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	INDUSTRIMINERALDATABASEN
	Registrering 5610 - 304 Anarjokka
	(Objekt Id: 14926) (Sist oppdatert: 24.02.2004)

Mineralisering

	Genese:		Form:
	Hovedtekstur:		Min. fordeling:

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	Strøk/Fall:		Retning:
			Feltstupning:

Stratigrafisk klassifikasjon av vertsbergart

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Periode:

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	Geotek.enhet:
	Tektonisk complex:
	Intrusivt komplex:

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Litteraturfortegnelser:

Fra NGU's Referansearkiv.:

Krill, A.G.; Often, M. , 1986

	Galmatskai'di. Berggrunnskart; Galmatskai'di; 20332; 1:50 000; sort/hvitt;

;Norges geologiske undersøkelse;KART

Siedlecka, Anna; Roberts, David , 1996

	Finnmark fylke. Berggrunnsgeologi Finnmark fylke M 1:500 000; trykt i farger

;Norges geologiske undersøkelse;KART

	Abstrakt:
	Beskrivelsen finnes på kartet.

Midtun, Reidar D. , 1986

	Geofysisk og geologisk tolkning av regionale strukturer innenfor kartbladene Karasjok, Galmatskai'di, Bæivasgieddi og Iesjåkka, Karasjok kommune, Finnmark.

;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.86.209;63 sider

Abstrakt:

Datagrunnlaget for denne tolkninga har vært: 1) Geologiske blotningskart samt en tektonostratigrafisk tolkning av disse, 2) Petrofysikk: 6000 in-situ susceptibilitetsmålinger, 1200 bergartsprøver målt på susceptibilitet, tetthet og remanens, 3) Magnetiske og elektromagnetiske helikoptermålinger og 4) Gravimetriske bakkemålinger. Den aeromagnetiske tolkning har resultert i et magnetisk strukturkart inneholdende informasjon om magnetiseringsmønster/nivå, kontakter, bånd, ganger og fallangivelser basert på modellberegninger. En tolkning av magnetiske dislokasjoner er foretatt. Dislokasjonskartet viser 4 hovedretninger 50 - 60 grader, 350 - 360 grader, 80 - 100 grader og 10 - 20 grader hvor de to førstnevnte er de viktigste. Detaljert gravimetrisk tolkning er gjort langs 4 profiler. Modelleringa gir et godt bilde av grønnsteinsbeltets varierende mektighet. Maksimum dyp til basement er modellert til 4 km. En 3-dimensjonal strukturanalyse basert på en kombinasjon av magnetisk- og gravimetrisk tolkning har klarlagt flere regionale strukturer. Et kart over foldestrukturer har vært et resultat av dette. Kartet viser akseplan i to hovedretninger N-S og ØSØ-VNV. Tolkningsmetoden beskrevet i rapporten anses som et meget godt redskap for å klarlegge regionale geologiske strukturer. Dersom tolkningsarbeidet blir involvert i et tidligere stadium av den regionale berggrunnskartlegging, vil metoden effektivisere kartleggingen betraktelig.

Midtun, Reidar Devold , 1988

	Karasjokgrønnsteinbeltet. Regional geofysisk og geologisk tolkning

;Norges geologiske undersøkelse;BOK;Skrifter; No.88;19 sider

Abstrakt:

A geophysical interpretation of geological structures within 5 map-sheets in 1:50,000 scale (AMS M711) has been done. Petrophysical properties of 1350 rock samples and about 11000 in situ susceptibility measurements have been analyzed. The interpretation is based on all available information including geological and petrophysical data, low altitude magnetic and electromagnetic measurements and gravimetric data. The aeromagnetic interpretation includes a magnetic structure map showing patterns, contacts, magnetization levels and dip estimations. From this map the outcropping of the tectonostratigraphic units and the internal layering can be seen. An interpretation of magnetic dislocations together with a topografic lineament study has been made, revealing 3 directions of dislocation maxima, NE, E and NV. The Ne-direction is thought to be the youngest. Thrusts are also detected from the magnetic data. Detailed gravimetric interpretations have been made along 5 profiles. These model calculation show alternating culmination and depressions with a maximum depth to basement being 4 km. By combining the magnetic and gravimetric interpretation . The map shows two foldsystems, NNe and ESE. The oldest NNE-system is thought to be connected with suturing in this area. These two interfering fold systems are producing 4-5 km deep synclinorias separated by shallow basement-ridges within the Karasjok Greenstone Belt. A regional gravimetric model calculation crossing the Precambrian terrain of the Northern Fennoscandia has been made. This interpretation supports the theory of a suture between the Karasjok Greenstone Belt and Levajok Granulite Belt.

Krill, Allan G. , 1985

	Svekokarelian thrusting with thermal inversion in the Karasjok-Levajok area of the northern Baltic Shield

;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU Bulletin; No.403;89-101 sider

Abstrakt:

Recent mapping, isotopic dating, and metamorphic and structural observations from the Karasjok-Levajok are, lead to a tectonic interpretation that is similar in many ways to Phanerozoic plate tectonic models. Three major belts of Early Proterozoic rocks lie between two Archean gneiss complexes: the Jer'gul Gneiss Complex on the west and the Baisvarri Gneiss Complex on the east. The E-dipping Early Proterozoic belts are, from west to east: the Karasjok Greenstone Belt, the Tanaelv Migmatite Belt, and the Levajok Granulite Belt. Earlier geochemical studies suggested that the Tanaelv Migmatite Belt consists mainly of tholeiitic metavolcanites of an outer volcanic are, and that the Levajok Granulite Belt represents geosynclinal metasediments intruded by calc-alkaline rocks of an inner magmatic arc. It is suggested here that basaltic rocks related to the Karasjok Greenstone Belt were subducted eastward, generating the arc magmatism, and contributing heat and CO2 to produce the granulite-facies metamorphism. During later stages of the Svecokarelian event, thrusts developed parallel to the subduction zone. The granulites were thrust westward over the migmaties, which were in turn thrust also developed within and beneath the Karasjok Greenstone Belt. Thrusting of the granulite belt occurred at granulite-facies conditions and the heat from these rocks contributed to an inverted regional metamorphic gradient within the underlying Tanaelv Migmatite Belt and Karasjok Greenstone Belt. The metamorphic grade within the Karasjok Greenstone Belt increases from low grade in the western, deepest parts, to medium grade and migmatitic high grade upward, near the overlying Tanaelv Migmatites. Kyanite-bearing rocks in the deeper parts of the Karasjok Greenstone Belt contrast with sillimanite-bearing rocks in the shallower parts, and demonstrate that the metamorphism was in-situ, and n

Often, Morten , 1985

	The Early Proterozoic Karasjok Greenstone Belt, Norway. A preliminary description of lithology, stratigraphy and mineralization.

;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU Bulletin; No.403;75-88 sider

Abstrakt:

The Karasjok Greenstone Belt of Finnmark, Norway, is a sequence of medium-grade metmorphic supracrustal rocks in the northernmost part of the Baltic Shield. Regional mapping has revealed a tectonostratigraphy with the greenstone belt resting on Archaean sialic basement, dipping away under the Tanaelv Migmatic Complex with the Levajok Granulite Complex on top. Major thrust zones separate the lowermost part of the greenstone belt, the clastic Skuvvanvarri Formation, from the mixed volcanic-sedimentary Iddjajav'ri Group. High grade thrust zones also separate the migmatic and granulitic complexes feom the greenstone belt. Pyroclastic komatiites constitute an important part of the Issjaja'ri Group, suggesting volcanism in a shallow-water environment. A plate-tectonic concept is applied to describe the evolution of the greenstone belt which is probably of Earth to Middle Proterozoic age. Mineralizations within the Karasjok Green- stone Belt are classified and briefly described. Thw two most important types are manganiferous banded iron-formations of Algoma type and large low-grade disseminated copper-gold mineralizations of uncertain origin.

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