| 单词 | radiolarian chert |
| 释义 | > as lemmasradiolarian chert radiolarian chert n. Geology a cryptocrystalline type of radiolarite; (more generally) = radiolarite n. ΘΚΠ the world > the earth > structure of the earth > constituent materials > rock > sedimentary rock > [noun] > other siliceous radiolarian chert1890 silcrete1902 radiolarite1910 1890 Geol. Mag. 7 144 (heading) Radiolarian chert in the Ballantrae series. 1913 F. H. Hatch & R. H. Rastall Petrol. Sedimentary Rocks ii. iii. 233 An interesting example of the metamorphism of a nearly pure siliceous rock is found in the Galloway district, where certain radiolarian cherts of Arenig age are altered by the Loch Doon granite. 1995 Jrnl. Royal Soc. N.Z. 25 99 Lava erupted on the outer shelf or upper slope provided a temporary barrier against terrigenous sedimentation, enabling radiolarian chert to be deposited on the seaward (protected) side. < as lemmas |
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