Fact Sheet for <b>Occurence 1836 - 312 Nord-Værnes</b>

					Norsk versjon
	THE INDUSTRIAL MINERAL DATABASE
	Occurence 1836 - 312 Nord-Værnes
	(Object Id: 8968) (Last updated: 10.01.2022)

Location

County:

Nordland

Municipality:

Rødøy (1836)

Map 1:50000:

Melfjorden (1928-3)

Map 1:250000:

Mo i Rana

Coordinate system:

EU89-UTM Zone 33

East:

422599 m.

North:

7394550 m.

Longitude:

13.2491100

Latitude:

66.6598690

Show on map

Resource

Resource Type:

Olivine

Resource Subtype:

Olivine

Importance

Raw material meaning:

Not Assessed (reg. 07.12.2015)

Resources and production

	Activity:	Exploration	Reserves:
	Operating method:		Historical production:

Products

Element/product Crude ore grade or quality Reg. date

Refractories 100% 13.02.2004

Slag conditioner 100% 13.02.2004

Operations

From - To Activity Comments

1996 - 1996 Sampling Company/Institution :NGU

Mineralization

Era: Proterozoic Period:

Genesis: Liquid magmatic Form: Lens

Main texture: Granoblastic Min. distribution: Irregular (scattered)

Main grain size: Coarse grained (> 3 mm)

Strike/Dip: Direction:

Plunge:

Stratigraphic classification of host rock

Era: Proterozoic Period:

Province: Caledonides

Geotec.unit:

Tectonic complex:

Igneous complex:

Group: Formation:

Mineralogy

Mineral Amount

Olivine Major mineral (>10%)

Enstatite Major mineral (>10%)

Serpentine Major mineral (>10%)

Magnetite Subordinate mineral (1-10%)

Spinel Subordinate mineral (1-10%)

Talc Accessory mineral (<1%)

Information(s) in free text format

Free text

Forekomsten ligger noen hundre meter syd for tettstedet Nord-Værnes. Her har vi en ca. 1,3 km lang og 350 m bred inhomogen ultramfisk bergart. En indre kjerne består av en delvis serpentinisert dunitt og en ytre randsone består av en hartzburgittisk bergart med svært grovkrystallinsk sammenvoksing som danner en såkalt jack-straw tekstur. To ultramafiske linser på 300x500 m og 200x300 m. Består av harzburgitt (enstatitt + olivin), dunitt (olivinstein) og serpentinitter. Dunitter utgjør anslagsvis 20-30 % av massivet. Dunittene består av opptil 90 % olivin, men det er usikkert hvor mye av denne som er serpentinisert. Deler av den er sterkt serpentinisert. Dunittene har en impregnasjon av spinell på 2-4 % (kromitt med høyt jerninnhold). Enkelte bånd på opptil 20 cm av spinell har ført til røskinger flere plasser i massivet. S. Olerud -94.

Photo(s) from the Deposit area:

Photo no. 1 showing Oversikts bilde"

Photo no. 2 showing Nærbilde av Jack Straw tekstur"

Photo no. 3 showing Prøvelokalitet"

Bibliography:

From NGU's Reference Archive:

Gautneb, Håvard , 1997

Resultater fra regionale olivin- og serpentinundersøkelser i Norge 1996

;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.97.043;60 pages

Gautneb, Håvard , 1996

Oversikt over olivin- og serpentinittforekomster, registrert ved NGU

;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.96.077;65 pages

Abstract:

Denne rapporten gir en oversikt over Norges olivin- og serpentinittforekomster samt en oversikt over NGUs tilhørende informasjon. Ved NGU er det registrert 70 olivin- og 80 serpentinittforekomster. Forekomstene er delt inn i følgende grupper 1) forekomster innenfor grunnfjellsområdene 2) forekomster innenfor den kaledonske fjellkjede. Sisnevnte er igjen delt i følgende grupper a) ultramafiske lag og linser b) høytemperatur ultramafiske intrusjoner c) ultramafiske xenolitter d) de såkalte "alpin-type" ultramafitter e) klast- iske serpentinitter. De aller fleste forekomstene tilhører gruppen av alpin- type ultramafitter, som nesten utelukkende omfatter ultramafitter som opprin- nelig har vært en del av ofiolitter. Rapporten gir en kort beskrivelse av de forekomstene som har data registrert ved NGU. I enkelte tilfeller er også detaljopplysninger presentert.

Bakke, Stig; Korneliussen, Are , 1986

Jack-straw-textured olivines in some Norwegian metaperidotites.

;Norsk geologisk forening;TIDSSKRIFTARTIKKEL;Norsk geologisk tidsskrift; No.66 (4);271-276 pages

Abstract:

Jack-straw-textured olivines, which are elongate olivines of metamorphic origin, occur in complexly metamorphosed ultramafites within the Norwegian Caledonides. The ultramafic bodies are lenses enclosed within high-grade mica-shists or gneisses. In generally they consist of a dunitic core sur- rounded by massive olivine orthopyroxenite with a mantle of jack-straw-textured olivines in contact with the country rocks. The jack-straw olivines are elongate, radomly orientated platy crystals from 3 cm to 1 m long. They lie in a matrix of orthopyroxene, carbonate and minor tremolite. Field relations between various rock-types, including jack-straw textured olivine + carbonate + talc +/ bronzite veins, are well exposed at the Nordvernes ultramafic body, North Helgeland.

Karlsen, Tor Arne ; Gautneb, Håvard ; Lund, Bjørn , 1999

Status-report on talc-prospecting in Helgeland, northern Norway.

;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.99.068;? pages

Abstract:

A prospecting programme for talc has been carried out in Helgeland. The results are both good and bad; a new talc deposit has been found in Kvanndalen, a few km west of Altermark. The deposit are exposed, and the size is not yet known, except that the maximum width is around 50 metres. To be able to use th ore, there must either be a market for the assemblage talc-breunnerit-olivine, or it must be possible to remove the olivine. A further deposit of interest occurs in Misvær. Otherwise, talc is rather uncommon in the numerous ultramafic lenses around the Høgtuva-, Sjona- and Svartisen windows. The ultramafic lenses are dominated by the metamorphic assemblage enstatite-anthophyllite-carbonate with or without olivine. It is concluded that the metamorphic grade has, in general, been too high in the western area and that possible pre-existing talc-carbonate assemblages have been altered to the minerals above. The deposit in Kvanndalen probably represent the margin of what can be termed the Altermark Talc Province. Only olivine has been included in the talc-carbonate assemblage, while bodies further to the west carry olivine, enstatite and anthophyllite.

Fieldsamples

Sample No. Sample type Miscellanrous

NGUAK96042 Bedrock

Comment: This is a dummy sample that does not excists. The assosciated analyses have been compiled from various published and unpublished reports

No. of registrated oxide analyses = 1

NGUAK96043 Bedrock

Comment: This is a dummy sample that does not excists. The assosciated analyses have been compiled from various published and unpublished reports

No. of registrated oxide analyses = 1

NGUAK96044 Bedrock

Comment: This is a dummy sample that does not excists. The assosciated analyses have been compiled from various published and unpublished reports

No. of registrated oxide analyses = 1

NGUAK96045 Bedrock

Comment: This is a dummy sample that does not excists. The assosciated analyses have been compiled from various published and unpublished reports

No. of registrated oxide analyses = 1

NGUAK96046 Bedrock

Comment: This is a dummy sample that does not excists. The assosciated analyses have been compiled from various published and unpublished reports

No. of registrated oxide analyses = 1

NGUAK96047 Bedrock

Comment: This is a dummy sample that does not excists. The assosciated analyses have been compiled from various published and unpublished reports

No. of registrated oxide analyses = 1

NGUAK96048 Bedrock

Comment: This is a dummy sample that does not excists. The assosciated analyses have been compiled from various published and unpublished reports

No. of registrated oxide analyses = 1

NGUAK96049 Bedrock

Comment: This is a dummy sample that does not excists. The assosciated analyses have been compiled from various published and unpublished reports

No. of registrated oxide analyses = 1

NGUAK96050 Bedrock

Comment: This is a dummy sample that does not excists. The assosciated analyses have been compiled from various published and unpublished reports

No. of registrated oxide analyses = 1

NGUAK96051 Bedrock

Comment: This is a dummy sample that does not excists. The assosciated analyses have been compiled from various published and unpublished reports

No. of registrated oxide analyses = 1

NGUAK96052 Bedrock

Comment: This is a dummy sample that does not excists. The assosciated analyses have been compiled from various published and unpublished reports

No. of registrated oxide analyses = 1

NGUHG96049 Bedrock

Comment: This is a dummy sample that does not excists. The assosciated analyses have been compiled from various published and unpublished reports

No. of registrated oxide analyses = 1

NGUHG96050 Bedrock

Comment: This is a dummy sample that does not excists. The assosciated analyses have been compiled from various published and unpublished reports

No. of registrated oxide analyses = 1

NGUHG96051 Bedrock

Comment: This is a dummy sample that does not excists. The assosciated analyses have been compiled from various published and unpublished reports

No. of registrated oxide analyses = 1

NGUHG96052 Bedrock

Comment: This is a dummy sample that does not excists. The assosciated analyses have been compiled from various published and unpublished reports

No. of registrated oxide analyses = 1

NB! All analyse values are shown at the end of the printout.:

Analyse Results

from

Deposit Area 1836 - 312 Nord-Værnes

Oxide analyses
( All values are in % )

Sample No. Sample Type SiO2 Al2O3 TiO2 Fe2O3 MnO MgO CaO

NGUAK96042 Bedrock 46.30 0.38 0.00 8.40 0.13 40.70 0.78

NGUAK96043 Bedrock 42.60 0.45 0.00 9.30 0.16 46.30 0.07

NGUAK96044 Bedrock 42.40 0.34 0.00 9.70 0.10 46.70 0.05

NGUAK96045 Bedrock 46.10 3.34 0.00 6.80 0.06 41.60 0.07

NGUAK96046 Bedrock 43.00 0.43 0.00 8.70 0.10 46.80 0.04

NGUAK96047 Bedrock 41.60 0.36 0.00 10.30 0.13 46.20 0.05

NGUAK96048 Bedrock 41.70 0.35 0.00 10.30 0.14 47.00 0.11

NGUAK96049 Bedrock 50.70 0.40 0.00 8.20 0.12 38.40 0.25

NGUAK96050 Bedrock 48.20 0.34 0.00 8.30 0.11 40.40 0.15

NGUAK96051 Bedrock 23.00 3.20 0.00 25.00 0.30 30.00 0.04

NGUAK96052 Bedrock 43.50 0.45 0.00 8.90 0.09 46.30 0.07

NGUHG96049 Bedrock 41.90 0.27 0.00 8.60 0.12 48.20 0.12

NGUHG96050 Bedrock 41.80 0.39 0.00 9.00 0.13 47.40 0.09

NGUHG96051 Bedrock 40.90 0.35 0.00 7.70 0.11 44.70 0.06

NGUHG96052 Bedrock 41.00 0.21 0.00 7.90 0.14 50.00 0.12

------------------

Sample No. Na2O K2O P2O5 Loss Sum

NGUAK96042 0.01 0.01 0.00 2.74 99.00

NGUAK96043 0.00 0.00 0.00 0.96 100.00

NGUAK96044 0.00 0.00 0.00 0.51 100.00

NGUAK96045 0.00 0.00 0.00 2.02 100.00

NGUAK96046 0.00 0.00 0.00 0.60 100.00

NGUAK96047 0.00 0.00 0.00 1.16 100.00

NGUAK96048 0.01 0.00 0.00 0.31 100.00

NGUAK96049 0.00 0.00 0.00 0.56 99.00

NGUAK96050 0.00 0.00 0.00 2.18 100.00

NGUAK96051 0.08 0.00 0.00 0.55 82.00

NGUAK96052 0.00 0.00 0.00 0.22 100.00

NGUHG96049 0.02 0.00 0.00 0.28 100.00

NGUHG96050 0.02 0.00 0.00 0.57 99.00

NGUHG96051 0.00 0.00 0.00 5.78 100.00

NGUHG96052 0.00 0.00 0.00 0.53 100.00

Element/product	Crude ore grade or quality	Reg. date
Refractories	100%	13.02.2004
Slag conditioner	100%	13.02.2004

	From - To	Activity	Comments
	1996 - 1996	Sampling	Company/Institution :NGU

Era:	Proterozoic	Period:
Genesis:	Liquid magmatic	Form:	Lens
Main texture:	Granoblastic	Min. distribution:	Irregular (scattered)

	Province:	Caledonides
	Geotec.unit:
	Tectonic complex:
	Igneous complex:

	Mineral	Amount
	Olivine	Major mineral (>10%)
	Enstatite	Major mineral (>10%)
	Serpentine	Major mineral (>10%)
	Magnetite	Subordinate mineral (1-10%)
	Spinel	Subordinate mineral (1-10%)
	Talc	Accessory mineral (<1%)

Sample No.	Sample Type	SiO2	Al2O3	TiO2	Fe2O3	MnO	MgO	CaO
NGUAK96042	Bedrock	46.30	0.38	0.00	8.40	0.13	40.70	0.78
NGUAK96043	Bedrock	42.60	0.45	0.00	9.30	0.16	46.30	0.07
NGUAK96044	Bedrock	42.40	0.34	0.00	9.70	0.10	46.70	0.05
NGUAK96045	Bedrock	46.10	3.34	0.00	6.80	0.06	41.60	0.07
NGUAK96046	Bedrock	43.00	0.43	0.00	8.70	0.10	46.80	0.04
NGUAK96047	Bedrock	41.60	0.36	0.00	10.30	0.13	46.20	0.05
NGUAK96048	Bedrock	41.70	0.35	0.00	10.30	0.14	47.00	0.11
NGUAK96049	Bedrock	50.70	0.40	0.00	8.20	0.12	38.40	0.25
NGUAK96050	Bedrock	48.20	0.34	0.00	8.30	0.11	40.40	0.15
NGUAK96051	Bedrock	23.00	3.20	0.00	25.00	0.30	30.00	0.04
NGUAK96052	Bedrock	43.50	0.45	0.00	8.90	0.09	46.30	0.07
NGUHG96049	Bedrock	41.90	0.27	0.00	8.60	0.12	48.20	0.12
NGUHG96050	Bedrock	41.80	0.39	0.00	9.00	0.13	47.40	0.09
NGUHG96051	Bedrock	40.90	0.35	0.00	7.70	0.11	44.70	0.06
NGUHG96052	Bedrock	41.00	0.21	0.00	7.90	0.14	50.00	0.12

Sample No.	Na2O	K2O	P2O5	Loss	Sum
NGUAK96042	0.01	0.01	0.00	2.74	99.00
NGUAK96043	0.00	0.00	0.00	0.96	100.00
NGUAK96044	0.00	0.00	0.00	0.51	100.00
NGUAK96045	0.00	0.00	0.00	2.02	100.00
NGUAK96046	0.00	0.00	0.00	0.60	100.00
NGUAK96047	0.00	0.00	0.00	1.16	100.00
NGUAK96048	0.01	0.00	0.00	0.31	100.00
NGUAK96049	0.00	0.00	0.00	0.56	99.00
NGUAK96050	0.00	0.00	0.00	2.18	100.00
NGUAK96051	0.08	0.00	0.00	0.55	82.00
NGUAK96052	0.00	0.00	0.00	0.22	100.00
NGUHG96049	0.02	0.00	0.00	0.28	100.00
NGUHG96050	0.02	0.00	0.00	0.57	99.00
NGUHG96051	0.00	0.00	0.00	5.78	100.00
NGUHG96052	0.00	0.00	0.00	0.53	100.00