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THE ORE DATABASE
Occurence 5610 - 012 Suolomaras
(Object Id: 745)
(Last updated: 01.02.2007)
Location
County: Finnmark Municipality: Kárášjohka (5610)
Map 1:50000: Bæivasgiedde (2033-3) Map 1:250000: Karasjok
Coordinate system: EU89-UTM Zone 35
East: 416457 m. North: 7682456 m.
Longitude: 24.8878320 Latitude: 69.2390350
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Resource
Resource Type: Ferrous metals(Fe, Mn, Ti) Resource Subtype: Iron
Element(s): Fe
Importance
Raw material meaning: Little Importance (reg. 18.02.2015)

Resources and production
Activity: Exploration Reserves:
Operating method: Historical production:


Operations
From - To Activity Comments
1954 - 1957 Geophysics Company/Institution :Geofysisk malmleting
1954 - 1957 Geology Company/Institution :Geofysisk malmleting
1957 - 1957 Core drilling Company/Institution :Geofysisk malmleting
1967 - 1967 Geochemistry Company/Institution :Geological Survey of Norway
Contracted by A/S Sydvaranger.
1979 - 1980 Geophysics Company/Institution :Geological Survey of Norway
Ground surveys.
1980 - 1980 Core drilling Company/Institution :Geological Survey of Norway
2 drill holes.
1980 - 1981 Geophysics Company/Institution :Geological Survey of Norway
Helicopterborne. 470 km2, line spacing 250m.

Mineralization
Era: Proterozoic Period: Paleoproterozoic
Genesis: Chemical sediment Form: Layer
Main texture: Banded Min. distribution: Semi-massive (20-50 % ore minerals)
Main grain size: Fine grained (< 1 mm) Main alteration:
Strike/Dip: Direction:
Plunge:
Stratigraphic classification of host rock
Era: Proterozoic Period: Paleoproterozoic
Province: Troms-Finnmark Basement Province
Geotec.unit: Karasjok Greenstone Belt
Tectonic complex:
Igneous complex:
Group: Iddjajavri Formation: Bakkilvarri

Mineralogy
Relationship Mineral Amount
Gangue mineral Spessartine Major mineral (>10%)
Gangue mineral Grunerite Major mineral (>10%)
Gangue mineral Carbonate Major mineral (>10%)
Gangue mineral Quartz Major mineral (>10%)
Gangue mineral Graphite Subordinate mineral (1-10%)
Gangue mineral Muscovite Accessory mineral (<1%)
Gangue mineral Apatite Accessory mineral (<1%)
Ore mineral Magnetite Major mineral (>10%)
Ore mineral Hematite Major mineral (>10%)
Ore mineral Pyrrhotite Subordinate mineral (1-10%)
Ore mineral Cobalt pentlandite Accessory mineral (<1%)
Ore mineral Chalcopyrite Accessory mineral (<1%)

Lithology:
Relationship Rock Origin
Host rock Banded iron formation Sedimentary
Original rock :Exhalite
Wall rock Metakomatiite Extrusive
Original rock :Komatiite
2085 (-85\+85) mill. years;..Method:Sm/Nd
Metamorphic facies :Amphibolite
Wall rock Amphibolite Extrusive
Original rock :Basalt
Metamorphic facies :Amphibolite

Bibliography:
From NGU's Reference Archive:
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 pages
Abstract:
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.

Wennervirta, H.; Trøften, Per Fr.; Logn, Ø.; Brækken, H. , 1957
Geofysisk/geologisk undersøkelse Karasjok Jernmalmfelter.
;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.159;44 pages
Abstract:
Tidligere rapporter: GM Rapport nr. 114 over undersøkelsene i 1953 (udatert), GM Rapport nr. 137/Foreløpig 29/9-54 og GM Rapport nr. 137/Foreløpig 30/10-54 over undersøkelsene i 1954. Det henvises også til GM Rapport 159/Foreløpig 24/10-55 over undersøkelsene i 1955. Hensikten med undersøkelsene i 1955 var å føre de tidligere arbeidene videre. De geologiske undersøkelsene omfattet en systematisk kartlegging av den jernmalmførende formasjon. De geofysiske undersøkelsene hadde to formål: 1. Lokalisere nye malmforekomster ved ut- sstrakte magnetiske rekognoseringsmålinger. 2. Kartlegge nøyere de allerede kjente forekomster ved ulike geofysiske metoder. Foruten magnetiske målinger ble det forsøksvis utført gravimetriske målinger og selvpotensialmålinger. GM Rapport 159 er ganske omfattende og en skal ikke her gå nøyere inn på resultatene av undersøkelsene, men bare nevne de forekomster av jernmalm som hittil er funnet: Guoikkevarre (tidligere Suolomaras II), Soulamaras (tid- ligere Suolomaras I), Njuovcokka, Gæssegielas. Forøvrig henvises til H. Wennervirta's beskrivelse av Karasjoksområdets geologi i NGU-publikasjon nr. 258 (Årbok 1968).

Wennervirta, Heikki , 1968
Karasjokområdets geologi.
;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.258;131-184 pages
Abstract:
Precambrian meta-sediments and igneous rocks from the Karasjok Region, Finnmark, Norway are petrographically described. Brief description of structures and a comparison with other areas are also presented.

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 pages
Abstract:
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

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