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Topic: Anorthosite

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	v52a in sm04
		Anorthosite and granite form large tabular plutons whereas composite ferrodiorite-monzonite intrusions mostly form arcuate dykes, small circular plutons, or narrow remnants in the margins of large anorthosite plutons.
		The anorthosite is further spatially divided into older, partly deformed and recrystallized anorthosite and leuconorite in the west and north, and younger, undeformed and unrecrystallized anorthosite and leucotroctolite in the east and south.
		Proterozoic anorthosite plutonic suites are especially attractive targets for investigating the significance and extent of isotopic differences between crystals, whole rocks, and different intrusions given their typically protracted emplacement histories, range of magma compositions, and slow cooling at mid-crustal depths.
	www.agu.org /cgi-bin/SFgate/SFgate?&listenv=table&multiple=1&range=1&directget=1&application=sm04&database=/data/epubs/wais/indexes/sm04/sm04&maxhits=200&="V52A" (2524 words)

	NASM--Apollo to the Moon--Lunar Anorthosite (Site not responding. Last check: 2007-11-06)
		The ancient crust of the Moon is believed to have been composed of the rock, anorthosite, a calcium-rich white rock.
		One explanation for the presence of anorthosite in the lunar crust is based on the assumption that the Moon was once molten.
		Anorthosite is an important rock type of the lunar highlands and probably formed the primitive lunar crust.
	www.nasm.si.edu /galleries/attm/nojs/wl.an.1.html (223 words)

	Olympus Microscopy Resource Center: Polarized Light Microscopy Gallery - Anorthosite
		On Earth, anorthosite is not as common as basalt or granite and is composed of coarse crystals.
		This term is reflective of the iron and titanium ores that may be readily mined from the rock complexes in the form of ilmenite, magnetite, rutile, and hematite.
		Anorthosite is also sometimes quarried for use as crushed rock or as a building material.
	olympusmicro.com /galleries/polarizedlight/pages/anorthositesmall.html (242 words)

	Untitled (Site not responding. Last check: 2007-11-06)
		Anorthosite is a very unusual rock, not only because it is composed only of calcium plagiclase, but also because it is relatively rare, and forms by mechanisms we do not fully understand.
		Anorthosite is common on the moon, however, composing much of the rugged upland areas (not the smooth mare.) It is likely that when the earth formed anorthosite was one of the more common constituents, just because calcium is a common element in interstellar gas clouds, and planetary nebulae.
		Anorthosite seems to be associated with rifting events, but there is a good liklihood that more than one mechanism is responsible for its formation.
	csmres.jmu.edu /geollab/Fichter/IgnRx/Anortho-1A1.html (220 words)

	[23.04] Lunar Anorthosite Deposits: The Big Picture (Site not responding. Last check: 2007-11-06)
		Anorthosites in the inner rings of basins such as Humorum, Grimaldi, and Orientale were derived from beneath more mafic-rich layers in the pre-impact target sites.
		In addition, the anorthosites associated with the outer rings of Nectaris and other basins are found in the central peaks and walls of large impact craters and were derived from layers deep beneath the crater target sites.
		Farside anorthosite distribution may be largely related to the emplacement of the giant South Pole-Aitken (SPA) basin.
	www.aas.org /publications/baas/v32n3/dps2000/223.htm (325 words)

	GemRocks: Anorthosite
		Several large anorthosite masses around the world have been named on the basis of their locations and are shown on geologic maps and referred to in geologic reports by those binomial names -- e.g.
		, the Marcy Anorthosite of the Adirondack Mountain region of northern New York and the Roseland Anorthosite of Nelson County, Virginia.
		Some of the anorthosite from which this gemrock is recovered is porphyritic, and some of the the relatively large phenocrysts find use for fashioing as, for example, cabochons; these gemstones are, of course, gem minerals rather than gemrocks.
	www.cst.cmich.edu /users/dietr1rv/anorthosite.htm (853 words)

	Ms. Tanya Tettelaar (Site not responding. Last check: 2007-11-06)
		The study area is located at the western boundary of the NPS and focuses on the Pearly Gates Anorthosite pluton and the adjacent mangeritic-charnockitic-jotunitic composite body.
		In the anorthosite, the contact-parallel S-fabric is defined by a 1km partially recrystallized anorthosite/norite 'layered' margin.
		The anorthosite and norite are considered comagmatic from a crustal contaminated mafic magma while the mangerite is derived from crustal partial melting.
	www.esd.mun.ca /archives/seminars/sem_2003/tettelaar_t1.html (313 words)

	DAY 4 (Site not responding. Last check: 2007-11-06)
		Anorthosite is typically the footwall to most of the magnetitite layers to which there is an abrupt contact (Fig.
		Xenoliths of anorthosite are common in the magnetitite layers (Fig.
		Sub-angular fragments of fine-grained gabbronorite or metamorphosed Dullstroom Basalt from the Transvaal Supergroup are present in the footwall anorthosite, and are especially prominent beneath the diapir (Fig.
	www.wits.ac.za /geosciences/bushveld/bush_vftday4i.htm (2462 words)

	Lunar -Anorthosite Display
		Anorthosite is a relatively lightweight silicate rock that forms much of the ancient crust of the Moon.
		Scientists needed to find it on the surface of the Moon to prove the theory that the Moon was once molten, and formed layers of different density rock and metal as it cooled.
		This beautiful sample of terrestrial anorthosite was collected from the same place the astronauts were trained before flight by their geology teachers.
	www.sciencemall-usa.com /anorthosite1.html (218 words)

	November-December GSA Bulletin media highlights
		This result is within error of the emplacement age for the anorthosite and documents that the anorthosite and granitic rocks represent a coeval association of a type known as an AMCG suite.
		A variety of field and laboratory observations indicate that the anorthosite and granitic rocks did not evolve from a common parent.
		The heat responsible for the crustal melting was derived from the anorthosites and related gabbros.
	www.eurekalert.org /pub_releases/2004-11/gsoa-ngb110304.php (2426 words)

	Crustal Origin for Oxide-Sulfide Ores and Anorthosite: (Site not responding. Last check: 2007-11-06)
		Rhenium and osmium abundances and Os isotopic compositions were measured for nine sulfides and four titanomagnetites from the Suwalki anorthosite massif in extreme northeast Poland.
		Os combined with the Proterozoic Re-Os age require that the source for Suwalki anorthosite is crustal and significantly older, possibly involving Archean rocks.
		Os derived from the Re-Os isochron data require that the source for the anorthosite massif and its oxide-sulfide ores is crustal, and not mantle-derived.
	www.cnr.colostate.edu /er/airie/abstracts/1999_EUG-10_Suwalki-Anorthosite.htm (483 words)

	ROLE OF LIMITED CRUSTAL ASSIMILATION IN THE EVOLUTION OF THREE DISTINCT ANORTHOSITE TYPES IN THE LARAMIE ANORTHOSITE ... (Site not responding. Last check: 2007-11-06)
		The Chugwater anorthosite is olivine-free except in the vicinity of troctolitic plutons that intruded when the Chugwater was still a crystal mush.
		The Snow Creek anorthosite is distinguished from the other two by a lack of magnetite and olivine, and local quartz-saturation.
		Other anorthosite plutons exhibit the same range in silica activity as is found in the LAC.
	gsa.confex.com /gsa/2003AM/finalprogram/abstract_65567.htm (419 words)

	Field conference
		Two major parental magmas have been invoked to explain the anorthosite suite: a high-alumina basaltic magma that has given rise to the massif-type anorthosites, and a jotunitic magma that has differentiated with major country rock assimilation into the Bjerkreim-Sokndal layered series of anorthosite/leuconorite, norite, gabbronorite, mangerite and granitoids (igneous charnockites).
		09.00-12.00: The geology of the Rogaland anorthosite province
		A number of localities will be visited, showing typical geological relations in anorthosite diapirs including orthopyroxene and plagioclase megacrysts, inclusions of deformed leuconorite in anorthosite, small (hemo-)ilmenite deposits (Kydlandsvatn) and a nelsonite showing (Hestnes) in the deformed margin of a diapir, and a Ni-deposit (Homsevatn) in a late norite pegmatite.
	www.ngu.no /prosjekter/GEODE/Fconference.htm (1473 words)

	Crystallisation of anorthosite (Site not responding. Last check: 2007-11-06)
		Some anorthosite-troctolites in the Proterozoic Lac St Jean anorthosite complex are almost undeformed and preserve interesting outcrop-scale field relationships and textures.
		The dominance of recrystallisation during the solidification of these rocks may account for field evidence of olivine solution, hence anorthositisation of troctolite, from adjacent outcrops.
		Higgins, M.D., 1998, Origin of anorthosite by textural coarsening: Quantitative measurements of a natural sequence of textural development: Journal of Petrology, v.
	wwwdsa.uqac.uquebec.ca /~mhiggins/alma.htm (286 words)

	SPECULATIONS ON THE ORIGIN OF MASSIVE HEMOILMENITE DEPOSITS ASSOCIATED WITH ANDESINE ANORTHOSITE MASSIFS, GRENVILLE ... (Site not responding. Last check: 2007-11-06)
		The predominance in certain massif anorthosites of this otherwise rare phase implies high fO2 conditions compared with those associated with the crystallization of typical mafic magmas.
		The hemoilmenite in andesine anorthosite also is characterized by a high Geikielite content (typically >10 mol% MgTiO3, but some reach values as high as 25 mol%), which likewise is not a feature of ilmenite found in common mafic igneous rocks.
		In some cases, dikes of hemoilmenite cut the anorthosite, and elsewhere inclusions occur in the ore that range from cm-sized plagioclase xenocrysts to m-sized anorthosite xenoliths.
	gsa.confex.com /gsa/2003AM/finalprogram/abstract_67293.htm (496 words)

	Person Display - Department of Geology and Geophysics - University of Wyoming
		The Laramie Mountains contain two anorthosite complexes, the 1.76 Ga Horse Creek anorthosite complex, and the 1.43 Ga Laramie anorthosite complex.
		The younger, unmetamorphosed anorthosite complex represents an excellent opportunity to investigate magma chamber processes and the petrogenesis of the "anorogenic" anorthosite, syenite and granite plutons.
		The older anorthosite complex was emplaced immediately following the accretion of the Proterozoic Colorado province to the Archean Wyoming province, and represents one of the few anorthosite complexes with a well-understood tectonic setting.
	home.gg.uwyo.edu /Person.aspx?ID=16 (517 words)

	Assistant Professor William Peck (Site not responding. Last check: 2007-11-06)
		The 2.9 billion year old Fiskenaesset Anorthosite Complex is made up of a layered series of anorthosites and gabbros that occur as dissected layers and lenses within the Tasiusarsuaq terrane of southwest Greenland.
		Oxygen and hydrogen isotope ratios indicate that unusual rocks at the upper contact of the Fiskenaesset Anorthosite are the products of hydrothermal alteration by seawater at the time of anorthosite intrusion.
		Because large amounts of surface waters cannot penetrate to depths of 30 km during granulite facies metamorphism, the isotopic signature of the contact rocks must have been obtained prior to regional metamorphism.
	departments.colgate.edu /geology/research/wmgreen.htm?FDSID=31 (233 words)

	Anorthosite (Site not responding. Last check: 2007-11-06)
		In other words, Labradorite, though usually it is the lesser quality specimens that carry the Anorthosite name and the better quality...with people appeal...
		Anorthosites, refers to eruptive rocks of various Diorites which chief mineral is Feldspar.
		Use Anorthosite as the stabilizing element and foundation in any Magickal exercise.
	www.denelder.com /crystals/anorthosite.html (243 words)

	contribs (Site not responding. Last check: 2007-11-06)
		Jobin-Bevans, L.S. Peck, D.C., and Halden, N.M. 1997: Geology and oxide mineralization of the Pipestone Lake Anorthosite Complex, Manitoba.
		Jobin-Bevans, L.S., Halden, N.M. and Peck, D.C., 1996: Geology and Fe-Ti-V oxide mineralization in the Pipestone Lake Anorthosite Complex, north-central Manitoba.
		Jobin-Bevans, L.S., Peck, D.C., Cameron, H.D.M. and McDonald, J.P., 1995: Geology and oxide mineral occurrences of the central and eastern portions of the Pipestone Lake Anorthosite Complex.
	publish.uwo.ca /~ljobinbe/contribs.html (463 words)

	Energy Citations Database (ECD) - Energy and Energy-Related Bibliographic Citations
		Energy Citations Database (ECD) Document #6398839 - Gravity interpretation of the Egersund anorthosite complex, Norway: its petrological and geothermal significance
		Availability information may be found in the Availability, Publisher, Research Organization, Resource Relation and/or Author (affiliation information) fields and/or via the "Full-text Availability" link.
		Gravity interpretation of the Egersund anorthosite complex, Norway: its petrological and geothermal significance
	www.osti.gov /energycitations/product.biblio.jsp?osti_id=6398839 (117 words)

	Chilltop - Encyclopedia
		Anorthosite.com - At this site we have information on anorthosite.
		In addition to advice related to anorthosite we also have the most authoritative websites for encyclopedia, print shop and educational software.
		Anorthosite.com has the best sites on anorthosite on the web.
	www.chilltop.com /Encyclopedia/index.htm (3981 words)

	Mines and Quarries of Ancient Egypt Part II: Expeditions, Settlements, Tools and Transport (Site not responding. Last check: 2007-11-06)
		Another road paved with slabs of sandstone and fossil (petrified) wood connects the Gebel Qatrani basalt quarries with the site of Qasr el-Sagha at the northern end of the Fayoum region, covering a distance of about 10 kilometers.
		The longest known Egyptian quarry road is an 80 kilometer route in Lower Nubia, linking the diorite-gabbro and anorthosite gneiss quarries of the Old and Middle Kingdoms, near Gebel el-Asr, with the closest Nile embarkation point at Tushka (now covered by the waters of lake Nasser).
		However, as Reginald Engelbach found when he made a study of this ancient road, it was not paved, but was only a cleared track through the desert, with occasional scatterings of stone or pottery.
	www.touregypt.net /featurestories/minesandquarries2.htm (3475 words)

	Search Results for anorthosite - Encyclopædia Britannica
		All anorthosites found on Earth consist of coarse crystals, but some samples of the rock taken from the...
		The feldspar-rich rocks larvikite and a few anorthosites are employed as both interior and exterior facing slabs.
		Expand your search on anorthosite with these databases:
	www.britannica.com /search?query=anorthosite&submit=Find&source=MWTAB (307 words)

	A Re-Os Study of the Suwalki Anorthosite Massif, Northeast Poland (Site not responding. Last check: 2007-11-06)
		A Re-Os Study of the Suwalki Anorthosite Massif, Northeast Poland
		Part of the buried crystalline basement in the western East European Platform, the Suwalki intrusion and its Fe-Ti-V magnetite ores lie south of a well exposed E-W belt of 1530-1660 Ma rapakivi granites and anorthosites spanning western Russia, southern Finland, Estonia and Latvia, and Sweden.
		We analyzed separates of titanomagnetite, pyrrhotite-pentlandite, chalcopyrite, and pyrite from drill cores intersecting three deposits: Udryn hosted in anorthosite massif, Jezioro Okragle in anorthosite breccias near the massif margin, and Krzemianka in gabbronorite rimming the massif.
	www.cnr.colostate.edu /airie/abstracts/1998_GSA_Suwalki.htm (322 words)

	anorthosite -- Encyclopædia Britannica
		All anorthosites found on Earth consist of coarse crystals, but some samples of the rock taken from the Moon are finely crystalline.
		Anorthosite is considerably less abundant than either basalt or granite, but the complexes in which it occurs are, nevertheless, often…
		"anorthosite." Encyclopædia Britannica from Encyclopædia Britannica Premium Service.
	www.britannica.com /eb/article-9007715?tocId=9007715 (61 words)

	HISTORY OF EMPLACEMENT AND DEFORMATION OF ANORTHOSITE BODIES IN THE EASTERN MARCY MASSIF, ADIRONDACK MOUNTAINS, NEW YORK (Site not responding. Last check: 2007-11-06)
		HISTORY OF EMPLACEMENT AND DEFORMATION OF ANORTHOSITE BODIES IN THE EASTERN MARCY MASSIF, ADIRONDACK MOUNTAINS, NEW YORK
		The eastern part of the Grenvillian granulite-facies Marcy metanorthosite massif and host-country, supracrustal complexes displays at least three periods of anorthosite emplacement, each followed by regional ductile deformation.
		Metagabbro bodies are spatially associated with shear zones and may have been intruded at several times during these events.
	gsa.confex.com /gsa/2003NE/finalprogram/abstract_51333.htm (221 words)

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