Norsk versjon
	THE ORE DATABASE
	Occurence 5524 - 016 Takelva
	(Object Id: 1209) (Last updated: 07.03.2017)

Operations

	From - To	Activity	Comments
	2011 - 2011	Geophysics	Company/Institution :NGU
			Aerial survey (mag., EM, radiometry).
	2011 - 2013	Geology	Company/Institution :NGU

Mineralization

	Era:	Proterozoic	Period:	Neoproterozoic
	Genesis:	Chemical sediment	Form:	Layer
	Main texture:	Banded	Min. distribution:	Semi-massive (20-50 % ore minerals)

Main grain size:

Medium grained (1-3 mm)

Main alteration:

No country rock alteration

	Strike/Dip:		Direction:
			Plunge:

Stratigraphic classification of host rock

Era:

Proterozoic

Period:

Mesoproterozoic

	Province:	Troms-Finnmark Basement Province
	Geotec.unit:
	Tectonic complex:	Mauken Tectonic Window
	Igneous complex:

Group:

Målselva Group

Formation:

Myrefjellet Formation

Mineralogy

	Relationship	Mineral	Amount
	Gangue mineral	Quartz	Major mineral (>10%)
	Gangue mineral	Carbonate	Major mineral (>10%)
	Gangue mineral	Biotite	Accessory mineral (<1%)
	Gangue mineral	Chlorite	Accessory mineral (<1%)
	Ore mineral	Magnetite	Major mineral (>10%)
	Ore mineral	Pyrite	Accessory mineral (<1%)

Lithology:

	Relationship	Rock	Origin
	Wall rock	Greenstone	Extrusive Original rock :Basalt
			Metamorphic facies :Greenschist

Information(s) in free text format

Free text

The iron formation forms an extensive layer within the major greenstone unit, stretching from the main road (E6) in the northwest and southeastwards up the steep slopes towards Helgemauken. It gives a strong magnetic anomaly. The total length of the zone is more than 3.5 km, while the thickness is 6-7 m. The northernmost outcrop of the zone is in the river Takelva, where it is a strongly foliated, laminated on some cm-scale, quartz- and carbonate-rich, iron formation, some 6-7 m thick. The iron mineral is magnetite. The outcrop shows isoclinal folding with development of transposed foliation. In the south, it shows more of an irregular banding, partly with lenses of fine-grained magnetite and quartz. The northern outcrop contains quartz, carbonate and magnetite as major phases, while pyrite, chlorite and biotite are accessories. The southern outcrop is dominated by quartz and magnetite, while carbonate is absent. Chlorite and grunerite are subordinate phases. Geochemistry (two samples) shows contents of 28.0 and 21.6 % Fe2O3, while the content of TiO2 is very low (0.05 and 0.01 %) for the northern and southern outcrops, respectively. The same samples contain 0.87 and 0.17% P2O5.

Bibliography:

From NGU's Reference Archive:

Bjerkgård, Terje; Henderson, Iain; Sandstad, Jan Sverre; Schönenberger, Johannes; Slagstad, Trond , 2015

	Geology of the Mauken tectonic window, Målselv, Troms

;Norges geologiske undersøkelse;RAPPORT;NGU-rapport; No.2015.013;60+kart pages

Abstract:

This report presents the results from bedrock mapping in the Mauken tectonic window, carried out in several periods in 2011-2013. During the NGU MINN program, the Mauken area has been subject to a high-resolution airborne geophysical survey (magnetometry, radiometry, EM), followed by bedrock mapping and structural geology investigations. The work in the Mauken area is part of a larger project in southern Troms, with the goal to work out a structural-tectonic-metallogenic model and interpretaion for the basement areas in the whole region.

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	TB-MA67	Bedrock	Sampler: T. Bjerkgård/...Stored: Løkken/...Size(kg): 2 Comment: Iron Formation (magnetite) No. of registrated element analyses = 1

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

Name of Locality: Outcrop

(Object Id: 32849 16,01,00)

Location

County:

Troms

Municipality:

Målselv (5524)

Map 1:50000:

Takvatnet (1533-3)

Map 1:250000:

Tromsø

Coordinate system:

EU89-UTM Zone 34

East:

407130 m.

North:

7670174 m.

Longitude:

18.6640890

Latitude:

69.1259460

Show on map

Resource

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

Resources and production

	Activity:	Exploration	Reserves:
	Operating method:		Historical production:

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	TB-MA 69	Bedrock	Sampler: T. Bjerkgård/...Stored: Løkken/...Size(kg): 1,5 Comment: Iron Formation

---

Analyse Results

from

Deposit Area 5524 - 016 Takelva

Element analyses

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

Sample No.	Sample Type	Cu*	Zn*	Pb*	Co*	Ni*	As*	Ba*
TB-MA67	Bedrock	4	16	6	30	30	16	111

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

Sample No.	Mo*	Ga*	V*	Mn*	Fe%	U*	W*	Rb*	Sr*
TB-MA67	1.00	-1.00	16	2788	19.58	1.00	-1	3.0	59.0

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

Sample No.	Y*	Zr*	Nb*	Cs*	La*	Ce*	Pr*	Nd*	Sm*
TB-MA67	16.0	7	-1.00	-1.00	15.00	29.00	3.00	15.00	3.00

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

Sample No.	Eu*	Gd*	Tb*	Dy*	Ho*	Er*	Tm*	Yb*	Lu*
TB-MA67	-1.00	4.00	-1.00	3.00	-1.00	1.00	-1.00	1.00	-1.00

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

Sample No.	Na*	Mg*	Al*	Si*	P*	K *	Ca*	Ti*	Hf*
TB-MA67	37	844	1270	######	3797	415	51458	30	-1.00

---

The fact sheet was created on 28.04.2024

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

Copyright © 2024 Geological Survey of Norway