granodiorite

granodiorite
Medium-to coarse-grained rock that is one of the most abundant intrusive rocks.

It contains quartz and is distinguished from granite by having more plagioclase feldspar than orthoclase feldspar; its other mineral constituents include hornblende, biotite, and augite. Granodiorite is similar to granite in appearance but darker.

* * *

▪ rock
      medium- to coarse-grained rock that is among the most abundant intrusive igneous rocks. It contains quartz and is distinguished from granite by its having more plagioclase feldspar than orthoclase feldspar; its other mineral constituents include hornblende, biotite, and augite. The plagioclase (andesine) usually forms twinned crystals, sometimes wholly encased by orthoclase. The mode of formation and occurrence, physical appearance, and mineralic composition and texture of granodiorite are much like those of granite (q.v.); granodiorite is darker in colour, however, because of its greater plagioclase content.

* * *


Universalium. 2010.

Игры ⚽ Нужен реферат?

Look at other dictionaries:

  • Granodiorite — (pronEng|ˌgrænəˈdaɪəraɪt/, /ˌgreɪn ) is an intrusive igneous rock similar to granite, but contains more plagioclase than potassium feldspar. It usually contains abundant biotite mica and hornblende, giving it a darker appearance than true granite …   Wikipedia

  • Granodiorite — Granodiorite. La granodiorite (de « grain » et de « diorite ») est une roche magmatique plutonique grenue proche du granite. Elle est principalement constituée de quartz (> 10 %) et de feldspaths, mais contrairement au …   Wikipédia en Français

  • granodiorite — ● granodiorite nom féminin Roche plutonique proche des granites, constituée de quartz, plagioclase et feldspath potassique, biotite et amphibole …   Encyclopédie Universelle

  • granodiorite — noun Date: 1893 a granular intrusive quartzose igneous rock intermediate between granite and quartz containing diorite with plagioclase predominant over orthoclase • granodioritic adjective …   New Collegiate Dictionary

  • granodiorite — noun an intrusive igneous rock similar to granite, but contains more plagioclase than potassium feldspar …   Wiktionary

  • granodiorite — n. variety of coarse grained igneous rock with characteristics of both granite and diorite (Geology) …   English contemporary dictionary

  • granodiorite — [ˌgranə(ʊ) dʌɪərʌɪt] noun Geology a coarse grained plutonic rock between granite and diorite in composition …   English new terms dictionary

  • granodiorite — grano·diorite …   English syllables

  • granodiorite — |gra(ˌ)nō+ noun Etymology: International Scientific Vocabulary grano + diorite : a granular intrusive quartzose igneous rock intermediate between granite and quartz diorite with plagioclase predominant over orthoclase …   Useful english dictionary

  • Tonalite-Trondhjemite-Granodiorite — Tonalite–trondhjemite–granodiorite (TTG) series are an aggregation of rocks that are formed by melting of hydrous mafic crust at high pressure. It is widely accepted that most Archaean granite–greenstones are dominated by TTG, although Late… …   Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”