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Monzonite
Igneous rock
Monzonite.jpg
Monzonite specimen from Rock Library (NASA JPL)
Composition
Mostly plagioclase and alkali feldspar


Not to be confused with the rare earth-bearing phosphate mineral Monazite.
Photomicrograph of thin section of monzonite (in cross polarised light)
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 igneous intrusive rock. It is composed of approximately equal amounts of plagioclase and alkali feldspar, with less than 5% quartz by weight.[1] It may contain minor amounts of hornblende, biotite and other minerals. If quartz constitutes greater than 5%, the rock is termed a quartz monzonite.[2]

If the rock has a greater percentage of alkali feldspar, it grades into a syenite. With an increase in calcic plagioclase and mafic minerals the rock type becomes a diorite. The volcanic equivalent is the latite.[2]

Etymology[edit]

Monzonite was originally named after the Monzoni range in Val di Fassa (Trento Province - Italy) where it is abundant. As rock definitions have been systematized and codified, this association has lost any relevance to the rock's definition.[1]

See also[edit]

References[edit]

  1. ^ a b Le Maitre, R.W., Igneous Rocks: A Classification and Glossary of Terms Cambridge University Press, 2nd ed, pp. 113 ISBN 0-521-66215-X
  2. ^ a b Klein, Cornelis and Cornelius S. Hurlbut, Jr., Manual of Mineralogy, Wiley, 20th ed, pp. 480-484 ISBN 0-471-80580-7



Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Monzonite — Please support Wikipedia.
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201 news items

 
Stockhouse
Wed, 10 Feb 2016 18:26:15 -0800

Mineralization at La Cobota is hosted within a complex iron-oxide vein system that transects an equigranular to porphyritic quartz monzonite intrusion. The principal vein (Vein #1, Figure 2) targeted by drilling is heavily oxidized and composed of ...

Proactive Investors USA & Canada

Proactive Investors USA & Canada
Mon, 08 Feb 2016 06:03:45 -0800

Copper mineralization starting at a depth of 2,429.2 feet occurs in typical porphyry copper-style, potassically altered quartz monzonite with small amounts of molybdenite, the company told investors. The thickness of the mineralized intercept is ...
 
CNNMoney
Mon, 25 Jan 2016 06:26:15 -0800

The Mineral Mountain area is underlain by Precambrian rocks that include Pinal schist, diabase and granite that have been intruded by Laramide age quartz monzonite, granodiorite and hornblende dacite dikes. Laramide age intrusive rocks and their ...
 
Equities.com
Mon, 18 Jan 2016 06:03:45 -0800

The core of the property overlies a 12 km2 alteration zone centered on a cluster of porphyritic monzonite stocks hosted by volcanic and sedimentary rocks. Drilling campaigns from 1989 to 1991 targeted coincident Cu-Au soil geochemical anomalies and ...

ABN Newswire (press release)

ABN Newswire (press release)
Thu, 21 Jan 2016 16:00:00 -0800

"Drill hole NMRD443-746 ("F" on Figure 2 in link below) intersected a 285m mineralised zone from surface confirming that wide gold mineralisation continues to be discovered at depth within the hydrothermally altered volcaniclastics and monzonite ...
 
EMQ
Mon, 18 Jan 2016 05:07:30 -0800

The Company owns 80% interest in the Copler Gold Mine, which is an epithermal gold-silver-copper deposit, centered on a composite diorite to monzonite porphyry stock. The Company holds exploration licenses surrounding the Copler deposit cover a 15 ...
 
EMQ
Wed, 20 Jan 2016 23:52:30 -0800

The Company owns 80% interest in the Copler Gold Mine, which is an epithermal gold-silver-copper deposit, centered on a composite diorite to monzonite porphyry stock. The Company holds exploration licenses surrounding the Copler deposit cover a 15 ...
 
Zolmax
Wed, 27 Jan 2016 22:45:00 -0800

The Company owns 80% interest in the Copler Gold Mine, which is an epithermal gold-silver-copper deposit, centered on a composite diorite to monzonite porphyry stock. The Company holds exploration licenses surrounding the Copler deposit cover a 15 ...
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