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Topic: Quartz monzonite

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Douglas MacArthur

World Series

	Untitled (Site not responding. Last check: 2007-11-02)
		Monzonite is one of three rocks dominated by feldspar (the others being anorthosite and syenite) with occasional other minerals thrown in in lesser amounts (although the rock can go 100% plagioclase.) The plagioclase is sodium rich, unlike anorthosite which is calcium rich.
		Monzonites with quartz 5-20% are "quartz monzonites." Less than 5% quartz and the rock is just monzonite.
		Monzonite is not a common rock, but is typically found around the edges of other felsic plutons, such as plagiogranites or granodiorites.
	csmres.jmu.edu /geollab/Fichter/IgnRx/Monzon-1A1.html (97 words)

	Quartz
		Quartz is a common and often essential mineral in a wide variety of sedimentary, metamorphic and igneous rocks.
		Quartz Adjacent to Biotite and Sillimanite in a Pelitic Gneiss
		In the PP view, the sillimanite and quartz are colorless, the biotite is brown to tan, and the magnetite is opaque (fl).
	www.und.nodak.edu /instruct/mineral/320petrology/opticalmin/quartz.htm (988 words)

	Black Canyon of the Gunnison National Park - Vernal Mesa Quartz Monzonite (U.S. National Park Service)
		The term "Vernal Mesa Quartz Monzonite" was coined by J. Hunter in 1925 during his research in the Black Canyon of the Gunnison.
		The quartz monzonite is extremely resistant to erosion, so as the river cuts down and makes the canyon deeper, the hard rock keeps the walls from eroding and widening.
		Vernal Mesa Quartz Monzonite derives its name from Vernal Mesa which encompasses the majority of the South Rim of the Black Canyon.
	www.nps.gov /blca/naturescience/quartz_monzonite.htm (552 words)

	Quartz monzonite - Wikipedia, the free encyclopedia
		Quartz monzonite is a felsic igneous rock that has an approximately equal proportion of orthoclase and plagioclase feldspars.
		Quartz monzonite porphyry is often associated with copper mineralization in the porphyry copper ore deposits.
		Because of its coloring it is often confused with granite, but wheras the mass of granite is 20% quartz, quartz monzonite is only 5-20% quartz.
	en.wikipedia.org /wiki/Quartz_monzonite (183 words)

	MYRMEKITE 24 OF 50
		The copper-bearing, porphyritic quartz monzonite that occurs in the eastern part of the pluton, south of Ajo (Fig.
		The granodiorite is intrusive into the quartz diorite, and in late stages, concentrations of volatile components beneath the roof permitted K- and Si-rich aqueous fluids to impregnate, resorb, and replace earlier-formed zoned plagioclase crystals by K-feldspar (orthoclase).
		In later stages the orthoclase in quartz monzonite penetrates the exterior of the plagioclase crystals (Fig.
	www.csun.edu /~vcgeo005/ajo.html (2258 words)

	Yosemite National Park Rocks
		Granite, granodiorite, tonalite, quartz monzonite, and quartz monzodiorite are all forms of plutonic rock that are found in Yosemite, and are loosely referred to as granitic rocks.
		Quartz diorite, diorite and gabbro are plutonic rocks found in Yosemite, but are not technically considered to be granitic rocks.
		Plutonic rocks are primarily comprised of 5 minerals: quartz, potassium feldspar, plagioclase feldspar, biotite, and hornblende.
	www.scienceviews.com /parks/yrocks.html (443 words)

	PI-60 - Utah Geological Survey
		Eight hundred railroad carloads of quartz monzonite (a granite-like stone) from the Little Cottonwood stock in Little Cottonwood Canyon, Salt Lake County were used for the exterior.
		Quartz monzonite is very similar to granite but has a different ratio of quartz to feldspar minerals (granite contains more quartz).
		The last quartz monzonite stone used in the construction of the Utah State Capitol was delivered directly to the Capitol from Little Cottonwood Canyon on February 11, 1915 by a railroad line built to transport construction materials to Capitol Hill.
	geology.utah.gov /online/pi-60/pi60st01.htm (613 words)

	Smokey quartz & feldspar crystals - Utah Geological Survey
		Rock compositions range from quartz monzonite in the northern half of the pluton to granite around Rock Corral Canyon in the south.
		Excellent crystals of smoky quartz and feldspar are found in vugs or cavities in the granite.
		Quartz occurs as clear to smoky, euhedral crystals up to three inches long while microcline is commonly found as euhedral, equidimensional crystals averaging approximately 0.75 inches in width.
	geology.utah.gov /utahgeo/rockmineral/collecting/quartz.htm (501 words)

	Commerce Group Corp. - About Us: Mining - San Sebastian Mine
		The quartz monzonite dike appears to have utilized the same crustal zone of weakness as the trachyte, and may have been the heat source for the mineralizing hydrothermal system.
		Evidence of steep-seated structures that controlled the extrusion of the trachyte and the intrusion quartz monzonite dike is not apparent in the vicinity of the mine.
		Silicification is primarily restricted to the trachyte, whereas, argillic alteration is pervasive throughout the trachyte and quartz monzonite.
	www.commercegroupcorp.com /AboutUs/Mining/SanSeb.htm (2369 words)

	Mohawk Mine/Copper World Mine (Site not responding. Last check: 2007-11-02)
		Joseph (1984) suggests that the quartz "vein" of Hewett is a skarn zone formed during intrusion of the Clark Mountain stock.
		Quartz monzonite adjacent to ore zones has been subjected to moderate to strong sericitic alteration and weak argillic alteration.
		Biotite in the quartz monzonite is pervasively altered to chlorite.
	geology.csupomona.edu /drjessey/fieldtrips/mohawk/mohawk.htm (1543 words)

	Adanac Moly - British Columbia Ministry of Energy, Mines and Petroleum Resources, Van, British Columbia
		The stock is a composite quartz monzonite intrusion that cuts through deformed and metamorphosed Pennsylvanian and Permian-age volcanic and sedimentary strata (Cache Creek Group), serpentinite (Atlin Intrusions), and Jurassic diorite (Fourth of July Batholith).
		The fine-grained quartz monzonite appears to be a late intrusion emplaced along part of the axis of the higher-grade zone.
		It is markedly linear and it is the locus of intrusion of a late, fume-grained phase of quartz monzonite.
	www.adanacmoly.com /adanac_rubycim.php (2429 words)

	Commercial Quarry, Crestmore, California
		The quartz monzonite porphyry grades into pegmatite, and both the porphyry and the fairly numerous pegmatitic dikes and irregular pegmatitic patches are closely associated with the silicate contact rock.
		Metamorphic zones near the quartz monzonite porphyry contact cannot be well ascertained, but the presence of large blocks of dark gray-green spurrite-bearing rock in the talus all along the face is notable.
		Locally in the vicinity of the quartz monzonite porphyry and its associated pegmatites, the garnet zone is very greatly enlarged, and is characterized by paler garnet than elsewhere, and by the presence of numerous additional silicate minerals.
	www.minsocam.org /msa/collectors_corner/arc/crestmoreca2.htm (9813 words)

	Phosphates - Castle Dome, Arizona
		The host rock is a body of quartz monzonite intruded into pre-Cambrian schists and quartzites and possibly into the lower part of the overlying Paleozoic strata.
		The quartz monzonite is much older than the copper mineralization which is probably genetically related to the Schultze granite south of the deposit.
		The mineralizing solutions altered the quartz monzonite bordering the veins to quartz and sericite and caused general argillic alteration of the plagioclase throughout the mineralized area.
	www.minsocam.org /msa/collectors_corner/arc/castle_dome.htm (3164 words)

	Svecofennian granitic pegmatites (1.86-1.79 Ga) and quartz monzonite (1.87 Ga) ... (Site not responding. Last check: 2007-11-02)
		The porphyritic Luopa quartz monzonite (1.87 Ga, U-Pb zircon age) is located at the boundary of the Central Finland Granitoid Complex and the Bothnia Belt.
		The Luopa quartz monzonite is composed of three different rock varieties: a dark green fayalite-augite-hornblende quartz monzonite, a dark green augite-hornblende-biotite quartz monzonite and a light-coloured hornblende-biotite quartz monzonite.
		The quartz monzonite was emplaced at a relatively high crustal level and it cuts the main regional deformation phase (D2).
	www.gsf.fi /info/sp30abs.html (1064 words)

	New Page 1
		Semi-ductile mylonitic deformation of precambrian quartz monzonite augen gneiss is followed by further cataclastic deformation, exhibited in chlorite breccia, cataclastic mylonitic gneiss, pseudotachylite, and brecciated mylonitic gneiss.
		In general, the phyllosilicates in proterozoic granodiorite and quartz monzonite is mainly biotite with porphyroblastic muscovite, whereas Tertiary granite has muscovite and rare biotite.
		A rule of thumb: the darker mylonite gneiss is proterozoic granodiorite to quartz monzonite and the lighter slightly-mylonitic gneiss is Tertiary leucogranites.
	webpages.charter.net /cmcc-3d/explore/tectonites/tectonites.htm (1460 words)

	Discussion part 1
		Nonetheless, and in accordance with preferred classification schemes for igneous rocks, the term quartz monzodiorite is appropriate for the phanerite and latite for the porphyry.
		It can be seen from Figure 110 that approximately half of the samples that have been named (quartz) monzodiorite by various authors plot as (quartz) monzonite on the Q'-ANOR diagram and that nearly all plot in the fields of quartz-saturated rocks and not in the fields of quartz-oversaturated rocks.
		The fact that samples of quartz monzodiorite from the Ok Tedi deposit, and from other locations throughout the world, show similar distributions on the common classification diagrams suggests that the problems that I experienced in applying the petrographic nomenclature to the least-altered rocks at Ok Tedi are not unique to this investigation.
	www.fortunecity.co.uk /safaripark/lamprey/108/discus01.htm (1350 words)

	Zapot pegmatite mineral county, The Mineralogical Record - Find Articles
		The earliest and most extensive zone of the pegmatite is in contact with the quartz monzonite phase of the batholith and is in intrusive contact with limestones of the Luning Formation.
		The contact with the quartz monzonite phase of the batholith is sharp to gradational.
		Individual quartz bands range in thickness from 1 to 11.5 cm and may form cavities at their upper contact which are lined with quartz, microcline, albite, needle-like fl schorl, rare topaz and occasional pink beidellite.
	www.findarticles.com /p/articles/mi_qa3672/is_199907/ai_n8875608/pg_3 (581 words)

	Active Mines in Colorado
		Ore minerals occur in veins, fracture zones, and breccias in a quartz latite porphyry intrusive related to the Summitville and Platoro calderas.
		Silver and lesser gold ore occurs in quartz veins which were emplaced in open fractures and fissures created by faulting and subsidence of the mid-Tertiary Creede Caldera.
		Quartz veins in the district also produced molybdenum and tungsten, especially during World War I. Monarch – Lead, silver, zinc, and a little gold and copper were produced mainly from replacement deposits in Paleozoic limestone and dolomite.
	geosurvey.state.co.us /Default.aspx?tabid=178 (1994 words)

	6-km Vertical Cross Section Through Porphyry Copper Deposits, Yerington District, Nevada: Multiple Intrusions, Fluids, ...
		These low-sulfur sulfide assemblages are disseminated and in quartz veinlets and there is a direct correlation between volume percent quartz veinlets and grade of copper: highest grades of copper at the Yerington mine occur in zones with 10-25 vol% quartz veinlets.
		Igneous quartz in the early equigranular phases of the batholith contains liquid- rich L-V fluid inclusions with halite, sylvite and hematite daughters, interpreted to have been trapped during crystallization of quartz monzodiorite and quartz monzonite.
		Possibly primary L-V fluid inclusions in quartz homogenize to liquid at 100 to 250 C and yield salinities of 2 to 13 (mostly 2 to 5) wt % NaCl equiv.
	pangea.stanford.edu /research/ODEX/marco-yerington.html (2888 words)

	Quartz monzonite biography .ms (Site not responding. Last check: 2007-11-02)
		The granite in Joshua Tree National Park is composed primarily of quartz monzonite.
		It is a very abrasive granite as small sharp crystals within the rock do not wear down as quickly as the rock matrix it is embedded in.
		Quartz monzonite is also found in Black Canyon of the Gunnison National Park
	www.biography.ms /Quartz_monzonite.html (108 words)

	Description of the Different Rock Types Used as Building Material (Site not responding. Last check: 2007-11-02)
		Lac Du Bonnet: This coarse grained igneous rock is a type of granitic rock that is specifically identified as a quartz monzonite.
		The main minerals evident in the rock are potassium feldspar, plagioclase feldspar, quartz, sericite, biotite, and muscovite.
		The main minerals evident in the rock are quartz, potassium feldspar (microcline), plagioclase feldspar, and biotite.
	www.uwm.edu /Dept/Geosciences/Urban_Geology/rockdescription.html (1669 words)

	Geologic Setting
		It was classified as quartz latite porphyry by Bamford and others (1972), whereas Arnold and Fitzgerald (1977), and Arnold, Griffin, and Hodge (1979) considered it to consist of quartz monzonite porphyry and monzonite porphyry.
		The quartz veins and veinlets that comprise the stockwork vary in density from relatively sparse at the outer margins of the "quartz core" to as much as 100 percent of the rock at the center.
		Arnold and Fitzgerald (1977) and Arnold, Griffin, and Hodge (1979) described the rocks of the Ningi intrusion as altered and unaltered monzonite and quartz monzonite porphyries that were identical in appearance and mineralogy to the rocks of the Mt. Fubilan intrusion.
	www.fortunecity.co.uk /safaripark/lamprey/108/geolset.htm (3427 words)

	Colorado Rocks
		Their fine-grained feldspar and ferromagnesian minerals quickly weather to clays, and their free quartz crystals are already silt-size or smaller.
		Quartz grains battered down to silt size go into suspension in flowing water, where they are largely immune from further diminution and rounding by impact and abrasion.
		Quartz grains are usually clear or gray, most clay minerals are faintly green at best, and carbonates tend to be white, gray or even faintly blue.
	www.cliffshade.com /colorado/rocks.htm (9545 words)

	13 Claims in New Mexico
		The Tres Hermanas Mountain consist predominantly of a quartz monzonite stock, dated as 50.3+2.6 Ma (hornblende, K-Ar; Leonard, 1982) and are surrounded by a thick sequence of predominantly Paleozoic and Cretaceous sedimentary rocks and Tertiary volcanic rocks (Balk, 1961; Griswold, 1961; Leonard, 1982).
		Geochemical data are consistent with a source of mineralization from the quartz mozonite, although locally the older bedrock may have contributed metals (Doraibabu and Proctor, 1973).
		Disseminated pyrtie, chalcopyrite, sphalerite, and galena occur sporadically throughout the quartz monzonite stock, suggesting the potential for a porphyry copper and/or copper-molybdenum deposit; although the stock is not extensively altered as typical porphyry copper deposits.
	www.goldandsilvermines.com /claims13.htm (703 words)

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