| 词汇 | dolerite |
| 释义 | dolerite noun[ C or U ] uk /ˈdɒl.ə.raɪt/ us /ˈdɑːl.ə.raɪt/ a type of dark rock that comes from magma(= very hot liquid rock that has cooled): 辉绿岩，粗粒玄武岩 Jurassic dolerite is found in many parts of Tasmania.在塔斯马尼亚的许多地方都发现了侏罗纪辉绿岩。 The famous Stonehenge spotted dolerites come from the Preseli Hills in Wales.著名的巨石阵斑纹辉绿岩来自威尔士的普雷塞利山。 The dolerite cliffs of the cape were quite spectacular.海角的辉绿岩悬崖相当壮观。 Bluestones are bluish volcanic rocks of spotted dolerite found in West Wales. A precipitous dolerite crag forms the perfect defence on the two seaward sides of the castle. Cradle Mountain is composed of dolerite, an igneous rock. The peaks are resistant "spires" of Jurassic dolerite, lying over older rocks of Triassic-Permian sediments. Dr Gibb is a specialist in igneous rocks who has done mould-breaking research into the beautiful columnar dolerites of the Hebrides. Geology: types of rock agglomerate arenaceous arenite asthenosphere asthenospheric emery flinty gneiss intrusive lahar limestone lodestone magma marcasite marl marmoreal mudstone obsidian sandstone schist Examples of doleritedolerite These observations can be explained by the fact that felsic granulite requires more fluid infiltration to equilibrate than mafic granulite and dolerite. Subangular to subrounded fragments of basalt and dolerite of boulder to granule sizes are contained in a red granule matrix. Thin-section analysis of one rock sample identified it as a dolerite. The basalt and dolerite groups are geochemically indistinguishable and may be treated as a single sample set. The breccias consist mainly of bottle-green basalt and dolerite rubble mixed with subordinate amounts of reddish, finegrained matrix. Dolerite is relatively poor in silicon and rich in minerals, and after chemical weathering doleritic soils have high clay contents. Despite the high temperatures of the igneous intrusion, carbon has been preserved at the dolerite-shale contact and in shale enclaves where partial melting of the shale has occurred. Although they appear to be of abiogenic origin, only that near the dolerite sills points to a probable mantle origin. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The lighthouse was built by convict labour using locally-quarried dolerite over two years. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The dolerite is believed to have existed as much as 1/2 billion years before the meteorite impact. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The pebbles are mostly quartzite, but include dolerite and agate. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Dolerite is intrusive and is relative to basalt (extrusive). From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The peak is sandstone with dolerite intrusions and is a sharp summit ridge. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Sediments are up to 500 meters thick, with the lowest layers consisting of dolerite boulders. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Dolerite is composed of an intrusive volcanic rock of plagioclase feldspar that is harder than granite. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. 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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