| 释义 |
mugearite Petrogr.|ˈmʌgiːəraɪt|
[f. Mugear-y, the name of a village in the Isle of Skye, Scotland + -ite1.]
A dark, fine-grained trachyte which has oligoclase as the main feldspar and also contains olivine, orthoclase, and apatite.
1904A. Harker Tertiary Igneous Rocks Skye xv. 257 The other rock..is, when fresh, a black compact-looking rock without phenocrysts... As this rock..belongs to a peculiar type, we..give it a provisional name..‘mugearite’, a name adopted from that of Mugeary, the crofter village lying at a short distance north. 1928Trans. Geol. Soc. Glasgow XVIII. 348 A characteristic feature which the mugearites share with the Jedburgh basalts is the presence of close-set parallel somewhat irregular platy joints. 1956Trans. R. Soc. Edin. LXIII. 68 The mugearite lava east of Dunsapie Hill, thought to have been the first of the flows, contains a number of phenocrysts of albitised plagioclase. 1971Nature 23 Apr. 510/2 The lavas [of the Baringo District, Kenya] comprise a succession of alkali⁓olivine basalts, basanites and mugearites.
Hence mugeaˈritic a., of or containing mugearite.
1927Trans. R. Soc. Edin. LV. 504 We regard the mugearitic and essexitic intrusions of the Dalmahoy syncline as hypabyssal expressions of the magma which gave rise to the accompanying effusive mugearites and allied basalts. 1973Nature 9 Feb. 375/1 There, the volumes of individual hawaiitic and mugearitic lavas are frequently of the order of 0·1 km3. |