metavolcanic, n. and a. Petrogr. (Formerly at meta- 5 b.)
(mɛtəvɒlˈkænɪk)
[f. meta- 5 b + volcanic a. (and n.).]
A. n. A volcanic rock which has been subjected to metamorphism. B. adj. Designating such rock.
| 1942 M. P. Billings Struct. Geol. xii. 215 Metasediments, metavolcanics, and meta-igneous rocks are metamorphic rocks derived, respectively, from sedimentary, volcanic, and igneous rocks. 1962 Mineral. Abstr. XV. 381/1 The granite gneisses, amphibolites, and metavolcanics of the southern Klodzko metamorphic zone are described. 1964 Ibid. XVI. 657/2 Thirteen planimetric and 22 chemical analyses elucidate the composition of the conglomerates, graywacke schists, mica schists, and basic metavolcanic rocks. 1971 Bull. Volcanologique XXXIV. 778 Nearly all workers concerned with the stratified rocks have acknowledged that there are probably some metavolcanic rocks in the predominantly metasedimentary formations. 1979 Canad. Mineralogist XVII. 198/1 Field relationships suggest that the metavolcanic and metasedimentary rocks may be coeval. 1989 Jrnl. Petrol. XXX. 178 The igneous component is represented by amphibolites and intercalated felsic meta-volcanics. |