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	THE ORE DATABASE
	Occurence 1112 - 009 Vasshus
	(Object Id: 5007) (Last updated: 26.06.2008)

Operations

	From - To	Activity	Comments
	1999 - 2005	Sampling	Company/Institution :Geological Survey of Norway
	2001 - 2002	Geochemistry	Company/Institution :Geological Survey of Norway

Mineralization

	Era:	Proterozoic	Period:	Neoproterozoic
	Dating:	931 (-3\+3) million year	Method:	U/Pb
	Genesis:	Orthomagmatic formation	Form:	Layer
	Main texture:	Banded	Min. distribution:	Semi-massive (20-50 % ore minerals)

Main grain size:

Medium grained (1-3 mm)

Main alteration:

	Strike/Dip:		Direction:
			Plunge:

Ti-deposit type(s)

	Main type:	Magmatic	Ilm/Mt-ratio:	1 - 5
	Sub type:	Mt +/- Ilm +/- Ap in mafic intrusion	%TiO(Ore):
	Titanium province:	Rogaland anorthosite province	%P2O5(Ore):
	Host rock:	Norite	%MgO(Ilm):
	Main Ti mineral:	Ilmenite	%V2O3(Mt):
			ppm U (Rutile):

Stratigraphic classification of host rock

Era:

Proterozoic

Period:

Neoproterozoic

	Province:	South Norwegian Basement Province
	Geotec.unit:
	Tectonic complex:
	Igneous complex:	Egersund Anorthosite Complex

Group:

Bjerkreim Sokndal Intrusion

Formation:

Mineralogy

	Relationship	Mineral	Amount
	Gangue mineral	Pyroxene	Major mineral (>10%)
	Gangue mineral	Plagioclase	Major mineral (>10%)
	Gangue mineral	Biotite	Accessory mineral (<1%)
	Ore mineral	Ilmenite	Major mineral (>10%)
	Ore mineral	Magnetite	Subordinate mineral (1-10%)
	Ore mineral	Apatite	Subordinate mineral (1-10%)

Lithology:

	Relationship	Rock	Origin
	Host rock	Gabbronorite	Intrusive Original rock :Gabbro norite
			Metamorphic facies :Unmetamorphosed

Information(s) in free text format

Abstract

Oxide- and apatite-rich modally layered gabbronorite in the Bjerkreim-Sokndal Layered Intrusion in the Rogaland Anorthosite Province. The stratigraphic sequence, to wich the Vasshus deposit belong, is conventionally denoted MCU3-e and may be followed along strike from Rappstad in the southern extension around the hinge of the Bjerkreim lobe to Ualand in the northeastern extension - a total distance of approximately 25 km - but is absent for about 8 km in the central part of the intrusion, due to extensive dyke emplacement (the Lomland Jotunitic Dyke). The thickness of the zone is variable, both stratigraphically and in exposure, decreasing from up to 300 m in the central most part to around 50 m on the flanks. Although the presence of a persistent melanocratic apatite- and oxide-enriched sequence has not been fully documented (partly due to lakes and sedimentary cover) in the MCU3e, melanocratic sequences are at least very frequent.

Description

The northern flank is overall more melanocratic than the southern flank (see deposit Helleland), and extensive sampling has been performed at Terland N. and Teksevatnet-Timrevik. At Terland N. the MCU3e zone has a total stratigraphic thickness of 300 m. At Teksevatnet-Timrevik, 2.5 km further southeast, the thickness of MCU3e has been reduced to around 80 m. At the east end of Teksevatnet, our investigations were somewhat hampered by poor exposure, but a melanocratic gabbronorite was encountered in the top of MCU3e at Bjørnemoen. This isolated sample at Vasshus, 9-10 km south-east of the Teksevatnet-Timrevik profile further indicates that the zone is continuous. The sample at Vasshus represent the top of the Bjerkreim-Sokndal Intrusion MCU3e unit, carrying apatite, ilmenite and magnetite. The area is extensively covered. Norm calculations from XRF whole rock analyses gives a total of 16.3 % ilmenite, 7.9 % magnetite and 8.1 % apatite.

Free text

The deposit located at Vasshus is part of the same zone (MCU3-e) as the deposit descibed as Helleland, Terland N. and Teksevatnet-Timrevik (All three situated in Eigersund County). The sample at Vasshus represents the top of the Bjerkreim-Sokndal Intrusion MCU III unit, carrying apatite, ilmenite and magnetite.

References

Schärer, U., E. Wilmart, et al. (1996). The short duration and anorogenic character of anorthosite magmatism: U-Pb dating of the Rogaland complex, Norway. Earth Planet. Sci. Lett. 139: 335-350. Egersund-Ogna: 929±2 Ma Helleren: 932±3 Ma Åna-Sira: 932±3 Ma Tellnes jotunite dyke: 931±5 Ma Tellnes ilmenite norite: 920±3 Ma Deformation of foliated margin in Egersund-Ogna: 915 Ma

Photo(s) from the Deposit area:

Photo no. 1 showing Location of Vasshus" Photo no. 2 showing Ollestad and Vasshus"

Bibliography:

From NGU's Reference Archive:

Korneliussen, Are; McEnroe, Suzanne A.; Nilsson, Lars-Petter; Schiellerup, Henrik; Gautneb, Håvard; Meyer, Gurli B.; Størseth, Leif Roger , 2000

	An overview of titanium deposits in Norway

;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU Bulletin; No.436;27-38 pages

Abstract:

Titanium deposits in Norway are of three major types: igneous, metasomatic and metamorphic. The igneous deposits are compared of ilmenite, magnetite and apatite in various proportions and occur in geological provinces of different ages. and some have a metamorphic overprint. The other majord Ti ore-types is the rutile-bearing eclogites in western Norway that formed during the Caledonian high-pressure metamorphism of predominantly Proterozoic basic igneous rocks. The third Ti ore-Type is the Proterozoic rutile-bearing, scapolitised and albitised rocks in the Bamble region of South Norway.

Meyer, G.B.; Schiellerup, H.; Tegner, C. , 2002

	Chemical characterisation of ilmenite, magnetite and apatite in the Bjerkreim-Sokndal Layered Intrusion, Rogaland, South Norway

;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.2002.042;25 pages

Abstract:

During 2001 cooperation was established between NGU and Norsk Hydro Agri in order to locate combined resources of apatite, ilmenite and vanadium magnetite in the Bjerkreim-Sokndal layered Intrusion in the Rogaland Anorthosite Province of aouth Norway. It had previously been recognized that a potential existed for finding coexisting apatite, low-Mg= ilmenite and vanadium-rich magnetite in the northern part (the Bjerkreim-lobe) of the layered intrusion. It had also become apparent that none of the minerals are present in amounts that can support exploitation of one mineral alone. Fieldwork was undertaken during July 2001 with the purpose of locating and constraining the most promising areas in terms of volume and grade of the three target minerals in the Bjerkreim-lobe. Three apatite-bearing and oxide-rich zones were singled out, sampled and preliminarily constrained. These zones are located with one area in mega-cyclic unit (MCU) IBe (Åsen-Bjerkreim), containing up to 41% of the three minerals, two areas in MCU IIIe (Helland and Terland respectively), with up to 34% of the three minerals, and in MCU IVe (Teksevatnet-Vasshus), with 32% ilmenite, magnetite and apatite. The fieldwork and subsequent whole-rock chemical analyses (XRF) were described and discussed by Schiellerup et al. (2001). In the apatite. and oxide-rich part of MCU IBe the MgO-content of ilmenite vary between 1.36 and 2.26% with an average of 1.8%. Stratigraphically dependant variation has not been resolved and the highest MgO contents in ilmenite tend to occur in the most mafic layers. In the two MCU III prospects at Helleland and Terland the MgO-content in ilmenite averages 2.2 and 2.5% respectively, whereas the Teksevatnet profile yield an average of 1.4% MgO in ilmenite. In the Teksevatnet profile the modal contrast between mafic and felsic layers is exceptional and the MgO-content of ilmenite is consi

Schiellerup, H.; Meyer, G.B.; Tegner, C.; Robins, B.; Korneliussen, A. , 2001

	Resources of apatite, ilmenite and magnetite in the Bjerkreim Sokndal Layered Intrusion, Rogaland, South Norway

;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.2001.092;33 pages

Abstract:

The Rogaland Anorthosite Province in southwest Norway is well known for its many ilmenite deposits, of which Tellnes is at present the only one in product- ion In addition to ilmenite, the province carries a significant potential for apatite and vanadium-rich magnetite occurring in the layered series of the Bjerkreim-Sokndal Layered Intrusion. The current study was undertaken in order to locate exploitable resources of combined apatite, ilmenite and vanadian magnetite in the Bjerkreim-lobe of the Bjerkreim-Sokndal intrusion.

Name of Sample point: NH-56

(Object Id: 16106 9,06,01)

Location

County:

Rogaland

Municipality:

Lund (1112)

Map 1:50000:

Ørsdalsvatnet (1312-3)

Map 1:250000:

Mandal

Coordinate system:

EU89-UTM Zone 32

East:

346123 m.

North:

6490991 m.

Longitude:

6.3569860

Latitude:

58.5321900

Show on map

Resource

	Resource Type:	Ferrous metals(Fe, Mn, Ti)	Resource Subtype:	Iron-Titanium
			Element(s):	Fe Ti P

Information(s) in free text format

Description

MCU 3e. Very melanocratic norite layer (phimaC), c. 10 cm. From section where melanocratic layers dominate over leucocratic layers. Located along the NE shore of Vasshusvika.

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