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isochemical
isochemical adj. 
/ˌaɪsəˈkɛmək(ə)l/ Geology taking place with or characterized by constant chemical composition.
Brit. /ˌʌɪsə(ʊ)ˈkɛmᵻkl/
, /ˌʌɪsə(ʊ)ˈkɛmᵻkl/U.S. /ˌaɪsoʊˈkɛmək(ə)l/
, /ˌaɪsoʊˈkɛmək(ə)l//ˌaɪsəˈkɛmək(ə)l/ΘΚΠ
the world > the earth > structure of the earth > constituent materials > rock > mineral or chemical composition > [adjective] > chemical composition
isochemical1937
1937 Trans. Royal Soc. Edinb. 59 218 Correlation between rocks of the same bulk-composition metamorphosed under different physical controls—i.e. isochemical correlation.
1951 F. J. Turner & J. Verhoogen Igneous & Metamorphic Petrol. xv. 369 Metamorphism may be considered as commonly approaching, though seldom attaining, the nature of an isochemical change.
1952 T. F. W. Barth Theoret. Petrol. iv. xii. 356 In geological discussions the fact that sediments at the very incipience of metamorphism regularly change their chemical composition has often been neglected. However, these changes are not to be neglected... Isochemical regional metamorphism senso strictu [sic]..does not exist.
1969 W. D. Johns tr. Correns Introd. Mineral. ix. 298 Transformations in an isochemical system depend on the temperature and pressure to which the system has been subjected.
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