Fact Sheet for Deposit Area 1566

					Norsk versjon
	THE INDUSTRIAL MINERAL DATABASE
	Deposit Area 1566 - 308
	(Last updated 14.okt.2020)

Name of Deposit Area : Tverrådalen

(Object Id : 1566,308,00,00)

Drill Cores from the Deposit Area: See Borehole Area Tverrådalen

Location

County :

Møre og Romsdal (15)

Municipality :

Surnadal (1566)

Map 1:50000:

Snota (1420-1)

Map 1:250000:

Ålesund

Marking point:

Longitude:

8.8584910

Latitude:

62.9379080

EU89-UTM Zone 32

(Coordinates IS confirmed)

X-coord:

492816 m.

Y-coord:

6978679 m.

Commodity

Main Type:

Silica

Sub Type:

Quartzite

Production

Activity:	Exploration	Reserves:	2,5 thousand tons
Prod. method:		Production:
Prod. status:	Not yet active	Volume of dump:

Importance

Public: Little Importance (reg. 18.02.2015)

Economical: Minor interest , (Confirmed 27.sep.2006 by Axel Muller)

Mineralization

Era: Proterozoic Period:

Dating: Method:

Genesis: Regional metamorphic Form: Lens

Main texture: Banded Min. distribution:

Main grain size: Fine grained (< 1 mm)

Strike/Dip: Direction:

Plunge:

Stratigraphic classification of host rock

Era: Period:

Province:

Geotec.unit:

Tectonic complex:

Igneous complex:

Group: Formation:

Information(s) in free text format

Free text

The kyanite quartzite of Tverrådalen is situated about 8 km beeline and 12 km by road SE of the community centre Skei at the innermost part of Øvstebødalen. The valley is here called Tverrådalen. The kyanite quartzite occurs at the southern steep slope at the altitude 300 m a.s.l. and 100 m above the river Tverråa. The outcrop extends 10 x 5 m. The deposit was studied in detail by Wanvik (1998). Two core drill holes, 9 and 5 m in depth, were performed. The thickness of the kyanite quartzite lens dipping 85° southward is 5.5 m. The deposit is situated in the border area between the basal, autochthonous Proterozoic gneiss units and the allochthon Caledonian nappe rocks that extends from the Trondheim region along Surnadal and further westwards to the Molde area. Detailed mapping of the area was carried out by Tørudbakken (1982). The kyanite quartzite lens is associated with small amphibolite lenses with a thickness of 5 to 50 m. Both units are hosted in granitic gneiss of Middle Proterozoic age (0.9-1.6 billion years). The thrust zone of the Caledonian nappes is about 1 km north of the deposit. The average composition of 11 samples from the kyanite quartzite of Tverrådalen is 65 wt.% quartz, 31 wt.% kyanite, 3-5 wt.% muscovite and 0.5 wt.% rutile wherby the quartz content varies between 75 and 55 wt.% and the kyanite content between 20 and 44 wt% (Wanvik 1998). SiO2 varies between 68 and 83 wt.% and Al2O3 between 13 and 31 wt.%. The average crystal size of quartz is 0.318 mm (n=200). Kyanite plates are about 800 µm in length and contain common inclusion of quartz. Occasionally, kyanite is overgrown by retrograde muscovite along micro-shear zones. About 10% of the kyanite crystals are completely sericitised. Quartz of the Tverrådalen deposit has an average Ti content of 10.6 ppm. Al varies between 14.0 and 18.5 ppm. Li, Be, B, Mn, K, Ca and Fe are generally below the limit of detection. The average Ge concentration is 0.43 ppm.

Photo(s) from the Deposit area:

Photo no. 1 showing Outcrop of the Tverrådalenl kyanite quartzite"

Photo no. 2 showing Section of the Tverrådalen kyanite quartzite"

Photo no. 3 showing Micrograph of kyanite quartzite"

Bibliography:

From NGU's Reference Archive:

Tørudbakken, Bjørn O , 1982

En geologisk undersøkelse i nordre Trollheim ved Surnadal, med hovedvekt på sammenhengen mellom strukturer, metamorfe og aldersforhold.

;UiO Geologisk fellesråd;AVHANDLING

Wanvik, Jan Egil , 1998

Kyanite investigations in Tverrådalen, Surnadal

;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.98.080;23 pages

Abstract:

A kyanite-quartzite south-east of Skei in Surnadal has been investigated by field sampling and core drilling with Pack Sack equipment. The 5-6 m thick layer, identified only in a single outcrop, has an average kyanite content of 30% according to analyses of the drill cores. The deposit has a near vertical plunge and the lateral extension is unknown, due to lack of outcrops.

Müller, Axel ; Wanvik, Jan Egil ; Kronz, Andreas , 2005

Norwegian kyanite quartzites - potential resources of high purity quartz?

;Norges geologiske undersøkelse;RAPPORT;NGU-rapport; No.2005.039;70 s. pages

Abstract:

Forkortet: This study represents an evaluation of Norwegian kyanite quartzite occurrences as potential deposits of high purity quartz raw material. Kyanite quartzites are rare fine-grained with 70 to 85 vol. % quartz and > 15 vol. % kyanite (Al2SiO5) which occur in Proterozoic supracrustal rock units. Kyanite quartzites form stratiform lens-shaped bodies, which can extend several kilometers.

Fieldsamples

Sample No. Sample type Miscellanrous

DH1 0-3.5m Bedrock

Sampler :Wanvik/...Stored :NGU

Comment :Kyanite-poor kyanite quartzite

No. of registrated oxide analyses = 1

DH1 3.5-4.8m Bedrock

Sampler :Wanvik/...Stored :NGU

Comment :Kyanite-rich kyanite quartzite

No. of registrated oxide analyses = 1

DH2 0-1.1m Bedrock

Sampler :Wanvik/...Stored :NGU

Comment :Kyanite-rich kyanite quartzite

No. of registrated oxide analyses = 1

DH2 1.1-3.5m Bedrock

Sampler :Wanvik/...Stored :NGU

Comment :Kyanite-rich kyanite quartzite

No. of registrated oxide analyses = 1

DH2 3.5-5.5m Bedrock

Sampler :Wanvik/...Stored :NGU

Comment :Kyanite-rich kyanite quartzite

No. of registrated oxide analyses = 1

DH2 5.5-9.1m Bedrock

Sampler :Wanvik/...Stored :NGU

Comment :Kyanite-rich kyanite quartzite

No. of registrated oxide analyses = 1

1907401 Bedrock

Sampler :Muller/...Stored :NGU

Comment :Kyanite-poor kyanite quartzite

No. of registrated element analyses = 1

No. of registrated mineral analyses = 3

No. of registrated oxide analyses = 1

5 Bedrock

Sampler :Wanvik/...Stored :NGU

Comment :Kyanite-rich kyanite quartzite

No. of registrated oxide analyses = 1

6 Bedrock

Sampler :Wanvik/...Stored :NGU

Comment :Kyanite-rich kyanite quartzite

No. of registrated oxide analyses = 1

7 Bedrock

Sampler :Wanvik/...Stored :NGU

Comment :Kyanite-poor kyanite quartzite

No. of registrated oxide analyses = 1

8 Bedrock

Sampler :Wanvik/...Stored :NGU

Comment :Kyanite-rich kyanite quartzite

No. of registrated oxide analyses = 1

9 Bedrock

Sampler :Wanvik/...Stored :NGU

Comment :Kyanite-poor kyanite quartzite

No. of registrated oxide analyses = 1

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

Analyse Results

from

Deposit Area 1566 - 308 Tverrådalen

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*

1907401 Bedrock -10 7 -10 8 -5 -5 399

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

Sample No. Mo* Ga* S% V* Cr* Th* W* Sr* Y*

1907401 -5.00 -10.00 -.10 25 -10 8.00 31 5.0 -5.0

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

Sample No. Zr* Nb* La* Ce* Pr* Nd* Sc* Hf*

1907401 310 16.00 13.00 10.00 -10.00 -10.00 26.00 14.00

Mineral analyses
( All values are in ppm. Negative values means below detection limit value.)

Sample No. Sample Type Mineral Li Be B

1907401 Bedrock Quartz -1.000 -.400 -1.000

1907401 Bedrock Quartz -1.000 -.400 -1.000

1907401 Bedrock Quartz -1.000 -.400 -1.000

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

Sample No. Na Al P K Ca Ti Mn Fe Ge

1907401 -20.000 14.000 -5.000 -.200 -15.000 8.000 -.100 -.400 .400

1907401 -20.000 13.900 -5.000 .490 -15.000 13.600 -.100 -.400 .400

1907401 -20.000 18.500 -5.000 -.200 -15.000 10.300 -.100 .400 .500

Oxide analyses
( All values are in % )

Sample No. Sample Type SiO2 Al2O3 TiO2 Fe2O3 MnO MgO CaO

DH1 0-3.5m Bedrock 78.64 16.96 0.45 0.31 -0.01 0.11 0.05

DH1 3.5-4.8m Bedrock 75.49 21.81 0.47 0.10 -0.01 0.11 0.02

DH2 0-1.1m Bedrock 80.26 18.15 0.35 0.19 -0.01 0.09 0.02

DH2 1.1-3.5m Bedrock 69.38 27.88 0.46 0.27 -0.01 0.11 0.07

DH2 3.5-5.5m Bedrock 78.35 18.82 0.38 0.24 -0.01 0.10 0.05

DH2 5.5-9.1m Bedrock 75.83 20.62 0.39 0.20 -0.01 0.11 0.04

1907401 Bedrock 82.67 14.28 0.44 0.13 -0.01 0.06 0.01

5 Bedrock 80.23 17.90 0.44 0.22 -0.01 0.14 0.03

6 Bedrock 67.62 30.75 0.35 0.26 -0.01 0.14 0.04

7 Bedrock 83.09 13.19 0.50 0.23 -0.01 0.11 0.16

8 Bedrock 70.19 26.50 0.45 0.22 -0.01 0.13 0.03

9 Bedrock 81.76 15.10 0.51 0.15 -0.01 0.09 -0.01

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

Sample No. Na2O K2O P2O5 Loss Sum

DH1 0-3.5m 0.32 0.71 0.05 1.89 99.00

DH1 3.5-4.8m -0.10 0.20 0.03 1.14 99.00

DH2 0-1.1m -0.10 0.22 0.02 0.93 100.00

DH2 1.1-3.5m -0.10 0.18 0.07 1.02 99.00

DH2 3.5-5.5m -0.10 0.19 0.04 0.70 99.00

DH2 5.5-9.1m 0.16 0.28 0.04 1.21 99.00

1907401 -0.10 0.15 0.03 0.62 98.00

5 -0.10 0.38 0.03 0.97 100.00

6 -0.10 0.23 0.05 0.75 100.00

7 0.18 0.47 0.12 0.84 99.00

8 -0.10 0.18 0.05 0.81 98.00

9 -0.10 0.20 0.01 0.61 98.00

Era:	Proterozoic	Period:
Dating:		Method:
Genesis:	Regional metamorphic	Form:	Lens
Main texture:	Banded	Min. distribution:

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

	Abstract:
	A kyanite-quartzite south-east of Skei in Surnadal has been investigated by field sampling and core drilling with Pack Sack equipment. The 5-6 m thick layer, identified only in a single outcrop, has an average kyanite content of 30% according to analyses of the drill cores. The deposit has a near vertical plunge and the lateral extension is unknown, due to lack of outcrops.

	Abstract:
	Forkortet: This study represents an evaluation of Norwegian kyanite quartzite occurrences as potential deposits of high purity quartz raw material. Kyanite quartzites are rare fine-grained with 70 to 85 vol. % quartz and > 15 vol. % kyanite (Al2SiO5) which occur in Proterozoic supracrustal rock units. Kyanite quartzites form stratiform lens-shaped bodies, which can extend several kilometers.

Sample No.	Sample Type	Cu*	Zn*	Pb*	Co*	Ni*	As*	Ba*
1907401	Bedrock	-10	7	-10	8	-5	-5	399

Sample No.	Mo*	Ga*	S%	V*	Cr*	Th*	W*	Sr*	Y*
1907401	-5.00	-10.00	-.10	25	-10	8.00	31	5.0	-5.0

Sample No.	Zr*	Nb*	La*	Ce*	Pr*	Nd*	Sc*	Hf*
1907401	310	16.00	13.00	10.00	-10.00	-10.00	26.00	14.00

Sample No.	Sample Type	Mineral	Li	Be	B
1907401	Bedrock	Quartz	-1.000	-.400	-1.000
1907401	Bedrock	Quartz	-1.000	-.400	-1.000
1907401	Bedrock	Quartz	-1.000	-.400	-1.000

Sample No.	Na	Al	P	K	Ca	Ti	Mn	Fe	Ge
1907401	-20.000	14.000	-5.000	-.200	-15.000	8.000	-.100	-.400	.400
1907401	-20.000	13.900	-5.000	.490	-15.000	13.600	-.100	-.400	.400
1907401	-20.000	18.500	-5.000	-.200	-15.000	10.300	-.100	.400	.500

Sample No.	Sample Type	SiO2	Al2O3	TiO2	Fe2O3	MnO	MgO	CaO
DH1 0-3.5m	Bedrock	78.64	16.96	0.45	0.31	-0.01	0.11	0.05
DH1 3.5-4.8m	Bedrock	75.49	21.81	0.47	0.10	-0.01	0.11	0.02
DH2 0-1.1m	Bedrock	80.26	18.15	0.35	0.19	-0.01	0.09	0.02
DH2 1.1-3.5m	Bedrock	69.38	27.88	0.46	0.27	-0.01	0.11	0.07
DH2 3.5-5.5m	Bedrock	78.35	18.82	0.38	0.24	-0.01	0.10	0.05
DH2 5.5-9.1m	Bedrock	75.83	20.62	0.39	0.20	-0.01	0.11	0.04
1907401	Bedrock	82.67	14.28	0.44	0.13	-0.01	0.06	0.01
5	Bedrock	80.23	17.90	0.44	0.22	-0.01	0.14	0.03
6	Bedrock	67.62	30.75	0.35	0.26	-0.01	0.14	0.04
7	Bedrock	83.09	13.19	0.50	0.23	-0.01	0.11	0.16
8	Bedrock	70.19	26.50	0.45	0.22	-0.01	0.13	0.03
9	Bedrock	81.76	15.10	0.51	0.15	-0.01	0.09	-0.01

Sample No.	Na2O	K2O	P2O5	Loss	Sum
DH1 0-3.5m	0.32	0.71	0.05	1.89	99.00
DH1 3.5-4.8m	-0.10	0.20	0.03	1.14	99.00
DH2 0-1.1m	-0.10	0.22	0.02	0.93	100.00
DH2 1.1-3.5m	-0.10	0.18	0.07	1.02	99.00
DH2 3.5-5.5m	-0.10	0.19	0.04	0.70	99.00
DH2 5.5-9.1m	0.16	0.28	0.04	1.21	99.00
1907401	-0.10	0.15	0.03	0.62	98.00
5	-0.10	0.38	0.03	0.97	100.00
6	-0.10	0.23	0.05	0.75	100.00
7	0.18	0.47	0.12	0.84	99.00
8	-0.10	0.18	0.05	0.81	98.00
9	-0.10	0.20	0.01	0.61	98.00