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Topic: Rapakivi granite

	Encyclopedia :: encyclopedia : Granite (Site not responding. Last check: 2007-10-12)
		Quarrying granite for the Mormon Temple, Utah Territory.
		Granite has been intruded into the crust of the Earth during all geologic periods; much of it is of Precambrian age.
		Granite is widely distributed throughout the continental crust of the Earth and is the most abundant basement rock that underlies the relatively thin sedimentary rock veneer of the continents.
	www.hallencyclopedia.com /Granite (588 words)

	Rapakivi granite - Wikipedia, the free encyclopedia
		Rapakivi granite is a hornblende-biotite granite containing large rounded crystals of orthoclase mantled with oligoclase.
		Rapakivi is Finnish for rotten or crumbly rock and describes the tendency of the rapakivi granite to easily weather.
		Rapakivi is a fairly uncommon type of granite, mostly found in southeastern Finland.
	en.wikipedia.org /wiki/Rapakivi_granite (126 words)

	Helsingin yliopisto: Geologian laitos: Henkilökunta:
		Haapala, I. and Rämö, O.T., 1990, Petrogenesis of the Proterozoic rapakivi granites of Finland.
		Haapala, I.J. and Rämö, O.T., 1987, Petrogenesis of the rapakivi granites in Finland.
		Haapala, I., Rämö, O.T., and Tähtinen, M.K., 1992, Orbicular granite from the Suomenniemi rapakivi granite batholith, southeastern Finland
	www.helsinki.fi /geologia/henkilokunta/ramo_publ.html (3574 words)

	686
		Anorthosites are surrounded by norites, gabbronorites and diorites, and enclosed in rapakivi granites.
		The extensive area of rapakivi granites and associated mafic dykes in SE Finland are thought to be associated with rifting in the mid-Proterozoic.
		The transportation of the rapakivi granite magma to subvolcanic levels took place in a mode of subisothermal ascent (whereupon the rapakivi texture was formed), the initial temperature was around 780°C. The magmas solidified at approx.
	www.the-conference.com /JConfAbs/4/686.html (6756 words)

	GEOCHEMISTRY AND GEOCHRONOLOGY OF PROTEROZOIC COMINGLED JACK CREEK RAPAKIVI GRANITE AND MINETTE IN THE NORTHERN BURRO ... (Site not responding. Last check: 2007-10-12)
		One of the granitic suites, the Jack Creek Rapakivi Granite is transitional between A-type and I-type, is characterized by large K-feldspar phenocrysts, some of which are mantled by plagioclase forming the rapakivi texture, and contains synplutonic dikes and enclaves of minette.
		Zircons from the rapakivi granite and minette are pervasively altered and discordant, but yield upper intercept ages of 1461 ± 24 Ma and 1465 ± 16 Ma (2s) that are interpreted as fair approximations of the crystallization ages of the granite and minette, respectively.
		The Jack Creek Rapakivi Granite and minette were presumably emplaced inboard of an extensional arc in response to mafic underplating associated with backarc extension.
	gsa.confex.com /gsa/2002AM/finalprogram/abstract_41582.htm (458 words)

	Volume 34 No. 2
		Paleo- and Mesoproterozoic granite plutonism of Colorado and Wyoming
		Elemental and isotopic compositions of the younger Early Paleoproterozoic granitic plutons are consistent with a systematically increasing crustal component as a function of age in waning orogenic stages of crust formation in the region.
		The Virginia Dale instrusion is a granitic and monzogranitic composite intrursive body at the sourthern extent of the Sherman batholith in southeastern Wyoming and adjacent areas of Colorado.
	pubs.gg.uwyo.edu /CTGs/RMG_34-2.htm (2891 words)

	GemRocks: Granite
		Rapakivi granite (also called "Baltic brown") - Typical Rapakivi granites consist of ovoid masses, with chiefly alkali feldspar cores and relatively thin chiefly off-white plagioclase feldspar mantles, within a so-to-speak continuum of "normal" granite.
		The alkali feldspars in most of Rapakivi granite are salmon colored orthoclase whereas the plagioclases tend to be off-white oligclase; the other common constituents are biotite and/or hornblende.
		Granite (though not as a gemrock) is the state rock of North Carolina; blue granite is the official state rock of South Carolina; and red granite (also not as a gemrock) is the state rock of Wisconsin.
	www.cst.cmich.edu /users/dietr1rv/granite.htm (1305 words)

	Rapakivi granite and basic dykes in the Fennoscandian shield: a palaeomagnetic analysis (Site not responding. Last check: 2007-10-12)
		Rapakivi granite and basic dykes in the Fennoscandian shield: a palaeomagnetic analysis
		Rapakivi rocks and basic dykes in the central part of Sweden have been subject to a palaeomagnetic study with the aim of putting the formation of these rocks into a plate tectonic context.
		Paleolatitudes for the shield at the time of the intrusions were determied to a range from the equator to a 30 degrees North and a hot spot origin was tested as a model for the origin of the rapakivi rocks.
	epubl.luth.se /1402-1544/1998/40 (213 words)

	A.G. Bulakh St. Petersburg Stone Chapter 5 (Site not responding. Last check: 2007-10-12)
		Here rapakivi granite is used for the plinth, stylobates and bases of the pillars supporting the high portal arch resembling the arch of the “New Holland” also built after the design of Vallen de la Mothe.
		The pavement in front of the main doorway is flagged with thick quadrangles of red rapakivi granite (two front and two back lines of the slabs) and with red granite from the Syyskuunsary Island (three intermediate lines of the slabs).
		Two different types of granites were used for it: grey fine-grained Serdobolsky rock and an ornamented grey-pink gneissoid one called “monastic” and quarried by monks of the Valaam monastery on the islands Lutsaary and Janisaary in the middle of Lake Ladoga.
	www.geology.pu.ru /bulakh/Chapter_5.shtml (5170 words)

	Zusi on line (Site not responding. Last check: 2007-10-12)
		The oldest companies in the "natural stone" sector were AB Granit, founded in 1886, and Finska Stenindustri AB, which began operations in 1900 and worked rapakivi granite at Vehmaa since 1901 (Selonen and Paavo, 2003).
		Currently, the main materials quarried are granite and soapstone (a term used to indicate a softer metamorphic rock, also known as steatite or oilstone).
		Rapakivi granite is an anorogenic granite, dating back 1650-1540 million years.
	www.zusieditore.it /Zusi_Editore_ing/gestione_informatore/vis_informatore.asp?id_informatore=212 (969 words)

	anorthosites
		Rapakivi is Finish for rotten or crumbly rock and describes the tendency of the rapakivi granite to easily weather, found throughout the eastern portion of the game refuge in the northern Burro Mountains.
		The petrogenesis of rapakivi granites is controversial and questions remain as to the source of the rapakivi magma, the genetic relationships between the granite and penecontemporaneous mafic rocks, the origin of the rapakivi texture, and the tectonic setting of these rocks.
		Adjacent to the minette, feldspars within the rapakivi granite are locally surrounded by biotite and amphibole from the minette.
	geoinfo.nmt.edu /staff/mclemore/projects/anorthosites.html (1125 words)

	Waupaca
		There are undisputed granitic rocks a few hundred meters to the west on Granite Street, metamorphic rocks a couple of hundred meters to the east along the river, and this appears to be a contaminated border facies.
		This rock type, a perfect example of a rapakivi granite, is not exposed here (although it is at a small quarry north of town).
		Rapakivi granites, named for a locality in Finland, have plagioclase cores rimmed with potassium feldspar, and many of these feldspar crystals show that texture.
	www.uwgb.edu /dutchs/geolwisc/geostops/Waupaca.HTM (494 words)

	DESCRIPTION OF MAP UNITS
		Rare pink garnet bearing aplitic granite dikes cut this rock as thin, one to two centimeter straight walled dikelets; these may be a late differentiated phase.
		Intruded by light grayish pink, coarse grained trachytic and weakly porphyritic granite that may be either a differentiated phase of the diorite or an external intrusion.
		Intruded by mildly deformed pyroxene homblende syenite and hornblende biotite granite of unknown affinity.
	www.soilandwater.co.stearns.mn.us /Lakeshed_Project/bedrock_data.htm (1126 words)

	A.G. Bulakh St. Petersburg Stone Chapter 3 (Site not responding. Last check: 2007-10-12)
		Usually granite has a clear granular homogeneous texture and is generally pink or grey, in spite of various colours of grains of different minerals composing the rock.
		Cut from this granite is the well known Alexander Column, and constructed of blocks of the rock is the monument to those who had fallen in the struggle during the Civil War, February and October revolutions (the monument had been erected in the middle of the Field of Mars).
		Rapakivi-granites; Karlahti granite from modern quarries in the vicinity of Priozersk (Railway Station Kuznechnoye); Gneissoid granite; Porphyry granite Vozrozhdeniye from the Karelian Isthmus.
	www.geology.pu.ru /bulakh/Chapter_3.shtml (8959 words)

	Republican unique stones museum, Mosedis, Lithuania, Europe
		Translated from Finnish, rapakivi in Lithuanian, means "rotting stone", as the decay and sunken ovoid rings are evident.
		In some instances, large rapakivi have several generations of ovoids found within one another: that is, within a large ovoid, a smaller one is found.
		Aland rapakivi and granite boulders are for the most part, oval, ball like or weathered to a smooth, round shape.
	www.fortunecity.com /millennium/po/1164 (1012 words)

	SIGNIFICANCE OF RAPAKIVI GRANITES AND COMINGLED DIABASE ENCLAVES AND SYNPLUTONIC DIKES, LITTLE HATCHET MOUNTAINS, NEW ... (Site not responding. Last check: 2007-10-12)
		In the southern Little Hatchet Mountains, in Hidalgo County, NM, relatively unaltered outcrops of hornblende granite, rapakivi granite, and diabase form a pluton of 5 by 4 km of presumed Proterozoic age.
		The rapakivi granite, found north of the hornblende granite is pink-gray to red-orange and medium to coarse grained and is characterized by large K-feldspar phenocrysts, many of which are mantled by plagioclase forming the rapakivi texture.
		Inasmuch as the exact age of the Little Hatchet Mountains rapakivi suite is not yet known, its significance in terms of the tectonic evolution of soutwestern Laurentia margin remains to be established.
	gsa.confex.com /gsa/2001RM/finalprogram/abstract_5901.htm (404 words)

	Greenland 27.7-8.8 2003 (Site not responding. Last check: 2007-10-12)
		Some time after three deformation phases and under a fourth and probably fifth deformation phase Rapakivi granite (or rather a rapakivi suite of noritic to syenitic plutons) was intruded in the south/south-eastern part of the Ketilidians.
		Typical of Rapakivi granites (rapakivi textures) are round to oval balls with a core of kali feldspar (orthoclase) overgrown with (a rim of) plagioclase.
		The timing of the ketilidian orogeny seems to coincide with the assembly of a suggested Hudsonia supercontinent (Dubbed "Columbia" by Professor John J.W. Rogers according to the news from Space Daily of 18 March 2002 and BBC News of 25 march 2002 later (2003) referred to as Hudsonland and most recently Hudsonia).
	users.skynet.be /ougseurope/greenland/tectonics.htm (522 words)

	MKK-Holding - Products - Types of processing (Site not responding. Last check: 2007-10-12)
		Granite - rapakivi, pinkish-grey and grey, with quartz contents of 27%.
		Granite is medium-grained, sometimes coarse-grained, porphyraceous, brownish or pinkish grey.
		The coarse-grained granite is large and irregular grained, bright and pink-red.
	www.mkk-hold.ru /en/products/factura.html (44 words)

	PLK's Granite research (Site not responding. Last check: 2007-10-12)
		The Danswell Creek granite and the Wangrah granite are mutually exclusive with the former only found in the northern part of the complex and the latter only in the south.
		Miarolitic cavities and pegmatitic vugs are reasonably common in some portions of this granite, suggesting that the granite was emplaced at a shallow level (Burnham and Ohmoto, 1980) and that the late-stage crystallisation of water-saturated volatiles occurred (London, 1986).
		The majority of K-feldspar crystals in the granite are white, although pink crystals occur in the southern portion of the granite.
	www.uwo.ca /earth/king/research/penny_granite.html (3550 words)

	Pre-Quaternary rocks (Site not responding. Last check: 2007-10-12)
		The Laitala rapakivi granite batholith extends as a narrow strip to the northeastern and southeastern corners of the map sheet.
		The Eurajoki rapakivi granite stock is well exposed in the northeastern corner of the map-sheet area.
		The rapakivi granites are crosscut and overlain by post-Jotnian medium-grained, subophitic olivine diabase intrusions.
	www.gsf.fi /info/kps1132en.html (255 words)

	LITOS: Natural stone development in Finland
		The two main granite production centres are the rapakivi granite areas in southwestern and in southeastern Finland, while soapstone is produced mainly in the municipality of Juuka in eastern Finland.
		Granite is extracted in large volumes from 20-30 sites as rough blocks for the export markets.
		The main rock type is rapakivi granite, which is quarried in SW and in SE Finland.
	www.litosonline.com /articles/82/ar8202e.shtml (1778 words)

	MYRMEKITE 26 OF 50
		The presence of microcline and myrmekite suggests that the layered granite was once really a former layered gabbro in which K-bearing fluids moved through zones of deformation to cause biotite to form in the mafic layers and to create myrmekite and primary microcline in the felsic layers.
		It should also be emphasized that most rapakivi granites are large massive bodies, lacking any layered appearance and have a primary magmatic origin rather than a metasomatic origin.
		(1) Melting of sediments of appropriate composition, (2) partial melting (anatexis) of granitic components of mafic rocks and separation (migration) of this granitic melt to form a magma, and (3) crystal settling of mafic components (magmatic differentiation) in a magma are three generally accepted hypotheses.
	www.csun.edu /~vcgeo005/primary.htm (3551 words)

	redrockabs
		The Jack Creek rapakivi granite was presumably derived from a source characterized by subtle, long-term LREE enrichment, whereas that of the Redrock granite pluton was slightly depleted.
		The rapakivi granite shows too narrow a spread in the Sm-Nd ratio for chronological inferences but is coeval with the lamprophyre on the basis of field relations; both rock types show similar Nd model ages (~1600 Ma).
		The margins of the synplutonic dikes and isolated enclaves show evidence for intensive mingling with the rapakivi granite host: quartz and alkali feldspar megacrysts have been mechanically incorporated into the lamprophyre and the quartz xenocrysts are often mantled by amphibole.
	geoinfo.nmt.edu /staff/mclemore/abstracts/redrockabs.html (1766 words)

	Greenland (Site not responding. Last check: 2007-10-12)
		Two views of the Qernertoq rapakivi granite (dark coloured rocks) from the east.
		Folded garnetiferous granite and pegmatites in pelite to the north of Prins Christian Sund (c.
		S-type (garentiferous) granite intrusions (pale rocks) that are syn-tectonic with respect to top north shearing in their host metapelite.
	www.dur.ac.uk /react.res/RRG_web/greenland.htm (141 words)

	MYRMEKITE 40 of 50
		The assumption was made that the thicker, interleaved, rapakivi granite layers were primary and undeformed and that the parallel hornblende-pyroxene mafic layers formed by crystal settling in a granitic magma.
		That is, the rapakivi granite layers are not primary, as suggested by Finch et al.
		On that basis, a prediction was made that the megacrystal granitic rocks were once plagioclase-rich diorite or gabbro lacking K-feldspar, and because this plagioclase-rich rock was interlayered with parallel amphibolite bands, then the megacrystal rock might have been a former layered diorite or gabbro.
	www.csun.edu /~vcgeo005/Wanup.htm (6958 words)

	Summary of Citation (Site not responding. Last check: 2007-10-12)
		Consists of coarse-grained post-tectonic biotite granite and rapakivi granite that intrudes Middle Proterozoic gneiss of the Mount Holly Complex.
		Chemical data show that the Stamford Granite on Hoosac Mountain and at the type locality are two separate plutons, the original contacts and shapes of which are not known.
		A dike-like feature of Stamford Granite, found near eastern margin of Green Mountain massif near locality 1 on this map (represented by sample 172), was incorrectly referred to as a probable Late Proterozoic diabase dike by Ratcliffe on his section of the Bedrock Map of Massachusetts (Zen and others, 1983).
	ngmdb.usgs.gov /Geolex/Refsmry/sumry_3952.html (354 words)

	Welcome to Trade International, Inc. -- Articles
		Granites, gabbros and migmatites are quarried especially from the Archean to Proterozoic shields and Hercynian Belts.
		Rapakivi (Finnish word) is the type of granite with red colour and characteristic structure and mode of disintegration in the course of weathering.
		The ancestor of the granite in the Jurassic period was gabbro, quarried as a ACADEMY BLACK (Irwin, Wooden, 2001).
	www.trade-international.net /articles_naturalstone.html (8086 words)

	Oldham and Glodwick - September 2005 (Site not responding. Last check: 2007-10-12)
		Rapakivi or ‘Baltic Brown’ is a hornblende-biotite granite with large rounded orthoclase crystals mantled with oligoclase.
		Rapakivi is Finnish for rotten and describes the tendency of the granite to easily weather.
		Older buildings in town are predominantly constructed of sandstones and native granite, not the corporate or ‘signature’ exotic claddings favoured by modern enterprises.
	www.mangeolassoc.org.uk /oldhamandglodwicksept2005.htm (648 words)

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