amphibolitization, n. Petrogr.
(æmˌfɪbəlɪtaɪˈzeɪʃən)
[f. amphibolite n. + -ization.]
The alteration of a rock to form amphibolite, or one more nearly resembling amphibolite in composition.
| 1918 Q. Jrnl. Geol. Soc. LXXIV. 61 W. G. Foye correlates the liberation of alkaline solutions by amphibolitization with the production of nepheline-syenites. 1932 A. Harker Metamorphism xviii. 308 True eclogites..may be seen in all stages of amphibolization. Amphibolitization is perhaps a more appropriate description; for it is often not a mere replacement of pyroxene by amphibole but a reaction between garnet and pyroxene, yielding an aggregate of hornblende and plagioclase. 1974 Scottish Jrnl. Geol. X. 42 Amphibolitization of a granulite-facies terrain involves hydration of essentially anhydrous mineral assemblages. |
Hence (as back-formations) amˈphibolitize v. trans., to increase the amphibolic content of (a rock); amˈphibolitized ppl. a.
| 1961 Webster, Amphibolitize, v.t. 1963 Jrnl. Petrol. IV. 356 Sr and An values in plagioclases present in rocks of all stages from fresh to amphibolitized gabbros..are similar. 1974 Nature 4 Oct. 382/1 Paucity of fluids may also explain why large areas of Archaean granulites were not amphibolitized in later times. 1985 Chem. Geol. L. 65/2 These rocks have been referred to as ‘symplectitic eclogites’, ‘amphibolitized eclogites’, ‘retrograded eclogites’, ‘eclogitic amphibolites’ or even ‘clinopyroxene–garnet rocks’ by previous investigators. 1993 Jrnl. Geol. Cl. 358 A..low-K, calcic amphibolite, collected from an amphibolitized mafic dike. |