melanocraticadj.

Brit.

/ˌmɛlənə(ʊ)ˈkratɪk/, U.S.

/ˌmɛlənoʊˈkrædɪk/,

/ˌmɛlənəˈkrædɪk/

Origin: A borrowing from German, combined with an English element. Etymons: German melanokrat , -ic suffix.

Etymology: < German melanokrat, adjective (W. C. Brögger Eruptivgesteine des Kristianiagebietes (1898) iii. 263; < melano- melano- comb. form + ancient Greek κρατεῖν to rule, prevail; compare -cratic comb. form) + -ic suffix. Compare leucocratic adj. at leuco- comb. form 1.

Geology.

Of a rock: dark-coloured, rich in dark-coloured minerals.

ΘΚΠ

the world > the earth > structure of the earth > constituent materials > rock > texture or colour > [adjective] > colour

melanocratic1901

mesocratic1901

leucocratic1909

1901 Jrnl. Geol. (Chicago) 9 620 The composition is much the same in a general way as that of the ijolite, only that it is melanocratic, rather than mesocratic.

1954 H. Williams et al. Petrogr. ii. 33 Shard also distinguishes four classes, but with different limits, as follows: leucocratic rocks, with less than 30 percent mafic minerals; mesocratic rocks, with 30–60 percent; melanocratic rocks, with 60–90 percent; and hypermelanic rocks, with more than 90 percent mafic minerals.

1985 R. Thorpe & G. Brown Field Descr. Igneous Rocks i. 1 In terms of mineral composition, they range from dark-coloured, or melanocratic rocks rich in ferromagnesian minerals (e.g. olivine and pyroxenes), through mesocratic rocks to..leucocratic rocks.

This entry has been updated (OED Third Edition, June 2001; most recently modified version published online March 2022).

单词	melanocratic
释义	melanocraticadj. Brit. /ˌmɛlənə(ʊ)ˈkratɪk/, U.S. /ˌmɛlənoʊˈkrædɪk/, /ˌmɛlənəˈkrædɪk/ Origin: A borrowing from German, combined with an English element. Etymons: German melanokrat , -ic suffix. Etymology: < German melanokrat, adjective (W. C. Brögger Eruptivgesteine des Kristianiagebietes (1898) iii. 263; < melano- melano- comb. form + ancient Greek κρατεῖν to rule, prevail; compare -cratic comb. form) + -ic suffix. Compare leucocratic adj. at leuco- comb. form 1. Geology. Of a rock: dark-coloured, rich in dark-coloured minerals. ΘΚΠ the world > the earth > structure of the earth > constituent materials > rock > texture or colour > [adjective] > colour melanocratic1901 mesocratic1901 leucocratic1909 1901 Jrnl. Geol. (Chicago) 9 620 The composition is much the same in a general way as that of the ijolite, only that it is melanocratic, rather than mesocratic. 1954 H. Williams et al. Petrogr. ii. 33 Shard also distinguishes four classes, but with different limits, as follows: leucocratic rocks, with less than 30 percent mafic minerals; mesocratic rocks, with 30–60 percent; melanocratic rocks, with 60–90 percent; and hypermelanic rocks, with more than 90 percent mafic minerals. 1985 R. Thorpe & G. Brown Field Descr. Igneous Rocks i. 1 In terms of mineral composition, they range from dark-coloured, or melanocratic rocks rich in ferromagnesian minerals (e.g. olivine and pyroxenes), through mesocratic rocks to..leucocratic rocks. This entry has been updated (OED Third Edition, June 2001; most recently modified version published online March 2022). < adj.1901
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