| 释义 |
polymictic, a.|pɒlɪˈmɪktɪk|
[f. as prec. + -ic.]
1. Petrol. [ad. Russ. polimiktovȳĭ (M. S. Shvetsov Petrografiya Osadochnȳkh Porod (1934) viii. 155).] (See quot. 1935.)
1935,1949[see oligomictic a. 1]. 1959W. W. Moorhouse Study of Rocks in Thin Section xix. 337 The polymictic conglomerate..comprises a great variety of pebbles, including granite, schist, sediments such as shale, slate, sandstone, and even limestone. 1969S. H. Haughton Geol. Hist. Southern Afr. iv. 89 At various horizons above the Intermediate Reefs bands of polymictic conglomerates occur.
2. Limnology. Applied to a lake that has no stable thermal stratification but exhibits perennial circulation.
1956[see oligomictic a. 2]. 1966McGraw-Hill Encycl. Sci. & Technol. V. 523/2 In addition there are..low-altitude tropical oligomictic lakes with irregular circulation, and high-altitude tropical polymictic lakes with continuous circulation. |