| 词汇 | basalt |
| 释义 | basalt noun[ U ] uk /ˈbæs.ɒlt/ us /ˈbæs.ɑːlt/ a type of black rock that comes from a volcano玄武岩 KrimKate/iStock/Getty Images Plus/GettyImages Geology: types of rock agglomerate arenaceous arenite asthenosphere asthenospheric emery flinty gneiss haematite indurated intrusive lahar limestone lodestone magma marl marmoreal obsidian sandstone schist It was built upon a conical peak of basalt, and was surrounded by four deep valleys, one on each side, another in front, and the fourth in the rear. The hills which bound the valley of the creek are basalt, sandstone, and schist. The right bank of the river rose into steep cliffs of basalt, under which the clustered fig tree, with its dense foliage, formed a fine shady bower. The soil is chiefly volcanic ash, disintegrated basalt and alluvium. The spot was quite surrounded by high sloping walls of basalt, except to the west, where they opened in a three-foot cleft to the shore, and the ground was strewn with slabs and boulders of granite and basalt. basalt | American Dictionarybasalt noun[ U ] us/bəˈsɔlt, ˈbeɪ·sɔlt/ earth science a type of black rock that comes from a volcano (= mountain that explodes and throws out hot rocks) Examples of basaltbasalt This lends support to a controlling influence for lithospheric rifting zones on continental flood basalt generation and emplacement. We have undertaken three independent field tests to determine whether the magnetization of the andesite and basalt sheets is primary. These conglomerates are composed of clasts of basalt, volcaniclastic sandstone, alkaline lava and sub-rounded chert. From about 128 km away, they hauled huge basalt boulders, from which to carve colossal heads, and nearly 100 other sculptures. This is corroborated by the rather similar isotopic compositions of the alkali basalts and trachytes. The combined effects of less erosion-resistant marly limestone and the columnar jointing of basalts caused the rapid migration of the knickpoint toward the upstream reach. Soils are coarse inceptisols originating from 2-3 m of volcanic ash over basalt bedrock. Mineral beads were added in order to reveal a possible influence of basalt and limonite on the molecular stability and formation of the derivatives. The basalts have distinctive petrographic characteristics such as rounded and skeletal olivine phenocrysts with abundant melt inclusions, implying the mixing of two distinct magmas. The rapid incision can be attributed to the adequacy of discharge under the prevailing warm and humid climate conditions after basalt extrusion. The levels of elephant utilization and tree pushing were also determined for the four main geological substrates, basalt, granite, rhyolite and gabbros. The breccia contains a variety of boulders, dominated by vesicular basalt and phonolitic lavas. Unweathered basalt minerals such as olivine and pyroxene contain high amounts of reduced iron that microbes can scavenge. These two tuffs could have had the same parental magmas than the other tuffs and associated basalts. Plucking may effectively erode the welljointed thick basalt bed, resulting in boulders the size of which depends on the bedding and joints of the basalts. 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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