˈmædɪk/ 1. Geology. Of or relating to metasomatism; of the nature of, produced by, or involved in metasomatism.
ΘΚΠ
the world > the earth > structure of the earth > formation of features > metamorphism > [adjective] > metasomatism
metasomatic1878
metasomatized1955
1878 R. Pumpelly in Proc. Amer. Acad. Arts & Sci. 1877–8 13 253 (title) Metasomatic development of the copper-bearing rocks of Lake Superior.
1895 C. R. Van Hise in 16th Ann. Rep. U.S. Geol. Surv. 1894–5: Pt. 1 690 Minerals..produced from other minerals by metasomatic processes.
1916 J. J. Sederholm in Bull. Comm. Géol. Finlande 9 xlviii. 142 It would be advisable to discriminate between..metasomatic changes which belong to a later period of metamorphism..and those which have taken place in direct continuation of the consolidation of the magma of the rock itself.
1960 F. J. Turner & J. Verhoogen Igneous & Metamorphic Petrol. (ed. 2) xxii. 592 Crystalloblastic, a term introduced by Becke to cover structures of the crystalline schists but nowadays generally extended to include also fabrics of like origin and character in rocks resulting from contact or metasomatic metamorphism.
1985 R. Thorpe & G. Brown Field Descr. Igneous Rocks ix. 125 Around the vents are alkali-enriched metasomatic rocks containing alkali feldspar and alkali pyroxenes replacing the original mineralogy.
1993 Jrnl. Petrol. 34 1023 If the basalts of the Gregory rift were produced from metasomatized lithosphere then the metasomatic process must have affected most of the lithosphere.
2. Zoology. Of or relating to a metasoma; metasomal. rare.
ΚΠ
1890 Cent. Dict. Metasomatic, of or pertaining to the metasome of a cephalopod.
1893 A. E. Shipley Zool. Invertebr. 398 Extends into the narrow metasomatic segments.
1954 Systematic Zool. 3 184/1 Its tentacular region attains a length of about 20 mm., its mesasomatic [sic] about 80 mm., and its metasomatic 40 mm.
1993 Indian Jrnl. Exper. Biol. 31 231 Cobalt fillings of single identified long hair sensillum on 5th metasomatic segment [of a scorpion] show that sensory axons enter the 7th ganglion.
Derivatives
metasoˈmatically adv. Geology by means of metasomatism.
ΘΚΠ
the world > the earth > structure of the earth > formation of features > metamorphism > [adverb] > metasomatism
metasomatically1921
1921 Geol. Mag. 58 553 The great eastern mass of rauhaugite is metasomatically derived from sövite.
1965 Amer. Mineralogist 50 1485 Hibschite or hydrogrossular..has long been known from..metasomatically altered anorthosites and pyroxenites.
1999 Jrnl. Geol. (Chicago) 107 416/2 The mineralogy, chemistry, and isotope composition of camptonites indicate they derived from a metasomatically enriched mantle source with a negligible crust component.
This entry has been updated (OED Third Edition, December 2001; most recently modified version published online March 2022).
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adj.1878