词汇 | leucocratic |
释义 | BETA Examples of leucocraticleucocratic isn’t in the Cambridge Dictionary yet. You can help! The mineral fabric cuts and deforms leucocratic melt patches, suggesting that partial melting in the garnetiferous felsic gneiss occurred before or coeval with granulite-facies metamorphism. However, because of the strongly leucocratic nature of both domains, and the subsequent ductile deformation, the migmatitic structure is not very conspicuous. Gradual transitions can locally be seen, reflecting mixing of the mafic and the leucocratic components. Cummingtonite, commonly coexisting with green hornblende, is common in the more leucocratic amphibolites (up to c. 50 % quartz and feldspar). The leucocratic gneiss is commonly garnet + sillimanite + cordierite bearing, and massive to weakly foliated. In many cases, this has obviously led to a disintegration of the 'pillows' and formation of variably angular fragments, which display both chilled and non-chilled margins to the leucocratic host. The most widespread types of rock are leucocratic gneisses rich in quartz. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The older stock consists of fine-grained biotite hornblende granodiorite while the younger stock comprises leucocratic biotite quartz monzonite. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The gneiss is leucocratic, with only minor amounts of biotite and muscovite. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The composition is highly variable, but for the most part is composed of fine to medium grained leucocratic monzonite. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The leucocratic facies can be regarded as a strongly sheared leucogranite that is very rich in muscovite. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. |
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