Norsk versjon
	THE INDUSTRIAL MINERAL DATABASE
	Deposit Area 1524 - 307
	(Last updated 11.okt.2010)

Importance

Public:

Little Importance (reg. 18.02.2015)

Economical:

Minor interest , (Confirmed 20.feb.2006 by Havard Gautneb)

Mineralization

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

Main grain size:

	Strike/Dip:		Direction:
			Plunge:

Stratigraphic classification of host rock

Era:

Period:

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

Group:

Formation:

Mineralogy

	Relationship	Mineral	Amount
	Not defined	Olivine	Major mineral (>90%)

Information(s) in free text format

Free text

Forekomsten er en av flere mindre dunittkropper som ligger inne i Tafjordalen. Bergarten er en ganske frisk og ren dunitt. Forekomsten har en størrelse på ca. 300x100 meter og er forholdsvis godt blottet. Den ligger imidlertid noe vanskelig til i en bratt dalside langt fra vei.

Bibliography:

From NGU's Reference Archive:

Brueckner, H.K. , 1977

	A structural, stratigraphic and petrologic study of anorthosites, eclogites and ultramafic rocks and their country rocks, Tafjord area, western South Norway.

;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.332;1-53 + pl pages

Abstract:

The Tafjord area of the central basal gneiss region contains Caledonized metamorphic rocks divided into two groups. The 1000 m.y. old Fetvatn Geniss is a homogeneous zone of granodioritic gneiss that was intruded as part of a large plutonic complex during the Sveconorwegian Cycle. The heterogeneous Vikvatn Sequence contains obvious metasedimentary and metavolcanic rocks and is comprised of the Øyen, Øvste Rødal and Svartegga groups. In addition, anothosite, eclogite and anhydrous peridotite occur within the Øyen and Øvste Rødal groups. The quartizite-rich Svartegga group may form the basal (Eocambrian) part of the Caledonian supracrustal sequence typical of the eastern basal gneiss region. The Øyen and Øvste Rødal groups would then be Precambrian metasedimentary sequences seperated from the Svartegga group by a major unconformity. Structures include two early generations (F1A og F1B) of east-plunging, reclined, isoclinal, similar folds. Later (F2) folds generally have a concentric geometry, disharmonic profiles and variable axes. The F1 and F2 fabrics are identical to stuctures in the eastern basal geniss region that are believed to have formed during the Caledonian orogeny; but the F1A fabric may be a heterogeneous assemblage of Precambrian structures that were homogenized (Caledonized) during the intense F1B deformation.

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	NGUHG97064	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
	NGUHG97065	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
	NGUHG97066	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
	NGUHG97067	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
	NGUHG97068	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
	NGUHG97069	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.:

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Analyse Results

from

Deposit Area 1524 - 307 Kaldhussæter

Oxide analyses

( All values are in % )

Sample No.	Sample Type	SiO2	Al2O3	TiO2	Fe2O3	MnO	MgO	CaO
NGUHG97064	Bedrock	41.10	0.56	0.00	8.00	0.09	48.70	0.44
NGUHG97065	Bedrock	42.40	0.47	0.00	6.90	0.10	48.60	0.09
NGUHG97066	Bedrock	42.80	0.69	0.00	7.10	0.09	47.80	0.14
NGUHG97067	Bedrock	41.20	0.38	0.00	7.20	0.09	50.00	0.14
NGUHG97068	Bedrock	41.80	0.59	0.00	7.10	0.09	49.00	0.05
NGUHG97069	Bedrock	42.80	0.96	0.00	7.30	0.10	46.00	0.89

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Sample No.	Na2O	K2O	P2O5	Loss	Sum
NGUHG97064	0.00	0.01	0.00	1.10	100.00
NGUHG97065	0.00	0.00	0.00	1.12	100.00
NGUHG97066	0.00	0.00	0.00	1.20	100.00
NGUHG97067	0.00	0.00	0.00	0.76	100.00
NGUHG97068	0.00	0.00	0.00	1.09	100.00
NGUHG97069	0.00	0.01	0.00	1.96	100.00

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The fact sheet was created on 11.05.2024

Questions or comments regarding the fact sheet can be emailed to: ressursdatabaser@ngu.no

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