单词 | xenocryst |
释义 | > as lemmasxenocryst xenocryst n. Brit. /ˈzɛnə(ʊ)krɪst/ , U.S. /ˈzɛnəˌkrɪst/ , /ˈzinəˌkrɪst/ Geology a crystal not derived from the magma that gave rise to the igneous rock containing it.ΘΚΠ the world > matter > chemistry > crystallography (general) > crystal (general) > crystal types > [noun] > specifically by method of crystallization xenocryst1894 metacryst1913 porphyroblast1920 1894 W. J. Sollas in Trans. Royal Irish Acad. 1896–1901 (1901) 30 493 As a distinctive appelation appropriate to the crystals, both of pyroxene and of plagioclase felspar, which have found their way from the gabbro into the granophyre, the term ‘xenocrysts’ may be employed. Correspondingly included fragments of the whole rock may be called ‘xenoliths’. 1964 G. A. Joplin Petrogr. Austral. Igneous Rocks ii. 26 Xenocrysts commonly show some resorption or corona indicating that they have reacted with the magma. 1983 Jrnl. Geol. (Chicago) 91 277 Xenocrysts and xenoliths from three Ithaca kimberlite localities are consistent with derivation from mantle depths of less than 150 km. < as lemmas |
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