| 释义 |
oolith Petrol.|ˈəʊəlɪθ|
[f. Gr. ᾠόν egg + λίθος stone (see -lith).
Mod.L. oolithus occurs in this sense in 1721 (F. E. Brückmann Specimen Physicum Exhibens Historiam Naturalem Oolithi seu Ovariorum Piscium et Concharum in Saxa Mutatorum 5) and may be the source of both this word and oolite (= ad. F. oölithe).]
Each of the small rounded granules of which oolite is composed.
1788J. H. De Magellan A. F. Cronstedt's Ess. Syst. Mineral. (ed. 2 rev.) I. 76 The Stalagmites..get a mammillary form, whilst the Stalactites acquire a conic figure: the Oolithes and Pisolites belong to the same species. 1892Jrnl. R. Microsc. Soc. 839 These ooliths are undoubtedly the product of a lime-separating Schizophyte; and the author believes this to be the case with the greater number of the marine calcareous ooliths with a regular zoned and radial structure. 1926G. W. Tyrrell Princ. Petrol. xiii. 227 The grains are called ooliths and the rock containing them oolite or oolitic limestone. Ooliths generally show a series of concentric coats of calcareous material in which a radiating crystalline structure can often be made out. 1938M. Black Hatch & Rastall's Petrol. Sedimentary Rocks (ed. 3) viii. 175 A normal oolite is made up of an aggregate of spherical bodies, called ooliths, usually about 1 mm. or less in diameter, cemented by some interstitial material, usually calcite. 1971I. G. Gass et al. Understanding Earth i. 31/2 Ooliths are formed in environments where calcite is being precipitated and there is strong and continuous wave action. |