英语词汇“phenocryst”的音标、意思、用法及中文翻译-反思网

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词汇	phenocryst
释义	BETA Examples of phenocryst phenocryst isn’t in the Cambridge Dictionary yet. You can help! The proportions of the clinopyroxene existing as phenocryst versus groundmass phases are highly variable. Conversely, distinctive lithological sequence characteristics can be locally mapped, together with variations in phenocryst assemblages in associated ignimbrites. The basalts are generally porphyritic, and phenocryst assemblages show a gradual change from olivine to olivine-clinopyroxene-oxides and olivine-clinopyroxene-plagioclase. Most of the tuffs are also zoned with respect to phenocryst proportions: phenocryst-poor bases grade to tops with more phenocrysts (as much as 20 %). These show no evidence for relict vesicular texture and have a crystal (phenocryst) content comparable to that of the rock as a whole. Figure 6c shows a fine-grained albite-sericite aggregate, which appears to be pseudomorphous after a primary plagioclase phenocryst. Plagioclase is labradorite (phenocryst) and oligoclase (matrix) and has been variably sericitized. Clinopyroxene (30-40 vol. % of the rock) is also abundant both as a phenocryst and as a groundmass phase. Clinopyroxene is also abundant as a phenocryst phase, and is common in the groundmass. No olivine was identified in the groundmass or as a phenocryst phase. There is no obvious horizontal variation in the composition of the basalts; however, within-flow vertical variation, represented by change in phenocryst types and proportions, is recorded. Banded pumice occurs in most units of the third (youngest) explosive cycle, and ignimbrites typically contain mixed phenocryst assemblages, indicating the role of magma mixing/mingling prior to eruption. A phenocryst is a relatively large and usually conspicuous crystal distinctly larger than the grains of the rock groundmass of an igneous rock. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.
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Examples of phenocryst