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	Greenstone belt - Wikipedia, the free encyclopedia
		Greenstone belts are so called because of the green hue imparted by the chlorite minerals within the rocks.
		Greenstone belts are mainly found in Australia, southern Africa, and Canada, and may be found included within igneous and metamorphic rock such as basalt, granite and gneiss.
		The best known greenstone belt in the world is the South African Barbeton Greenstone belt, which led to the first discovery of gold in South Africa.
	en.wikipedia.org /wiki/Greenstone_belt (197 words)

	Encyclopedia: Greenstone
		It is composed of chlorite and epidote which makes the greenstone a mid to dark green colour.
		Greenstone is highly valued by the Maori and it plays an important role in their culture.
		Greenstone is a very hard stone and must be worked with care and patience.
	www.nationmaster.com /encyclopedia/Greenstone (237 words)

	CHAPTER 8: Cryptozoic (Precambrian) History
		Between protocontinents are belts of metamorphosed oceanic crust (greenstone belts) and sedimentary cover representing the margins of protocontinents that were deformed during collisions.
		Greenstone belts were generally deposited in oceanic settings although the occurrence of associated andesitic and rhyolitic rocks suggests nearby volcanic arcs.
		Greenstone belts are abundant in the Superior and Slave Provinces of the Precambrian Shield in Canada.
	www.uh.edu /~geos6g/1376/cryptozoic8.html (2735 words)

	Geology Barberton South Africa
		Greenstone Belts: The Greenstone Belts get their name from the presence of green minerals such as the chromium muscovite “fuchsite”, green chlorite, actinolite, serpentine, epidote and amphiboles.
		The rocks occur as belts of deformed volcanic and sedimentary strata.
		The rocks of the Barberton greenstone belt are assigned to the Barberton sequence and comprise a variety of early Archaean volcanic, igneous and sedimentary lithologies.
	www.barberton.info /geology.htm (435 words)

	Ministry of Mineral Resources - Sierra Leone (Site not responding. Last check: 2007-08-19)
		Greenstone belts of the Kambui Supergroup are believed to have been deposited upon a post-Leonean basement and accompanied by basic to ultrabasic intrusives.
		These greenstone belts comprise a lower volcanic unit composed of ultrabasic lavas and basic lavas with pillow layers, overlain by a sedimentary unit comprising tuffs, politic and psammitic sediments, with conglomerate layers and ironstone bands.
		The greenstone belts are the principal hosts of the gold mineralization of the country.
	www.minmines-sl.org /geology.htm (908 words)

	GEOLOGY
		This is composed of a similar granitic basement with narrow greenstone belts; within the greenstone belts, the sequence consists of basic volcanics, covered by greywackes, shales, and conglomerates.
		The Limpopo belt runs E-NE separating the Rhodesian and Transvaal massifs, and is a belt of high-grade metamorphic rocks involved in a long cycle of metamorphism and deformation that ended 2,000 million years ago, after the stabilisation of the adjacent massifs.
		The Mozambique belt is a 4,000-km/2,400-mi long belt of high-grade metamorphic rocks, representing a mobile belt which began forming in Precambrian times and underwent several phases of folding and metamorphism before its final phase of regional metamorphism some 600 million years ago at the end of the Precambrian.
	www.fortunecity.com /oasis/skegness/394/geology.htm (1417 words)

	ARCHAEAN GREENSTONE BELT RESEARCH (Site not responding. Last check: 2007-08-19)
		In both regions the gold is associated with ferruginous banded iron-formations and cherts and appears to be structurally controlled in folded, faulted and brecciated areas of the greenstone belt.
		3.an ongoing study aimed at evaluating the structural history of the southern part of the Barberton greenstone belt with emphasis on the role of granite intrusion in the structural evolution of the region.
		1.a study of the contact relationships between the mafic and ultramafic successions of the Sandspruit greenstone remnant in the North Riding area and the intrusive, potash-rich, granitic rocks surrounding the remnant (includes a study of the affects of potash metasomatism of harzburgite/pyroxenite rocks of the greenstone remnant and the development of hybrid dioritic rocks).
	www.wits.ac.za /geosciences/greenstone/greenstone.htm (851 words)

	Tanrange Exploration - Lake Victoria Greenstone Belt - Tue Jul 19, 2005
		The greenstone belts contain clastic debris of older granitic and gneissic basement and locally abut gneiss belts, which are demonstrably and geochronologically older.
		The greenstone belts occur as lenses surrounded by granitoid rocks.
		The Archean granitoid-greenstone belts of the Lake Victoria Goldfield are bordered to the west by the Proterozoic Ubendian mobile belt.
	www.tanrange.com /s/LakeVictoria.asp (1577 words)

	Manitoba Geology 2 - Manitoba Geological Survey - Mineral Resources Division - Manitoba Industry, Economic Development ... (Site not responding. Last check: 2007-08-19)
		The Bird River greenstone belt is a diverse mafic to felsic Neoarchean volcanic sequence that contains a distinctive chromite- and PGE- enriched layered mafic-ultramafic intrusion, the Bird River Sill.
		The Flin Flon Belt (FFB) is in the juvenile internal zone of the Trans-Hudson Orogen and consists of Paleoproterozoic volcanic, plutonic and minor sedimentary rocks.
		The Paleoproterozoic Lynn Lake and Rusty Lake greenstone belts occur in the interior (Reindeer) zone of the Trans-Hudson Orogen, that is, in the zone formed as new ocean floor, or in oceanic to continental volcanic arcs and related marine and continental sedimentary basins.
	www.gov.mb.ca /itm/mrd/geo/exp-sup/mbgeology2.html (3344 words)

	Miramar Mining Corporation - Hope Bay Project - Tue Jul 19, 2005
		Miramar has been exploring the Hope Bay belt since 1999 and believes that gold resource identified to date (in excess of 5 million ounces of gold) may be just the beginning of a new gold camp that could see Hope Bay provide the cornerstone for the development of Miramar into a significant gold producer.
		The belt comprises mafic meta-volcanic and meta-sedimentary rocks that are bound by Archean granite intrusives and gneisses.
		The greenstone package has been deformed during multiple events and is transected by major north-south trending shear zones that appear to exert a significant control on the occurrence of mineralization, particularly where major flexures are apparent and coincident with antiforms.
	www.miramarmining.com /s/HopeBayProject.asp (559 words)

	Gold Potential of the Lynn Lake Greenstone Belt - Mineral Potential Summaries - Manitoba Geological Survey - Mineral ... (Site not responding. Last check: 2007-08-19)
		Both belts are characterized by mafic metavolcanic rocks that represent a wide variety of tectonic affinities, suggesting that the assembly of the greenstone belt involved significant tectonic juxtaposition early in its deformational history.
		The southern belt is composed of submarine metavolcanic and metavolcaniclastic rocks, with tectonic affinities ranging from tholeiitic to calc-alkaline, and minor amounts of mid-oceanic ridge basalt (MORB) and ocean island basalt (OIB) that contribute to a complex tectonostratigraphy.
		In the eastern portion of the belt, the JSZ is localized along the contact between the Wasekwan Group and overlying Sickle Group to the north and the Pool Lake Suite to the south.
	www.gov.mb.ca /itm/mrd/geo/newdev/gold-lylake.html (2877 words)

	Untitled
		a distribution and abundance of greenstone belts not seen in the younger geologic record.
		Greenstone belts terrestrial equivalent of lunar maria (illustrated in class)
		If greenstone belts are island arcs, they differ in composition from modern arcs and lack the zonal differences associated with polarity of the subducting slab.
	www.clas.ufl.edu /users/pciesiel/gly3150/archean.html (397 words)

	PRECAMBRIAN BASEMENT OF GREENLAND (Site not responding. Last check: 2007-08-19)
		Greenstone belts throughout the Nuuk region have long been recognised as showing potential for economic mineralisations.
		Investigation of the greenstone belts has revealed that they are markedly different in their lithostratigraphy, structure and metamorphic grade.
		Another significant goal will be to map and characterise a large greenstone belt in the southern part of the map, which is poorly known but larger in area than the Ivisartoq belt.
	www.geologiskundersoegelse.dk /departments/geol-mapping/projects/map_nuuk_region-dk.htm (1049 words)

	Tanrange Exploration - Itetemia Property - Tue Jul 19, 2005
		There are five greenstone belts in the Southwest Mwanza Region, one of which is the Ushirombo belt, an east-west trending greenstone belt.
		The eastern portion of the Ushirombo Nyanzian greenstone belt underlies the Itetemia property.
		The Nyanzian greenstone belt underlies Sixty percent of the Itetemia, Itetemia North and Ngula licences.
	www.tanrange.com /s/Itetemia.asp (3097 words)

	Western Churchill NATMAP Proposal Document (Site not responding. Last check: 2007-08-19)
		The goals are to determine (i) if the individual segments of the "belt" are related or independent, (ii) their original tectonic settings, and (iii) their genetic relationship to the growth of the WCP as a whole.
		In 3D, the boundaries of the greenstone belt may not conform to the gross orientation of mappable structures in its interior.
		In all of the greenstone belt projects, the tectonostratigraphy set up during the field work will be tested and modified by geochronology and lithogeochemistry, which will also provide constraints on their tectonic settings.
	www3.sympatico.ca /simon.hanmer/Churchill_NATMAP_proposal.html (5950 words)

	Latest News - Republic of Botswana (Site not responding. Last check: 2007-08-19)
		Gallery Gold is now drilling the area with greenstone belts to identify sufficient reserves to extend mine life from the present six years to more than ten years.
		From the company history, in 1996 it was recognised that the surrounding greenstone belts had good potential for the discovery of significant gold discoveries and the company increased its tenement holdings.
		In 1988, the company’s extensive geochemical analysis of the Tati greenstone belt near Francistown identified Mupane deposits and subsequently confirmed as the basis of a significant mining operation.
	www.gov.bw /cgi-bin/news.cgi?d=20031212&i=Gallery_Gold_Limited_discovers_greenstone_belt (534 words)

	Gold (Site not responding. Last check: 2007-08-19)
		Three environments/styles are most common: gold in greenstone belts, gold in porphyry deposits, and gold in epithermal deposits.
		Greenstone belts are volcanic-sedimentary sequences, which include ultramafic rocks, dolerite, basalt, chert, sandstone, shale, tuff, banded iron-formation and other rock types.
		Gold is most commonly found along the edges of greenstone belts and associated with structural features.
	volcano.und.nodak.edu /vwdocs/minerals/gold.html (761 words)

	Dr. Ali Polat (Site not responding. Last check: 2007-08-19)
		Polat, A., Kerrich, R., and Wyman, D. Geochemical diversity in oceanic komatiites and basalts from the late Archean Wawa greenstone belts, Superior Province, Canada: trace element and Nd Isotope evidence for a heterogeneous mantle.
		Polat, A., Kerrich, R., and Wyman, D. The late Archean Schreiber-Hemlo and White River-Dayohessarah greenstone belts, Superior Province: Collages of oceanic plateaus, Oceanic island arcs, and subduction-accretion complexes.
		Archean greenstone belt volcanism and the continental growth-mantle evolution connection: Constraints from Th-U-Nb-LREE systematics of the 2.7 Ga Wawa Subprovince, Superior Province, Canada.
	www.mpch-mainz.mpg.de /~geo/polat/polat.html (1232 words)

	MacDonald Mines Exploration - Sachigo Greenstone Belt (Site not responding. Last check: 2007-08-19)
		The Attawapiskat greenstone belt is found towards the northern margin of the Archean Superior Province (as it occurs in Ontario), and is classified by the Ontario Geological Survey (OGS) as part of the Sachigo subprovince.
		The greenstone belt likely consists of sub-oceanic volcanics and sediments, as folded and faulted synclinoria, among complex gregarious granite-gneiss domes.
		This dome has magnetic characteristics (a “chopped” appearance) suggesting that it is “internal;” that is, it contained units that were likely the crustal substrate beneath the volcanic-sedimentary complex that ultimately became the greenstone belt, and may have acted as a common source for felsic volcanics in the greenstone sequence.
	www.macdonaldmines.com /main/properties/Sachigo%20Greenstone%20Belt (3283 words)

	Grandview Gold Inc • Properties • Bissett Gold Camp • Geology (Site not responding. Last check: 2007-08-19)
		The region is part of the great Superior Province, a terrane of large granitic masses separated by greenstone belts, which consist of rocks of volcanic and sedimentary origin.
		The greenstone belts contain two groups of supracrustal (volcanic and sedimentary) rocks, one older and one younger.
		The Rice Lake greenstone belt, in Manitoba, together with the Red Lake, Bee Lake, and Pickle Lake greenstone belts, in Ontario, form the Uchi subprovince.
	www.grandviewgold.com /properties/bissett-gold-geology.html (320 words)

	Archean Rocks (Site not responding. Last check: 2007-08-19)
		Greenstones are an assemblage of volcanic and volcanosedimentary units containing, from the base upwards: ultramafic volcanic rocks (komatiites), mafic, intermediate and finally felsic volcanic rocks, overlain by tuffaceous rocks and sediments.
		Greenstone belts are thought to be derived from back arc and/or forearc basins adjacent to volcanic arcs.
		Greenstone belts include massive volcanogenic sulfide deposits (MVS) which represent old mid ocean ridge or volcanic arc sites enriched in copper and lead sulfides.
	www.uwsp.edu /geo/faculty/hefferan/Geol106/CLASS3/archean_rocks.htm (142 words)

	Re: Oophiolites, blueschists, and greenstone belts by Alan Plante on 5/06/2002
		Re: Oophiolites, blueschists, and greenstone belts by Alan Plante on 5/06/2002
		Posted in response to Oophiolites, blueschists, and greenstone belts from Denise on April 28, 2002 at 23:15:14:
		"Greenstone" is a sort of generic field term for any "compact dark-green...
	www.rockhounds.com /rocknet/archive/messages/17985.shtml (368 words)

	Archean geology (Site not responding. Last check: 2007-08-19)
		The Wabigoon and Wawa subprovinces are volcanoplutonic belts that consist of deformed, relatively low-grade metavolcanic and metasedimentary rock sequences intruded by granitoid plutons.
		These data, together with subhorizontal structural style, high metamorphic grade, and a sparsity of supracrustal protoliths, suggest that the MRV terrane probably was a pre-existing continental fragment that was accreted to the margin of the Superior craton by northward-verging (directed) subduction at the end of late Archean continental growth.
		Based on the history of discoveries in Canada, the Archean greenstone belts of Minnesota are intrinsically prospective for diverse mineral-deposit types including shear-zone-hosted lode gold, iron-formation-hosted stratabound gold, volcanic-hosted base-metal sulfides (VMS), Ni-Cu-PGE-Cr deposits hosted by komatiitic volcanic sequences or associated sills, and Cu-Mo-Au deposits hosted by granitoid porphyry.
	www.geo.umn.edu /mgs/mnpot/archean.html (345 words)

	Dr. Igor Puchtel
		Puchtel, I.S., Zhuravlev, D.Z., Samsonov, A.V., and Arndt, N.T. Petrology and geochemistry of metamorphosed komatiites and basalts from the Tungurcha greenstone belt, Aldan Shield.
		Zhuravlev, D.Z., Puchtel, I.S., and Samsonov, A.V. Sm-Nd age and geochemistry of metavolcanics from the Olondo greenstone belt, Aldan Shield.
		Puchtel, I.S. and Simon, A.K. Precambrian ultramafic metavolcanics of greenstone belts.
	www.mpch-mainz.mpg.de /~geo/Noframes/puchtel/puchtel.html (1949 words)

	gsbelts
		The focus of the new research is on the geometry and architecture of the early sedimentary basins and the structural setting in relation to syn-sedimentary deformation.
		The Early Archean basins of the Duffer Subgroup in the Pilbara and of the Hooggenoeg Formation of the Barberton greenstone belt in South Africa have been selected for this study since they are of almost identical age (3.45- 3.47 Ga).
		However, until our recent studies in the Hooggenoeg Formation, a basic difference between the areas was the apparent absence of an extensional deformation phase in the Barberton Greenstone Belt at about 3450 Ma, associates with the upper Hooggenoeg felsic volcanics.
	web.uct.ac.za /depts/cigces/gsbelts.htm (1049 words)

	Search Results for greenstone-granite belt - Encyclopædia Britannica
		Archean rocks occur in greenstone–granite belt s that represent the upper crust, in granulite–gneiss belt s that formed in the mid-lower crust, and in sedimentary basins, basic dikes, and layered...
		Precambrian rocks were long ago defined to predate the Cambrian and therefore to predate all life, although the term Proterozoic was later coined from the Greek for “early life.” It is now known that...
		The granulites, gneisses, and associated rocks in these belt s were metamorphosed to a high grade in deep levels of the Archean crust; metamorphism occurred at a temperature of 750° to 980° C and at a...
	www.britannica.com /search?query=greenstone-granite+belt (552 words)

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