English version
	MALMDATABASEN
	Forekomstområde 1663 - 021
	(Sist oppdatert 04.jul.2023)

Betydning

Offentlig:

(No data)

Economical:

Lite viktig , (Confirmed 30.jun.2023 by Jan Sverre Sandstad)

Mineralization

	Era:	Paleozoic	Period:	Ordovician
	Dating:		Method:
	Genesis:	Vulkeks	Form:	Lag
	Main texture:	Båndet	Min. distribution:	Disseminert

Main grain size:

Finkornet (<1 mm)

Main alteration:

	Strike/Dip:	320 / 70	Direction:
			Plunge:

Stratigraphic classification of host rock

Era:

Paleozoic

Period:

Ordovician

	Province:	Caledonides
	Geotec.unit:	Trondheim Nappe Complex
	Tectonic complex:
	Igneous complex:

Group:

Støre Group

Formation:

Mineralogy

	Relationship	Mineral	Amount
	Gangue mineral	Quartz	Major mineral (>10%)
	Ore mineral	Hematite	Major mineral (>10%)
	Ore mineral	Magnetite	Subordinate mineral (1-10%)

Lithology:

	Relationship	Rock	Origin
	Host rock	Jaspis	Sedimentary Original rock :Exhalite
			Metamorphic facies :Greenschist
	Wall rock	Grønnskifer	Extrusive Original rock :Basalt
			Metamorphic facies :Greenschist

Structures

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Wall rock	Schistosity	Strike/Dip :320 / 70	Post-mineralisation ;...Effect :Modifies

Opplysning(er) i fritekstformat

Fri tekst

Flåkåmyra ligger på nordsida av Lauvdalen og en bomvei kan følges fra Selbuveien og ca. 1,5 km innover dalen. En ca. 12 m lang, gjengrodd dagskjæring med retning 60° fører fram til en blotning med en minst 1,5 m mektig jaspis med hematitt innerst i skjæringa. Over denne finnes grønnskifer. Mindre blotninger av jaspis og grønnskifer finnes også ellers i skjæringa. Prøver av fast fjell og fra tippen gir bare lave jernverdier (< 6 % Fe2O3).

Bibliography:

From NGU's Reference Archive:

Torske, Tore , 1965

	Geology of the Mostadmarka and Selbustrand area, Trøndelag.

;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.232;1-83 + ka pages

Abstract:

The bedrock of the area consists of metamorphic epiclastic, volcanic, and intrusive rocks of assumed Lower Ordovician age, assigned to, and lithologically matching the rocks of, the Røros, Støren and Lower Hovin Groups of the Trondheim Region. A detailed petrographic description of the rock varieties is given. The metamorphic grade of all rocks corresponds to the Greenschist Facies. - Small ore deposits occur in connection with the volcanic rocks. They comprise pyrite-pyrrhotite ores of the Leksdal Type, mixed pyrite-magnetite ores, and iron oxide ores. - Lithological variations of the sedimentary rocks is tentatively correlated with events during the early periods of the Caledonian Orogeny. - The volcanism within the area seems to have started with a phase of explosive activity, followed by extrusion (mostly submarine) of copious amounts of spilitic lavas; towards the end of the main period of volcanism a new episode of explosive activity has produced what is called the upper pyroclastic horizon, comprising rocks ranging from coarse volcanic breccia to finegrained tuffs. - The intrusive rocks consist mainly of saussurite gabbros and quartz keratophyres. The latter are thought to be intrusive rather than effusive, and evidence is offered to support this. In some places the character of pyroclastic material points to a quartz keratophyre parentage. Thus, quartz keratophyres may have occurred both as intrusive and volcanic rocks.

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	Flåkåmyra-1	Bedrock	Sampler :J.S.Sandstad/...Stored :Løkken/...Size(kg) :2 Kommentar :Jaspis med hematitt+magnetitt No. of registrated element analyses = 1 No. of registrated oxide analyses = 1
	Flåkåmyra-2	Dump	Sampler :J.S.Sandstad/...Stored :Løkken/...Size(kg) :2 Kommentar :Jaspis med hematitt+magnetitt No. of registrated element analyses = 1 No. of registrated oxide analyses = 1

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

---

Analyse Results

from

Forekomstområde 1663 - 021 Flåkåmyra

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#
Flåkåmyra-1	Bedrock	5	2	0	2	21	-.1	-.5
Flåkåmyra-2	Dump	5	2	0	1	24	-.1	.5

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

Sample No.	As*	Cd*	Ba*	Mo*	Sn*	Sb*	Bi*	Se*	Ga*
Flåkåmyra-1	1	-.1	2	1.10	-1	-0	-0	-0.50	1.00
Flåkåmyra-2	-1	-.1	4	1.80	-1	-0	-0	-0.50	2.20

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

Sample No.	S%	V*	Fe%	Th*	U*	W*	Rb*	Sr*	Y*
Flåkåmyra-1	-.02	-8	5.18	-0.20	-0.10	-1	0.2	2.8	0.8
Flåkåmyra-2	-.02	24	5.56	-0.20	0.40	-1	0.4	111.0	1.7

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

Sample No.	Zr*	Nb*	Ta*	Cs*	La*	Ce*	Pr*	Nd*	Sm*
Flåkåmyra-1	6	0.40	-0.10	-0.10	0.30	0.60	0.05	-0.30	-0.05
Flåkåmyra-2	5	0.70	-0.10	0.10	0.60	0.90	0.09	0.30	0.10

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

Sample No.	Eu*	Gd*	Tb*	Dy*	Ho*	Er*	Tm*	Yb*	Lu*
Flåkåmyra-1	-0.02	0.09	0.01	0.11	-0.02	0.08	0.01	0.08	0.01
Flåkåmyra-2	0.04	0.19	0.03	0.18	0.05	0.15	0.02	0.12	0.02

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

Sample No.	Be*	P*	Hf*	Hg*	Tl*
Flåkåmyra-1	1	175	-0.10	-0	-0
Flåkåmyra-2	-1	44	-0.10	-0	-0

Oxide analyses

( All values are in % )

Sample No.	Sample Type	SiO2	Al2O3	TiO2	Fe2O3	MnO	MgO	CaO
Flåkåmyra-1	Bedrock	92.43	0.16	0.01	7.40	0.03	0.04	0.09
Flåkåmyra-2	Dump	90.74	0.55	0.02	7.95	0.02	0.06	0.89

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

Sample No.	Na2O	K2O	P2O5	Sum
Flåkåmyra-1	0.05	-0.01	0.04	100.00
Flåkåmyra-2	0.02	-0.01	0.01	100.00

---

Faktaarket ble generert 13.06.2026

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

Copyright © 2026 Norges geologiske undersøkelse