| 词汇 | shale |
| 释义 | shale noun[ U ] uk /ʃeɪl/ us /ʃeɪl/ a type of soft, grey rock, usually formed from clay that has become hard, that breaks easily into thin layers页岩 Douglas Sacha/Moment/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 shale | American Dictionaryshale noun[ U ] us/ʃeɪl/ earth science a type of rock consisting of solid material that has been pressed into thin layers Examples of shaleshale About 50 specimens, mostly proximal ends, preserved in partial relief on two small pieces of shale. Reefs have been exhumed by erosion of overlying shales. Fragments of shale and chert are indicative of parent material of lower regional metamorphism than the gneissic fragments. Subsequent abrupt deepening led to deposition of a thick black shale unit, turbidite deposits and large-scale submarine channel-fill deposits. Bioturbation is abundant in the shale as both horizontal and vertical exichnial traces. In analogy with impact heating, the target (in this case the shale) was not progressively heated but heated relatively rapidly. The stippled bands represent the lower and upper black shales. Most likely the organic matter is derived from the carbon- and uranium-rich bituminous shale of the target. Thus, during preparation the shale projectiles used were worked into near spherical shape. The necromass concentrations of all nutrients on sandstone were lower than on shale. The lower member (max. c. 600 m) is composed mainly of thick clay shales interbedded with thin sandy limestone beds (packstones and wackestones). Many of the black shales exhibit few features optically due to their fine grain size. The latter was described as "massive sandstones and conglomerates with interbedded sandy shales which are of continental origin". The abundance of shales in the central lake deposits shows a low-energy depositional setting. 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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