Monzonite

Photomicrograph of thin section of monzonite (in cross polarised light)

The QAPF diagram, by which a monzonite is defined

Photomicrograph of thin section of monzonite (in plane polarised light)

An intrusion (Notch Peak monzonite) inter-fingers (partly as a dike) with highly-metamorphosed host rock (Cambrian carbonate rocks). From near Notch Peak, House Range, Utah.

Monzonite is an intermediate igneous intrusive rock composed of approximately equal amounts of sodic to intermediate plagioclase and orthoclase feldspars with minor amounts of hornblende, biotite and other minerals. Quartz a minor constituent or is absent; with greater than 10% quartz the rock is termed a quartz monzonite.

If the rock has more orthoclase or potassium feldspar it grades into a syenite. With an increase of calcic plagioclase and mafic minerals the rock type becomes a diorite. The volcanic equivalent is the latite.

See also

• QAPF diagram

This article related to petrology is a stub. You can help Wikipedia by expanding it.v · Categories: Granitic rocks Petrology stubs Wikimedia Foundation. 2010. Игры ⚽ Нужна курсовая? Parramatta State School Backworth Look at other dictionaries: monzonite — ● monzonite nom féminin (de Monzoni, nom propre) Roche magmatique grenue contenant surtout des feldspaths (plagioclases et feldspaths potassiques), moins de 5 % de quartz, de la biotite et des amphiboles en quantité variable …   Encyclopédie Universelle monzonite — [män′zə nīt΄] n. [Ger monzonit, after Mt. Monzoni (in Tyrol), where it occurs] a dark colored, intrusive igneous rock containing orthoclase and plagioclase in nearly equal quantities, a small amount of quartz, and some biotite …   English World dictionary Monzonite — Monozonite (Larvikite) et une pièce pour donner l échelle Une monzonite est une roche magmatique plutonique à structure grenue composée d’orthose, de feldspath plagioclase, d’hornblende, d’augite et de biotite. La roche volcanique équivalente …   Wikipédia en Français monzonite — monzonitic /mon zeuh nit ik/, adj. /mon zeuh nuyt /, n. any of a group of granular igneous rocks having approximately equal amounts of orthoclase and plagioclase feldspar, intermediate in composition between syenite and diorite. [1880 85; < G… …   Universalium monzonite — noun Etymology: French, from Mt. Monzoni, Italy Date: 1895 a granular igneous rock composed of plagioclase and orthoclase in about equal quantities usually together with augite and biotite …   New Collegiate Dictionary monzonite — noun An intrusive igneous rock composed mostly of plagioclase and orthoclase …   Wiktionary monzonite — n. type of grainy igneous rock …   English contemporary dictionary monzonite — [ mɒnzənʌɪt] noun Geology a granular igneous rock containing approximately equal amounts of orthoclase and plagioclase. Origin C19: named after Mount Monzoni in the Tyrol, Italy, + ite1 …   English new terms dictionary monzonite — mon·zo·nite …   English syllables monzonite — /ˈmɒnzənaɪt/ (say monzuhnuyt) noun any of a group of granular igneous rocks intermediate in composition between syenite and diorite. {German Monzonit, from Monzoni (name of mountain in Tyrol) + it ite1} –monzonitic /mɒnzəˈnɪtɪk/ (say monzuh… …   18+ © Academic, 2000-2024 Contact us: Technical Support, Advertising Dictionaries export, created on PHP, Joomla, Drupal, WordPress, MODx. Mark and share Search through all dictionaries Translate… Search Internet Share the article and excerpts Direct link … Do a right-click on the link above and select “Copy Link”