from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An igneous rock composed chiefly of plagioclase and orthoclase, with small amounts of other minerals.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An intrusive igneous rock composed mostly of plagioclase and orthoclase
from The Century Dictionary and Cyclopedia
- n. In petrography, a phaneric igneous rock intermediate in composition between syenite and diorite, that is, composed of alkali feldspar, usually orthoclase, and lime-soda feldspar, andesin or labradorite, in equal or nearly equal proportions, with subordinate amounts of hornblende, pyroxene, or mica, rarely olivin, and minor constituents. There may be a variable amount of quartz: when it is present in considerable amount the rock is quartz-monzonite or granodiorite.
Mount Warning itself represents the original neck of the volcano which, being more resistant (comprising syenite, gabbro and monzonite) than the surrounding basalt and rhyolite, remains as an isolated plug.
The granitic rock the tuff is lying on is a Jurassic quartz monzonite, 157 Ma, which hosts the silver veins of the Austin or Reese River mining district.
In the Tintic district of central Utah, Paleozoic limestones have been intruded by monzonite (an acid granitic or porphyritic igneous rock), and covered by surface flows, the flows for the most part having been removed by subsequent erosion.
According to Tinka Resources Ltd., press release dated January 24, 2007, mapping and prospecting has outlined a 1,000 by 800 metre area hosted by granodiorite and quartz monzonite of the Coastal Batholith which intruded Jurassic and Cretaceous sediments and volcanic.
Mapping and prospecting on the property has outlined a 1,000 by 800 metre area hosted by granodiorite and quartz monzonite of the Coastal Batholith which intruded Jurassic and Cretaceous sediments and volcanic.
Eagle Zone at Dublin Gulch (67Mt @ 0. 92gpt indicated + 14Mt @ 0. 8gpt inferred) - all low grade bulk tonnage deposits consisting of sheeted veins or porphyries above shallowly emplaced plutons (monzonite).
Silver mineralization is hosted in breccia and stockwork zones that occur primarily in the andesitic volcanic and intrusive rocks and to a lesser extent in quartz monzonite porphyry intrusive rocks.
The Jurassic age Cu-Ag-Pt-Pd mineralization at the Sappho area is associated with semi-massive to massive sulphide veins, blebs, pods and disseminations consisting of chalcopyrite-pyrite-magnetite hosted by pyroxenite, monzonite and syenite intrusions.
The Buccaneer Porphyry is a porphyrytic monzonite intrusion (an alkali intrusive rock commonly associated with bulk-tonnage intrusive related gold deposits around the world) that has been mapped using multi-element geochemistry over an area approximately 3 kilometres by 1.5 kilometres.
Historically, the majority of the Copper Flat resource was hosted by an extensive breccia pipe and surrounding host rock of porphyritic quartz monzonite.
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