| 释义 |
phacoidal, a. Petrogr.|fəˈkɔɪdəl|
[f. as phacoid a. + -al1.]
a. Lens-shaped, lenticular.
b. Characterized by the presence of lenticular inclusions.
1901Rep. Brit. Assoc. Adv. Sci. 617 The basic dykes..appear frequently as phacoidal masses amid the reconstructed gneiss. 1920[see eye n.1 12 f]. 1956E. W. Heinrich Microsc. Petrogr. vii. 185 In phacoidal rocks the characteristic textural feature consists of ellipsoidal or lensoid units in a finer-grained matrix that is brecciated and sheared. Ibid. 186 Some mechanically metamorphosed conglomerates also possess the phacoidal texture. 1959W. W. Moorhouse Study of Rocks in Thin Section xxviii. 463 Granites, syenites, and granodiorites show some foliation and a lenticular, ‘phacoidal’ form of quartz and feldspar grains. |