Quartz monzonite bedrock from a USGS drill core at western Cape Cod, Massachusetts
Quarry for the Salt Lake Temple with boulders and detached masses being worked by stone cutters
Quartz monzonite is an intrusive, felsic, igneous rock that has an approximately equal proportion of orthoclase and plagioclase feldspars. It is typically a light colored phaneritic (coarse-grained) to porphyritic granitic rock. The plagioclase is typically intermediate to sodic in composition, andesine to oligoclase. Quartz is present in significant amounts. Biotite and/or hornblende constitute the dark minerals. Because of its coloring, it is often confused with granite, but whereas granite contains more than 20% quartz, quartz monzonite is only 5–20% quartz. Rock with less than five percent quartz is classified as monzonite. A rock with more alkali feldspar is a syenite whereas one with more plagioclase is a quartz diorite.[1] The fine grained volcanic rock equivalent of quartz monzonite is quartz latite.[1]
The term adamellite was originally applied by A. Cathrein in 1890 to orthoclase-bearing tonalite (likely a granodiorite) at Monte Adamello, Italy, in 1890, but later came to refer to quartz monzonite. The term is now deprecated.[2]
Quartz monzonite porphyry is often associated with copper mineralization in the porphyry copper ore deposits.[3]
^ abClassification of Igneous Rocks Archived September 30, 2011, at the Wayback Machine
^Streckeisen, A. (1 March 1976). "To each plutonic rock its proper name". Earth-Science Reviews. 12 (1): 1–33. doi:10.1016/0012-8252(76)90052-0.
^Titley, Spencer R. and Carol L. Hicks, Geology of the Porphyry Copper Deposits, University of Arizona Press, 1966, p. 35
Quartzmonzonite is an intrusive, felsic, igneous rock that has an approximately equal proportion of orthoclase and plagioclase feldspars. It is typically...
form of monzonite. Monzonite is a coarse-grained (phaneritic) igneous rock. Such rocks are classified by their relative percentages of quartz, plagioclase...
The Joaquin quartzmonzonite is a Mesoproterozoic pluton in northern New Mexico. Radiometric dating gives it an age of 1460 million years, corresponding...
Guilford QuartzMonzonite is a Silurian or Ordovician quartzmonzonite pluton in Howard County, Maryland. It is described as a biotite-muscovite-quartz monzonite...
Woodstock QuartzMonzonite is a Silurian or Ordovician quartzmonzonite pluton in Baltimore County, Maryland. It is described as a massive biotite-quartz monzonite...
The San Pedro quartzmonzonite is a Paleoproterozoic pluton in New Mexico. It has a radiometric age of 1730 Mya, corresponding to the Statherian period...
normative quartzMonzonite – Igneous intrusive rock with low quartz and equal plagioclase and alkali feldspar – a plutonic rock with <5% normative quartz Nepheline...
Half Dome is a quartzmonzonite batholith at the eastern end of Yosemite Valley in Yosemite National Park, California. It is a well-known rock formation...
Stone Mountain is a quartzmonzonite dome monadnock and the site of Stone Mountain Park, 16 miles (26 km) east of Atlanta, Georgia. Outside the park is...
Guilford QuartzMonzonite Pluton emplacement Norbeck Intrusive Suite Subvolcanic rock Tuolumne Intrusive Suite Volcanic rock Woodstock QuartzMonzonite Intrusive...
granodiorite) at Monte Adamello, Italy, in 1890, but later came to refer to quartzmonzonite, and is now a deprecated term. Trondhjemite is an orthoclase-deficient...
made mostly of felsic or intermediate rock types, such as granite, quartzmonzonite, or diorite (see also granite dome). Although they may appear uniform...
The Little Diomede island is composed of Cretaceous age granite or quartzmonzonite. The location of the city is the only area which does not have near-vertical...
granodiorite along the margin of the intrusion which grades into a quartzmonzonite in its core. It intrudes through the Wissahickon Formation and the...
Church of Jesus Christ of Latter-day Saints was built of blocks of quartzmonzonite, granite, and granodiorite which Latter Day Saint pioneers quarried...
breaks down to a coarse soil. The inner felsic core is a medium grained quartzmonzonite that gradually grades into granite at the center. The transitional...
Buttermilk Country is renowned for its large "highball" boulders, made of quartzmonzonite. The boulders in the Buttermilks are glacial erratics, meaning they...
was replaced, the inadequate sandstone was replaced. The walls are quartzmonzonite (which has the appearance of granite) from Little Cottonwood Canyon...
Quartz monzogabbro is an intrusive rock intermediate between quartz gabbro and quartzmonzonite. Under the QAPF classification, it is an intrusive rock...
described as "a rock of intermediate composition between quartz diorite and quartzmonzonite". Plymouth Rock is a glacial erratic boulder of granodiorite...
a more modern interior lacking vaulted ceilings. Although built of quartzmonzonite rock from the same quarry as the Salt Lake Temple, the Assembly Hall's...
upon the local silicates' ratios. The quartz biotite gabbro is medium- to coarse-grained, the Climax quartzmonzonite is medium-grained. In the eastern Sudbury...
intersecting small veins of molybdenite form a stockwork in an altered quartzmonzonite porphyry. Like other porphyry-type ore deposits, the ore is low-grade...
1952 using photogrammetry. Denali is a granitic pluton, mostly pink quartzmonzonite, lifted by tectonic pressure from the subduction of the Pacific Plate...
occur in these rocks. A 67 Ma quartzmonzonite pluton lies west and north of the older quartz diorite, a Cretaceous (?) quartz diorite pluton lies to the...
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