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	MALMDATABASEN
	Forekomstområde 1573 - 005
	(Sist oppdatert 27.mar.2020)

Betydning

Offentlig:

Little Importance (reg. 18.02.2015)

Economical:

Lite viktig

Mineralization

	Era:	Paleozoic	Period:	Ordovician
	Dating:		Method:
	Genesis:	Vulkeks	Form:	Linse
	Main texture:	Båndet	Min. distribution:	Semi-massiv

Main grain size:

Finkornet (<1 mm)

Main alteration:

Klorittisering

	Strike/Dip:		Direction:
			Plunge:

Stratigraphic classification of host rock

Era:

Paleozoic

Period:

Ordovician

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

Group:

Formation:

Mineralogy

	Relationship	Mineral	Amount
	Gangue mineral	Quartz	Major mineral (>10%)
	Gangue mineral	Feldspar	Major mineral (>10%)
	Gangue mineral	Amphibole	Major mineral (>10%)
	Gangue mineral	Epidote	Subordinate mineral (1-10%)
	Gangue mineral	Calcite	Subordinate mineral (1-10%)
	Ore mineral	Magnetite	Major mineral (>10%)
	Ore mineral	Pyrite	Major mineral (>10%)
	Ore mineral	Chalcopyrite	Subordinate mineral (1-10%)

Lithology:

	Relationship	Rock	Origin
	Wall rock	feltspatporfyr	Intrusive
			Metamorphic facies :Greenschist
	Wall rock	grønnstein	Extrusive Original rock :Basalt
			Metamorphic facies :Greenschist

Structures

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Wall rock	Primary layering	Strike/Dip :117 / 55	Syn-mineralisation ;...Effect :Controls

Opplysning(er) i fritekstformat

Fri tekst

Mineraliseringene ligger på norsida av øya Brettingen. Berggrunnen på øya domineres av grønne øg grågrønne finkornete grønnsteiner med antatt basaltisk til andesittisk sammensetning. I tillegg opptrer flere typer ganger, gjerne feltspat porfyriske. Den stratiforme mineraliseringene finnes i et 30 m langt og 3 m bredt øst-vest orientert søkk. Mindre røsking er foretatt på små linser av båndet jern-malm og er opptil 1 m mektige. I tillegg er mindre sprengninsarbeider utført langs mindre rustsoner (10-30 cm brede) som dels er noe forskifret og fører tynne (1-2 cm) kalkspat årer. Svovelkis og mindre mengder kobberkis og magnetkis opptrer disseminert rundt en sentral magnetitt-svovelkis rik sone.

Bibliography:

From NGU's Reference Archive:

Gautneb, Håvard; Roberts, David , 1989

	Geology and petrochemistry of the Smøla-Hitra Batholith, Central Norway.

;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU Bulletin; No.416;1-24 pages

Abstract:

The plutonic rocks which compose the Smøla-Hitra Batholith (SHB) cover an exposed area of c.1000 km² and intrude folded, Arenig-Llanvirn, low-grade meta-sedimentary and bimodal metavolcanic rocks and higher-grade polydeformed gneisses of probable Proterozoic age. The SHB is unconformably overlain by Old Red Sandstone sediments of possible Late Silurian to definite Middle Devonian age. Field relations demonstrate that the oldest rock-types in the batholith comprise gabbro, monzodiorite and hornblende diorite. These are succeeded by tonalite, granodiorite and granite, which occur both as plutons and as abundant dykes and veins. Later members of the SHB include composite dykes, porphyritic microdiorite, appinitic pipe-like bodies, dolerite dykes and lastly, granophyre dykes. The hypabyssal rocks post-date a phase of weak, heterogeneous deformation manifested locally within the various plutons. Pressure estimates from hornblende compositions indicate a pressure of solidification of 0.26 +-0.1 GPa, corresponding to a depth of about 9 km. Preliminary isotopic dating has indicated an age range from c. 450 to c. 428 MA; latest Mid-Ordovician to Early Silurian. The rocks of the SHB show little sign of the Scandian deformation and metamorphism which are so common elsewhere in this part of Norway.

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	MR0075.03	Bedrock	Sampler :Sandstad, J.S./...Stored :Løkken Kommentar :Magnetitt-malm, finkornet, dels båndet i veksling med grovkornet pyritt og kvartsrikere bånd med amfibol linser No. of registrated element analyses = 1
	MR0075.04	Bedrock	Sampler :Sandstad, J.S./...Stored :Løkken Kommentar :Pyritt-magnetitt malm, båndet, grovkornet pyritt dominerer, kvarts rike lag No. of registrated element analyses = 1

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

Navn på sample point : Brettingen SØ

(Objekt Id : 1573,005,00,01)

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Lokalisering

Fylke :

Møre og Romsdal (15)

Kommune :

Smøla (1573)

Kart 1:50000:

Smøla (1321-1)

Kart 1:250000:

Kristiansund

Markeringspunkt:

(Unavailable)

Materialtype

	Hovedtype:	Basemetaller (Cu,Zn,Pb,Fe sulfider,As,Sb,Bi,Sn)	Subtype:	Kobber
			Element(s):	Cu Fe

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	MR0075.01	Bedrock	Sampler :Sandstad, J.S./...Stored :Løkken Kommentar :Grønnstein, grønn, fink- svært finkornet, svak kobberkis-mineralisering på stikk og disseminert (10-30 cm bred sone) No. of registrated element analyses = 1

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

Navn på sample point : Brettingen Ø

(Objekt Id : 1573,005,00,02)

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Lokalisering

Fylke :

Møre og Romsdal (15)

Kommune :

Smøla (1573)

Kart 1:50000:

Smøla (1321-1)

Kart 1:250000:

Kristiansund

Markeringspunkt:

Lengdegrad:

8.1961970

Breddegrad:

63.4184610

EU89-UTM Zone 32

(Coordinates IS confirmed)

X-koord:

459870 m.

Y-koord:

7032466 m.

Materialtype

	Hovedtype:	Basemetaller (Cu,Zn,Pb,Fe sulfider,As,Sb,Bi,Sn)	Subtype:	Kobber
			Element(s):	Cu Fe

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	MR0075.02	Bedrock	Sampler :Sandstad, J.S./...Stored :Løkken Kommentar :Kobberkis+pyritt og magnetitt mineralisering i finkornet, blålig grønn bergart (omvandlet grønnstein) (20-30 cm bred sone) No. of registrated element analyses = 1

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

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Analyse Results

from

Forekomstområde 1573 - 005 Brettingen

Element analyses

( *=parts pr. million, #=parts pr.billion, Negative values means below detection limit value.)

Sample No.	Sample Type	Cu*	Zn*	Pb*	Co*	Ni*	Ag*	Au#
MR0075.01	Bedrock	6089	25	4	27	21	1.2	4035.0
MR0075.02	Bedrock	20000	53	20	215	77	2.4	1860.0
MR0075.03	Bedrock	1887	33	34	354	114	-.2	62.0
MR0075.04	Bedrock	6028	41	30	712	563	.8	168.0

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Sample No.	Pt#	Pd#	As*	Cd*	Ba*	Mo*	Sn*	Sb*	Bi*
MR0075.01	-5.0	2.0	-5	-1.0	21	8.00	-20	-5	-5
MR0075.02	-5.0	-1.0	-5	-1.0	15	231.00	-20	-5	-5
MR0075.03	-5.0	-1.0	-5	-1.0	3	6.00	-20	-5	-5
MR0075.04	-5.0	-1.0	-5	-1.0	-2	9.00	-20	-5	-5

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

Sample No.	V*	Cr*	Mn*	Fe%	W*	Sr*	La*	Na*	Mg*
MR0075.01	104	165	226	4.30	-20	35.0	9.00	0	1
MR0075.02	181	218	97	8.88	-20	70.0	9.00	0	0
MR0075.03	177	312	189	10.00	-20	17.0	-1.00	0	1
MR0075.04	81	286	287	10.00	-20	8.0	-1.00	0	1

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Sample No.	Al*	K *	Ca*	Te*
MR0075.01	2	0	1	-10.00
MR0075.02	1	0	1	-10.00
MR0075.03	2	0	0	-10.00
MR0075.04	2	-0	0	-10.00

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Faktaarket ble generert 13.06.2026

Spørsmål eller kommentarer vedrørende faktaarket kan mailes til: ressursdatabaser@ngu.no

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