autometamorphismn.
/ˌɔːtə(ʊ)ˌmɛtəˈmɔːfɪz(ə)m/, U.S. /ˌɔdoʊˌmɛdəˈmɔrˌfɪz(ə)m/, /ˌɔdəˌmɛdəˈmɔrˌfɪz(ə)m/, /ˌɑdoʊˌmɛdəˈmɔrˌfɪz(ə)m/, /ˌɑdəˌmɛdəˈmɔrˌfɪz(ə)m/ΚΠ
1863 J. J. Sylvester in London, Edinb., & Dublin Philos. Mag. 4th Ser. 26 172 Some of my readers may remember a signal case of a similar autometamorphism which occurred to myself in an algebraical inquiry, in which I was enabled to construct the canonical form of a six-degreed binary quantic from an analogy based on the same for a four-degreed one.
2. Geology. Metamorphism of an igneous rock caused by the action of volatile constituents of the rock itself, under conditions of falling temperature. Cf. deuteric adj.
ΚΠ
1917 H. C. Sargent in Nature 15 Mar. 59/2 It is suggested that the intense decomposition of the spilites is a case of autometamorphism, due to retention of volatile constituents resulting from the physical environment of a submarine flow.
1940 F. F. Grout Kemp's Handbk. Rocks (ed. 6) ii. 38 Where these magmatic changes in minerals and structures are conspicuous, some petrographers refer to them as autometamorphism.
1993 D. E. Wilhelms To Rocky Moon xiv. 257 Autometamorphism, incorporation of diverse target rocks,..and incorporation of local material have all occurred on the Moon.
This is a new entry (OED Third Edition, June 2011; most recently modified version published online December 2021).
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