| 词汇 | clastic |
| 释义 | clastic adjective geology specializeduk /ˈklæs.tɪk/ us /ˈklæs.tɪk/ used to refer to a type of rock consisting of broken pieces of other rock（岩石）碎屑的 Geology: types of rock agglomerate arenaceous arenite asthenosphere asthenospheric emery flinty gneiss intrusive lahar limestone lodestone magma marcasite marl marmoreal mudstone obsidian sandstone schist clastic | American Dictionaryclastic adjective[ not gradable ] us/ˈklæs·tɪk/ earth science describes a type of rock consisting of broken pieces of other rock Examples of clasticclastic The initial stage of sedimentation in these basins was characterized by terrestrial and shallow marine deposits that consist of both clastic and carbonate deposition. The resulting channel bars will have provided more extensive areas of clastic substrates, which will have favoured the fern-pteridosperm complex. The predominant fill-type is a clastic-textured, orange/brown biomicrite containing abundant comminuted brachiopod material. The system controlling the composition of clastic sediments. Extensional faulting created local accommodation space for the redeposition of material and focussed clastic supply routes into the basin at transfer zones. Stratigraphically diagnostic fossils are scarce or absent in many of these clastic sequences, which furthermore differ markedly in lithological succession between different outcrop areas. Clastic layers up to 10 cm thick are common within thick seams. This may partly be because the pteridosperms were probably growing on the levees and other raised areas in the forest with clastic substrates. Within fluvial systems, channel belts and floodplains (sites of deposition of both clastic and phytogenic material) environments coexisted. The intervening sediments record the collapse of the platform and deposition of clastic sediment derived from the advancing allochthon. Juvenile clasts of phonolite obsidian form 5 % of the clast content, but are distinguished by altered (hydrated) clast margins, and internal clastic texture. On the plus side, for example, there are comprehensive reviews of clastic and carbonate diagenesis, with useful sections on the controls on porosity and permeability. The frames arc covered by a specially developed clastic polyester fabric. Note that this is a mixed carbonate/clastic deposit and that the thicknesses of the basal sandstone and conglomerate vary along strike. 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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