| 释义 |
overˈsaturated, ppl. a.
[over- 24 b.]
Super-saturated; chiefly in Petrol., applied to a rock or magma in which there is free silica (or some other specified oxide). Hence ˌoversatuˈration, the property of being oversaturated.
1913S. J. Shand in Geol. Mag. Decade V. X. 510 Any rock which contains free quartz or tridymite of magmatic origin will be termed oversaturated. Ibid. 513 The connexion between mineral and chemical composition need not be obscured thereby, but rather the reverse, especially if..the relative degrees of oversaturation or undersaturation were introduced..in the classification. 1946Nature 19 Oct. 549/1 We would rather expect such condensations to show no more rotation than the water droplets in a fog formed from oversaturated vapour. 1947E. E. Wahlstrom Igneous Minerals & Rocks ix. 253 Rocks may be oversaturated, saturated, or undersaturated with respect to alumina or other oxides as well as with respect to silica. Ibid., Free silica, which indicates oversaturation, is not present in rocks containing undersaturated minerals such as leucite and nephelite. 1974A. D. Edgar in H. Sørensen Alkaline Rocks v. i. 357/1 The genesis of oversaturated alkaline rocks. 1974W. C. Luth in Ibid. vi. vi. 506/2 Since the liquid is always silica oversaturated the crystalline assemblage must be silica undersaturated when a liquid is present. |