| 单词 | gneiss |
| 释义 | gneiss noun[U] geologyspecializeduk/naɪs/us/naɪs/atypeofmetamorphicrockthatcontainslightanddarklayersformedofmineralssuch asquartzandmica 片麻岩（由长石﹑石英组成﹐中粗粒变晶结构和片麻状或条带状构造的变质岩） mikeuk/iStock/Getty Images Plus/GettyImages Geology: types of rock
Examplesofgneissgneiss Here we describe the colonization of heavily shockedgneissby heterotrophic bacteria in a natural setting. From theCambridge English Corpus The country rock was typically coarse crystalline granitegneiss, strongly weathered, ventifacted, and partly polished, and outcrops were 'crumbled' and without strength. From theCambridge English Corpus In weakly deformedgneiss, the mafic minerals (biotite, augite and hornblende) occur as irregular clusters, locally separated from plagioclase by coronas of garnet. From theCambridge English Corpus Samples from the normal smooth surface of thegneissboulder show that the surface has been ground and polished during glacial transportation. From theCambridge English Corpus These gneisses have been multiply deformed at granulite-facies conditions. From theCambridge English Corpus In general, eclogites are predominantly mafic and are preserved as boudins within felsic gneisses. From theCambridge English Corpus These pass up into a 150 m thick homogeneous granite that is bound by planar surfaces parallel to the foliation in the underlyinggneiss. From theCambridge English Corpus The kinematic evidence is interpreted to mean that the contact between thegneissand the biotite schist has a normal-shear (hangingwall down) geometry. From theCambridge English Corpus To the south, the meta-gabbro is bounded by felsicgneiss. From theCambridge English Corpus There is a continuum apparent between the amphibolites and intermediate gneisses, whilst the felsic gneisses form a separate, high-silica group. From theCambridge English Corpus However, few recognizable trends are apparent within the data clusters for the siliceous gneisses. From theCambridge English Corpus In thin-sections, the gneisses are cut by narrow pressure solution seams and narrow cataclastic shear zones. From theCambridge English Corpus These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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