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Deposit 4647 - 003 Naustdal
(Object Id: 12378)
(Last updated: 22.02.2017)

Location
County: Vestland Municipality: Sunnfjord (4647)
Map 1:50000: Dale (1117-1) Map 1:250000: Florø (tidl. Måløy)
Coordinate system: EU89-UTM Zone 32
East: 326400 m. North: 6824599 m.
Longitude: 5.7362760 Latitude: 61.5158960
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Resource
Resource Type: Ferrous metals(Fe, Mn, Ti) Resource Subtype: Titanium
Element(s): Ti Rutile
Importance
Raw material meaning: Regional Importance (reg. 27.05.2015)

Resources and production
Activity: Exploration Reserves: 100000 thousand tons
Operating method: Historical production:


Products
Element/product Crude ore grade or quality Reg. date
TiO2 3 % 28.09.2001

Operations
From - To Activity Comments
1975 - 1975 Sampling Company/Institution :Elkem A/S

Mineralization
Era: Paleozoic Period: Devonian
Genesis: Metamorphic formation Form: Lens
Main texture: Foliated Min. distribution: Disseminated (<20 % ore minerals)
Main grain size: Fine grained (< 1 mm) Main alteration: Amphibolisation
Strike/Dip: 260 / 70 Direction:
Plunge:
Ti-deposit type(s)
Main type: Metamorphic Ilm/Mt-ratio:
Sub type: Rutile in eclogite %TiO(Ore):
Titanium province: Sunnfjord %P2O5(Ore):
Host rock: Eclogite %MgO(Ilm):
Main Ti mineral: Rutile %V2O3(Mt):
ppm U (Rutile):
Stratigraphic classification of host rock
Era: Proterozoic Period: Mesoproterozoic
Province: Caledonian Basement Province
Geotec.unit: Western Gneiss Region
Tectonic complex: Helle Complex
Igneous complex:
Group: Formation:

Mineralogy
Relationship Mineral Amount
Gangue mineral Pyroxene Major mineral (>10%)
Gangue mineral Amphibole Major mineral (>10%)
Gangue mineral Garnet Major mineral (>10%)
Gangue mineral Quartz Subordinate mineral (1-10%)
Ore mineral Rutile Subordinate mineral (1-10%)
Ore mineral Pyrite Accessory mineral (<1%)

Lithology:
Relationship Rock Origin
Host rock Eclogite Intrusive
Original rock :Gabbro
Metamorphic facies :Eclogite
Wall rock Granitic gneiss Intrusive
Original rock :Granite
Metamorphic facies :Amphibolite

Information(s) in free text format
Free text
The Naustdal rutile deposit is a 2.5 km long eclogite hill extending eastwards from the river Nausta. The deposit was first mentioned by Eskola (1921), and then described by Binns (1967) and Krogh (1980). The deposit is, in terms of mineralogy and rutile grade (> 3% rutile), roughly similar to Engebøfjellet (N0189). Based on interpretations of gravimetry, the depoit may contain more than 100 mill.t. of eclogite with more than 3% rutile.

Bibliography:
From NGU's Reference Archive:
Korneliussen, Are , 1980
Jern- og titan-forekomster tilknyttet gabbroide, amfibolittiske og eklogittiske bergarter i Sunnfjord, Sogn og Fjordane.
;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.1717/3;39 pages
Abstract:
I forbindelse med gabbroide, granat-amfibolittiske og eklogitt-amfibolittiske bergarter innen prekambriske kvarts-feltspatiske gneiser i Sunnfjord, opptrer forekomster av magnetitt/ilmenitt og rutil/ilmenitt. Magnetitt (V-holdig)/ilmenitt opptrer som disseminasjon i gabbro, og som disseminasjon og massivmalm i klorittiserte partier i granat- og eklogitt- amfibolitt. De respektive forekomster er enten små eller lavgehaltige og vurderes som mindre lovende. Rutil opptrer som disseminasjon sammen med ilmenitt i granat- og eklogitt- amfibolitt og er et økonomisk sett adskillig mer attraktivt mineral. Det er påvist forekomster av betydelig størrelse, men med forholdsvis lave gjennom- snittsgehalter (2-3% TiO2, hovedsakelig som rutil). Enkelte partier innen disse forekomster inneholder imidlertid rutilgehalter av økonomisk interessant størrelsesorden (minst 4-5% rutil), men de korresponderende forekomststørr- elser og gjennomsnittsgehalter er ukjent. Det gjenstår å foreta en detaljert prøvetaking og vurdering av de mest interessante mineraliseringer.

Korneliussen, Are , 1978
Rutil i eklogitter, Sunnfjord.
;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.1717/1;24 pages
Abstract:
Som ledd i et samarbeide mellom NGU og Elkem Spigerverket om undersøkelser av jern- og titan-forekomster på Vestlandet ble det sommeren 1978 utført endel rekognoserende undersøkelser med henblikk på rutilforekomster i Sunn- fjord. De aktuelle områder består av prekambriske gneiser med innslag av gabbroide, amfibolittiske, eklogittiske, ultramafiske og granittiske berg- arter. Rutilforekomstene er tilknyttet eklogitt og granat-amfibolitt. Enkelte av de rutilførende bergartskropper og -soner er i km-størrelse. Analyser viser at økonomisk interessante titangehalter forekommer (over 5% TiO2) og forekomst-typen vurderes av den grunn som lovende.

Korneliussen, Are , 1980
Tunge bergarter, Sunnfjord.
;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.1717/2;7 pages
Abstract:
Forholdsvis tunge eklogitt-amfibolittiske og granat-amfibolittiske bergarter (sp.v. 3.2-3.6) i Sunnfjord kan tenkes anvendt til formål hvor det kreves høy egenvekt for råstoffmaterialet, f.eks. som ballastmateriale og til havnebyggingsformål. Denne rapport gir en generell oversikt over enkelte forekomster av slike bergarter ved Førdefjorden og Dalsfjorden. Egenvekt i forhold til bergartstype og forekomstlokalitet framgår. Vurder- inger av homogenitet og brytningstekniske forhold er ikke utført.

Korneliussen, Are , 1982
Rutil i eklogittiske bergarter i Sunnfjord.
;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.1717/5;32 pages
Abstract:
Sommeren 1980 ble det foretatt detaljprøvetaking av rutilførende eklogitter ved Kvammen, Fureviknipa, Engebøfjellet og Solvik. Økonomisk interessante rutilgehalter på 5-6% er kun påvist i dm - m store partier. Rutilanrikende partier i 100 m-størrelse inneholder i Fureviknipa og Engebøfjellet gjennomsnittsgehalter på inntil 3-3,5% rutil, mens Kvammen og Solvik er noe fattigere. Det er utført orienterende oppredningsforsøk på prøvemateriale fra Engebø- fjellet uten at det har lyktes å framstille et rutilkonsentrat. Sunnfjords eklogitter representerer betydelige rutilreserver men er i dagens situasjon for lavgehaltige til at videre prospekterings- og opprednings- undersøkelser bør utføres.

Korneliussen, Are ; McLimans, Roger ; Braathen, Alvar ; Erambert, Muriel ; Lutro, Ole ; Ragnhildstveit, Jomar , 2000
Rutile in eclogites as a mineral resource in the Sunnfjord Region, Western Norway.
;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU Bulletin; No.436;39-47 pages
Abstract:
The world's resources of the primary titanium raw materials ilmenite and rutile are very large. However, there is a lack of high-grade, high-quality ilmenite deposits as well as good rutile deposits. Particular focus has been given to rutilebearing eclogites in the Sunnfjord region of western Norway, due to a combination of factors such as high rutile content over significant volumes of rock and favourable rutile grainsize. Eclogites in the Sunnfjord region are found in a number of elongated lenses up to 3-4 km long, surrounded by gneisses of amphibolitic to granite composition, as well as numerous smaller eclogite bodies and eclogitised mafic layers in gneisses. The eclogites originated by high-pressure and temperature alteration of Proterozoic, Fe-Ti rich, gabbroic rocks, and were strongly deformed under eclogite-facies netamorphism and thereafter variably affected by retrograde processes. Eclogites in which conversation of ilmenite to rutle was complete and in which this mineral assemblage was negligibly affected by subsequent retrograde processes, are those of greatest economic potential. An example of such an eclogite is the Engebøfjellet eclogite on the north side of Førdefjord, Naustdal commune.

Krogh, Erling J. , 1980
Geochemistry and petrology of glaucophane-bearing eclogites and associated rocks from Sunnfjord, Western Norway.
;TIDSSKRIFTARTIKKEL;Lithos; No.13;355-380 pages
Abstract:
Country-rock eclogites and amphibolites in the Sunnfjord area occur as pods, lenses and layers within gneisses of granitic to tonalic compostition. The contacts towards the enclosing gneisses are mostly tectonic, although apparent primary intrusive contacts occur. Geochemical data show that central parts of eclogitic bodies represent fairly undisturbed magmatic compositions, while the margins of such bodies show varying degrees of contamination. Exchange of components with the enclosing gneisses occurred at both a pre-eclogitic and a post-eclogitic stage. Petrographical and petrological data show that the eclogites developed from garnet amphibolites to eclogites during a prograde stage, and that a subsequent uplift/decompression period took place at fairly constant temperatures. The data presented here are compatible with an in situ model for genesis of Norwegian country-rock eclogites.

Krogh, Erling J.; Brunfelt, Arild O. , 1981
REE, Cs, Rb, Sr and Ba in glaucophane-bearing eclogites and associated rocks, Sunnfjord, Western Norway.
;TIDSSKRIFTARTIKKEL;Chemical geology; No.33;295-305 pages
Abstract:
A study of REE (La, Ce, Nd, Sm, Eu, Tb, Yb and Lu), Cs, Rb, Sr and Ba in eclogites, amphibolites and enclosing granitic gneissees in the Sunnfjord area, western Norway, shows that the central parts of the larger eclogitic bodies, having a thickness of ~10 m, appear to have a fairly undistributed igneous composition, while smaller bodies, having a thickness of ~< 5 m, and the margins of the larger ones were enriched in REE, Cs, Rb and Ba at a pre- or early-metamorphic stage. Post-eclogite retrograde processes were accompanied by metasomatic introduction of alkalies, and Sr and Ba into the metabasites. The geochemical data are obtained by means of radiochemical neutron-activation analysis.

Dalsegg, Einar; Elvebakk, Harald; Gellein, Jomar; Kihle, Ola , 1999
Gravity measurements in eclogite mapping, Naustdal, Sogn og Fjordane, 1999.
;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.99.124;30 pages
Abstract:
The gravity measurements in the region between Naustdal and Engebø have been supplemented with 6 profiles. The objective of the measurements was to confirm the anomalies and the size of the indicated bodies from the 1998 investigations. Two profiles east of Naustdal eclogite deposit have shown that the deposit have a limited extension to the east. In the area east of Bygdahaugen, four profiles have confirmed the anomalies from 1998, and have better mapped the extension of the eclogites bodies. All profiles in this area indicates eclogite bodies, and the result from the modelling support the conclusions from 1998. The size of the possible eclogite body seems to be in order of 400 mill. tons.

Elvebakk, Harald ; Gellein, Jomar ; Furuhaug, Leif , 1999
Gravity measurements in eclogite mapping, Naustdal, Sogn og Fjordane.
;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.99.046;52 pages
Abstract:
Gravity measurements have been carried out along 10 profiles in the region in between Naustdal and Engebø. The objective of the measurements was to detect new heavy bodies of eclogite and to map the extension to the depth of the known eclogite at Bygdahaugen. To confirm the ability of the gravity method, two profiles were measured across the known eclogite deposit in Naustdal. The size (depth) of this deposit should be estimated. The results show that the gravity method is well suited for such investigations and the Naustdal deposit was clearly indicated bye a strong anomaly. To the east of Bygdahaugen a new body with a possible density of around 3400 kg/m3 (eclogite) was indicated body. The depth extent is estimated to 600 m in the model. The size of the body is probably in the same range as the Engbø deposit, approximately 400 mill. tons. More detailed investigations, both geophysical and geological, have to be carried out before drilling can start. At least four gravity profiles should be measured which will confirm the anomalies and lead to an improved estimate of the size of the indicated deposits.

Eskola, Pentti , 1920
The mineral facies of rocks
;Norsk geologisk forening;TIDSSKRIFTARTIKKEL;Norsk geologisk tidsskrift; No.6 (1-2);143-194 pages

References not to be found in NGU's Reference Archive.:
Binns, R.A. 1967: Barroisite-bearing eclogite from Naustdal, Sogn og Fjordane, Norway. J. Petrol. 8, 349-379.


Eskola, P. (1921): On the eclogites of Norway. Skr. Norske Vidensk. Akad. Oslo, Mat.-Nat. Kl. I, 8, 1-118.

Fieldsamples
Sample No. Sample type Miscellanrous
KB11E.91 Bedrock
Sampler: Are Korneliussen/...Stored: Løkken
Comment: Eclogite
No. of registrated oxide analyses = 1
NB! All analyse values are shown at the end of the printout.:


Analyse Results
from
Deposit Area 4647 - 003 Naustdal

Oxide analyses

( All values are in % )
Sample No. Sample Type SiO2 Al2O3 TiO2 Fe2O3 MnO MgO CaO
KB11E.91 Bedrock 62.78 20.03 3.22 0.90 0.01 0.81 1.15
------------------
Sample No. Na2O K2O P2O5 Sum
KB11E.91 10.18 0.24 0.15 99.00


The fact sheet was created on 22.01.2022

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