Definition, Meaning & Synonyms | English word MELANOCRATIC

Definitions of MELANOCRATIC

1. (geology, of igneous rock) Dark in color, containing at least 50-60% mafic minerals.

Examples of Using MELANOCRATIC in a Sentence

• Cumberlandite is a specific type of plutonic rock called a melanocratic troctolite, or melatroctolite.
• subordinate and comagmatic trondhjemite, diorite, gabbro, norite, and a dark-colored (melanocratic), hydrous, igneous rock termed hooibergite, or hornblende-rich mela-diorite.
• There are some cements such as the aluminous, derived from aluminous and lime materials, that are black (melanocratic).
• The bedrock around Nuuk consists of two major lithologic packages, the dark melanocratic Amitsoq gneiss, which is intruded by and complexly folded into the younger leucocratic Nuuk gneiss.
• Of the Tuolumne Intrusive Suite, it is the most melanocratic of the granodiorites containing many mafic microgranular enclaves.
• Rocks can be sorted into classes by several systems based on their color index, including into leucocratic and melanocratic rocks, or into (mineralogically) felsic and mafic rocks.

• a medium- to coarse-grained, meso- to melanocratic igneous rock, that stands out by conspicuous crystals of hornblende, which are enclosed by a matrix of plagioclase (oligoclase to andesine) and/or orthoclase.

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