polymicticadj.

Brit.

/ˌpɒlɪˈmɪktɪk/, U.S.

/ˌpɑliˈmɪktɪk/

Origin: A borrowing from Greek, combined with English elements. Etymons: poly- comb. form, Greek μικτός , -ic suffix.

Etymology: < poly- comb. form + ancient Greek μικτός mixed (see mictic adj.) + -ic suffix. In sense 1 after Russian polimiktovyj ( M. S. Švecov Petrografija osadočnyx porod (1934) viii. 155). With sense 2 compare amictic adj. 2. Compare oligomictic adj.

1. Geology. Of a sedimentary rock: composed of several minerals or rock types; (of a breccia) containing fragments of differing composition; (of a gravel) containing stones of greatly differing sizes.

ΘΚΠ

the world > the earth > structure of the earth > constituent materials > rock > mineral or chemical composition > [adjective] > containing one or more mineral

polysomatic1888

polymetallic1892

monomineral1911

monomineralic1911

oligomictic1935

polymict1935

polymictic1935

polymineral1938

1935 Jrnl. Sedimentary Petrology 5 106/2 Rocks consisting of one to two dominant minerals are termed oligomictic and those composed of several minerals polymictic... The book is written in Russian... The review is based on a typewritten summary in English.

1949 F. J. Pettijohn Sedimentary Rocks xiv. 438 Schwetzoff..noted that oligomictic rocks are the characteristic deposits of epicontinental seas and are found rarely in geosynclinal depressions, whereas polymictic rocks are characteristic of geosynclinal regions.

1959 W. 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.

1969 S. H. Haughton Geol. Hist. Southern Afr. iv. 89 At various horizons above the Intermediate Reefs bands of polymictic conglomerates occur.

1987 Nature 18 June 612/2 At 653m below the sea floor a sequence of marine Cenozoic sediments overlies the second unit with a sharp contact, represented by 552m of polymictic breccia that includes two horizons of partial and recrystallized melts.

1999 Geografiska Annaler A. 81 200 (caption) Unit A is gravelly sand to sandy gravel, with well-rounded components, a polymictic gravel fraction, and abundant volcaniclastic sediment.

2. Limnology. Of a lake: having no stable thermal stratification but exhibiting perennial circulation.

ΘΚΠ

the world > the earth > water > lake > [adjective] > stratification according to temperature

stratified1835

hypolimnetic1928

hypolimnial1940

metalimnetic1941

oligomictic1956

polymictic1956

metalimnic1972

1956 G. E. Hutchinson & H. Löffler in Proc. National Acad. Sci. U.S.A. 42 84 The lack of seasonal variation, that permits almost perennial stratification at low altitudes in equatorial latitudes, thus permits perennial circulation at high altitudes in the same latitudes. We propose for these two types of equatorial lake the terms oligomictic and polymictic, respectively.

1991 R. S. K. Barnes & K. H. Mann Fund. Aquatic Ecol. (ed. 2) v. 91/2 Shallower lakes may stratify and then destratify several times in a summer, as a result of windy periods. Such polymictic lakes are also common in the tropics.

2000 Limnol. & Oceanogr. 45 1058 In a shallow and polymictic lake, marked changes in the dynamics of phytoplankton and in the timing of distinctive successional events in spring were observed.

This entry has been updated (OED Third Edition, September 2006; most recently modified version published online March 2022).

单词	polymictic
释义	polymicticadj. Brit. /ˌpɒlɪˈmɪktɪk/, U.S. /ˌpɑliˈmɪktɪk/ Origin: A borrowing from Greek, combined with English elements. Etymons: poly- comb. form, Greek μικτός , -ic suffix. Etymology: < poly- comb. form + ancient Greek μικτός mixed (see mictic adj.) + -ic suffix. In sense 1 after Russian polimiktovyj ( M. S. Švecov Petrografija osadočnyx porod (1934) viii. 155). With sense 2 compare amictic adj. 2. Compare oligomictic adj. 1. Geology. Of a sedimentary rock: composed of several minerals or rock types; (of a breccia) containing fragments of differing composition; (of a gravel) containing stones of greatly differing sizes. ΘΚΠ the world > the earth > structure of the earth > constituent materials > rock > mineral or chemical composition > [adjective] > containing one or more mineral polysomatic1888 polymetallic1892 monomineral1911 monomineralic1911 oligomictic1935 polymict1935 polymictic1935 polymineral1938 1935 Jrnl. Sedimentary Petrology 5 106/2 Rocks consisting of one to two dominant minerals are termed oligomictic and those composed of several minerals polymictic... The book is written in Russian... The review is based on a typewritten summary in English. 1949 F. J. Pettijohn Sedimentary Rocks xiv. 438 Schwetzoff..noted that oligomictic rocks are the characteristic deposits of epicontinental seas and are found rarely in geosynclinal depressions, whereas polymictic rocks are characteristic of geosynclinal regions. 1959 W. 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. 1969 S. H. Haughton Geol. Hist. Southern Afr. iv. 89 At various horizons above the Intermediate Reefs bands of polymictic conglomerates occur. 1987 Nature 18 June 612/2 At 653m below the sea floor a sequence of marine Cenozoic sediments overlies the second unit with a sharp contact, represented by 552m of polymictic breccia that includes two horizons of partial and recrystallized melts. 1999 Geografiska Annaler A. 81 200 (caption) Unit A is gravelly sand to sandy gravel, with well-rounded components, a polymictic gravel fraction, and abundant volcaniclastic sediment. 2. Limnology. Of a lake: having no stable thermal stratification but exhibiting perennial circulation. ΘΚΠ the world > the earth > water > lake > [adjective] > stratification according to temperature stratified1835 hypolimnetic1928 hypolimnial1940 metalimnetic1941 oligomictic1956 polymictic1956 metalimnic1972 1956 G. E. Hutchinson & H. Löffler in Proc. National Acad. Sci. U.S.A. 42 84 The lack of seasonal variation, that permits almost perennial stratification at low altitudes in equatorial latitudes, thus permits perennial circulation at high altitudes in the same latitudes. We propose for these two types of equatorial lake the terms oligomictic and polymictic, respectively. 1991 R. S. K. Barnes & K. H. Mann Fund. Aquatic Ecol. (ed. 2) v. 91/2 Shallower lakes may stratify and then destratify several times in a summer, as a result of windy periods. Such polymictic lakes are also common in the tropics. 2000 Limnol. & Oceanogr. 45 1058 In a shallow and polymictic lake, marked changes in the dynamics of phytoplankton and in the timing of distinctive successional events in spring were observed. This entry has been updated (OED Third Edition, September 2006; most recently modified version published online March 2022). < adj.1935
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