oligomicticadj.

Brit.

/ˌɒlᵻɡə(ʊ)ˈmɪktɪk/, U.S.

/ˈˌɑləɡoʊˈmɪktɪk/,

/ˈˌoʊləɡoʊˈmɪktɪk/

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

Etymology: < oligo- comb. form + ancient Greek μικτός mixed (see mictic adj.) + -ic suffix. In sense 1 after Russian oligomiktovyj (M. S. Švecov Petrografija osadočnyx porod (1934) viii. 155). In sense 2 after holomictic adj. at holo- comb. form , meromictic adj. Compare polymictic adj.

1. Geology. Of a sedimentary rock: consisting of a small number of dominant minerals or rock types; (of a breccia) composed of fragments of a single kind of rock.

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 Petrol. 5 106/2 Rocks consisting of one to two dominant minerals are termed oligomictic and those composed of several minerals polymictic.

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.

1977 Proc. Trans. Royal Soc. A. 286 549 Fluid inclusions, preserved in quartz pebbles of the uraniferous and auriferous Precambrian oligomictic conglomerates of the Witwatersrand Basin, provide a unique insight into the genesis of the ores.

2002 Sedimentary Geol. 146 265 These conglomerates are largely comprised of oligomictic, rounded lime-mudstone clasts of various size and shape.

2. Limnology. Of a tropical lake: that exhibits a stable thermal stratification and only rarely undergoes an overturn.

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 Although at low altitudes in the humid tropics small temperature gradients can maintain stable stratifications, no stable stratification develops at the low temperatures of high altitudes... We propose for these two types of equatorial lake the terms oligomictic and polymictic, respectively.

1987 Jrnl. Trop. Ecol. 3 18 This lake must..be either warm monomictic..or oligomictic (irregular and incomplete circulations, sometimes at long intervals).

2001 Amazoniana 16 487 The lake is oligomictic and eutrophicated with a shallow epilimnion and a large anoxic hypolimnion.

This entry has been updated (OED Third Edition, March 2004; most recently modified version published online March 2022).

单词	oligomictic
释义	oligomicticadj. Brit. /ˌɒlᵻɡə(ʊ)ˈmɪktɪk/, U.S. /ˈˌɑləɡoʊˈmɪktɪk/, /ˈˌoʊləɡoʊˈmɪktɪk/ Origin: A borrowing from Greek, combined with English elements. Etymons: oligo- comb. form, Greek μικτός , -ic suffix. Etymology: < oligo- comb. form + ancient Greek μικτός mixed (see mictic adj.) + -ic suffix. In sense 1 after Russian oligomiktovyj (M. S. Švecov Petrografija osadočnyx porod (1934) viii. 155). In sense 2 after holomictic adj. at holo- comb. form , meromictic adj. Compare polymictic adj. 1. Geology. Of a sedimentary rock: consisting of a small number of dominant minerals or rock types; (of a breccia) composed of fragments of a single kind of rock. 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 Petrol. 5 106/2 Rocks consisting of one to two dominant minerals are termed oligomictic and those composed of several minerals polymictic. 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. 1977 Proc. Trans. Royal Soc. A. 286 549 Fluid inclusions, preserved in quartz pebbles of the uraniferous and auriferous Precambrian oligomictic conglomerates of the Witwatersrand Basin, provide a unique insight into the genesis of the ores. 2002 Sedimentary Geol. 146 265 These conglomerates are largely comprised of oligomictic, rounded lime-mudstone clasts of various size and shape. 2. Limnology. Of a tropical lake: that exhibits a stable thermal stratification and only rarely undergoes an overturn. 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 Although at low altitudes in the humid tropics small temperature gradients can maintain stable stratifications, no stable stratification develops at the low temperatures of high altitudes... We propose for these two types of equatorial lake the terms oligomictic and polymictic, respectively. 1987 Jrnl. Trop. Ecol. 3 18 This lake must..be either warm monomictic..or oligomictic (irregular and incomplete circulations, sometimes at long intervals). 2001 Amazoniana 16 487 The lake is oligomictic and eutrophicated with a shallow epilimnion and a large anoxic hypolimnion. This entry has been updated (OED Third Edition, March 2004; most recently modified version published online March 2022). < adj.1935
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