Fact Sheet for Deposit Area 1943

					Norsk versjon
	THE INDUSTRIAL MINERAL DATABASE
	Deposit Area 1943 - 310
	(Last updated 20.sep.2017)

Name of Deposit Area : Reinfjorden

(Object Id : 1943,310,00,00)

Location

County :

Troms (19)

Municipality :

Kvænangen (1943)

Map 1:50000:

Øksfjordjøkulen (1735-2)

Map 1:250000:

Nordreisa

Marking point:

Longitude:

21.6834690

Latitude:

70.1146270

EU89-UTM Zone 34

(Coordinates IS confirmed)

X-coord:

525945 m.

Y-coord:

7778801 m.

Commodity

Main Type:

Olivine

Sub Type:

Olivine

Production

Activity:	Exploration	Reserves:
Prod. method:		Production:
Prod. status:		Volume of dump:

Importance

Public: Not Assessed (reg. 21.09.2017)

Economical: Significant , (Confirmed 03.jun.2006 by Are Korneliussen)

Mineralization

Era: Paleozoic Period:

Dating: Method:

Genesis: Form:

Main texture: Min. distribution:

Main grain size:

Strike/Dip: Direction:

Plunge:

Stratigraphic classification of host rock

Era: Period:

Province: Caledonides

Geotec.unit: Kalak Nappe Complex

Tectonic complex:

Igneous complex:

Group: Formation:

Information(s) in free text format

Free text

Reinfjord ultramafiske kompleks er en minimum 3 x 7 km stor lagdelt intrusjon (den nordligste delen av intrusjonen stikker som nevnt inn under isbreen og intrusjonen kan derfor være en del større enn her angitt). Kraftig topografisk relieff. Den nordligste delen stikker inn under isbreen Langfjordjøkelen. Forekomsten ligger imidlertid bare 3 km i luftlinje fra havet (Reinfjorden som er en liten sidefjord til Kvænangen og godt beskyttet for nordlige og vestlige vinder). Forekomsten kan ha et betydelig potensiale for olivin (beskrives som "an extensive outcrop of dunite and subsidiary poikilitic wehrlite") og bør derfor studeres nærmere! Det er imidlertid relativt mye jern tilstede i denne olivinen i forhold til olivinen i kaledonske ofiolittiske dunitter. Innenfor den såkalte "Central Series" (den stratigrafisk øverste enheten) opptrer dunitt som hovedbergarten sammen med underordnede mengder poikilittisk wehrlitt. Olivin var den eneste kumulusfasen under krystallisasjonen av denne serien. Videre opptrer dunitt innenfor den såkalte "North East Marginal Zone" (Bennet et al. 1986, side 25-26). Dunitten i "Central Series" har en olivin som varierer i sammensetning fra Fo 86 til Fo 84. Analysert olivin i bergartene i Northeast Marginal Zone fører olivin som varierer i sammensetning fra Fo 78 til Fo 84 (Bennet et al. 1986). Forekomsten har de siste årene blitt undersøkt av Nordic Mining for PGE, og det er funnet interessant gehalter i borkjerner.

Bibliography:

From NGU's Reference Archive:

Bennett, M.C. , 1971

The Reinfjord ultramafic complex. (Extended abstract)

;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.269;165-171 pages

Bennett, M.C.; Emblin, S.R.; Robins, B.; Yeo, W.J.A. , 1986

High-temperature ultramafic complexes in the North Norwegian Caledonides: I - Regional setting and field relationships.

;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU Bulletin; No.405;1-40 pages

Abstract:

Forkortet. Four major (25-100 km²) ultramafic complexes were developed in the Sørøy Nappe during the second phase of Finnmarkian deformation in the North Norwegian Caledonides. They were emplaced into layered mafic intrusions and show broadly similar emplacement histories and petrographic variations suggesting a related petrogenesis. The Nordre Bumannsfjord, Melkvann and Kvafjord group of ultramafic complexes developed in part by emplacement of both replacive and dilational ne-normative ultramafic sheets and dykes which progressively fragmented the layered olivine gabbro envelope. The Reinfjord ultramafic complex contains pronounced, subhorizontal modal layering and evidence of at least 3 major magmatic events. The intrusive sequences and petrographic variations represented in the complexes suggest the succesive emplacement of mantle-derived magmas with a diminishing number of liquidus phases, accompanied by in situ liquid-crystal fractionation, subsidiary hybridization and metasomatism.

Sturt, Brian A.; Speedyman, D.L.; Griffin, W.L. , 1980

The Nordre Bumandsfjord Ultramafic Pluton, Seiland, North Norway. Part I: Field relations.

;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.358;1 - 30 pages

Abstract:

The Nordre Bumandsfjord pluton consists of dunite, wehrlite and lherzolite. These rocks were intruded as magmas late in the Finnmarkian phase of the Caledonian orogeny. Field relations nad geochemistry show that the dominant primary magma was dunitic with ca. 40 wt % MgO; other ultramafic magma(s) was a final stage in the evolution of the very active mantle diapir responsible for the large volume of basic rocks comprising the Seiland Igneous Province.

Era:	Paleozoic	Period:
Dating:		Method:
Genesis:		Form:
Main texture:		Min. distribution:

	Province:	Caledonides
	Geotec.unit:	Kalak Nappe Complex
	Tectonic complex:
	Igneous complex: