Faktarka for <b>Registrering 1566 - 308 Tverrådalen</b>

					English version
	INDUSTRIMINERALDATABASEN
	Registrering 1566 - 308 Tverrådalen
	(Objekt Id: 17070) (Sist oppdatert: 14.10.2020)

Borkjerner: Tverrådalen

Lokalisering

Fylke:

Møre og Romsdal

Kommune:

Surnadal (1566)

Kart 1:50000:

Snota (1420-1)

Kart 1:250000:

Ålesund

Koordinatsystem:

EU89-UTM Zone 32

Øst:

492816 m.

Nord:

6978679 m.

Lengdegrad:

8.8584910

Breddegrad:

62.9379080

Kartvisning

Ressurs

Ressurstype:

Silika

Ressursundertype:

Kvartsitt

Betydning

Råstoffbetydning:

Liten betydning (reg. 18.02.2015)

Ressurser og produksjon

	Aktivitet:	Prospektering	Reserver:	2,5 tusen tonn
	Driftsmetode:		Historisk produksjon:

Mineralisering

Æra: Proterozoikum Periode:

Genese: Regionalmetamorf Form: Linse

Hovedtekstur: Båndet Min. fordeling:

Kornstørrelse: Finkornet (<1 mm)

Strøk/Fall: Retning:

Feltstupning:

Stratigrafisk klassifikasjon av vertsbergart

Æra: Periode:

Provins:

Geotek.enhet:

Tektonisk complex:

Intrusivt komplex:

Gruppe: Formasjon:

Opplysning(er) i fritekstformat

Fri tekst

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.

Bilde(r) fra forekomstområdet:

Foto nr. 1 viser "Outcrop of the Tverrådalenl kyanite quartzite"

Foto nr. 2 viser "Section of the Tverrådalen kyanite quartzite"

Foto nr. 3 viser "Micrograph of kyanite quartzite"

Litteraturfortegnelser:

Fra NGU's Referansearkiv.:

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 sider

Abstrakt:

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. sider

Abstrakt:

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.

Feltprøver

Prøvenr. Prøvetype Diverse

DH1 0-3.5m Fastfjell

Prøvetaker: Wanvik/...Lager: NGU

Kommentar: Kyanite-poor kyanite quartzite

Antall registrerte oksydanalyser = 1

DH1 3.5-4.8m Fastfjell

Prøvetaker: Wanvik/...Lager: NGU

Kommentar: Kyanite-rich kyanite quartzite

Antall registrerte oksydanalyser = 1

DH2 0-1.1m Fastfjell

Prøvetaker: Wanvik/...Lager: NGU

Kommentar: Kyanite-rich kyanite quartzite

Antall registrerte oksydanalyser = 1

DH2 1.1-3.5m Fastfjell

Prøvetaker: Wanvik/...Lager: NGU

Kommentar: Kyanite-rich kyanite quartzite

Antall registrerte oksydanalyser = 1

DH2 3.5-5.5m Fastfjell

Prøvetaker: Wanvik/...Lager: NGU

Kommentar: Kyanite-rich kyanite quartzite

Antall registrerte oksydanalyser = 1

DH2 5.5-9.1m Fastfjell

Prøvetaker: Wanvik/...Lager: NGU

Kommentar: Kyanite-rich kyanite quartzite

Antall registrerte oksydanalyser = 1

1907401 Fastfjell

Prøvetaker: Muller/...Lager: NGU

Kommentar: Kyanite-poor kyanite quartzite

Antall registrerte elementanalyser = 1

Antall registrerte mineralanalyer = 3

Antall registrerte oksydanalyser = 1

5 Fastfjell

Prøvetaker: Wanvik/...Lager: NGU

Kommentar: Kyanite-rich kyanite quartzite

Antall registrerte oksydanalyser = 1

6 Fastfjell

Prøvetaker: Wanvik/...Lager: NGU

Kommentar: Kyanite-rich kyanite quartzite

Antall registrerte oksydanalyser = 1

7 Fastfjell

Prøvetaker: Wanvik/...Lager: NGU

Kommentar: Kyanite-poor kyanite quartzite

Antall registrerte oksydanalyser = 1

8 Fastfjell

Prøvetaker: Wanvik/...Lager: NGU

Kommentar: Kyanite-rich kyanite quartzite

Antall registrerte oksydanalyser = 1

9 Fastfjell

Prøvetaker: Wanvik/...Lager: NGU

Kommentar: Kyanite-poor kyanite quartzite

Antall registrerte oksydanalyser = 1

NB! Alle analyseverdier er vist i slutten av utskriften.:

Analyseresultater

fra

Forekomstområde 1566 - 308 Tverrådalen

Elementanalyser
( *=parts pr. million, #=parts pr.billion, Negative verdier betyr under deteksjonsgrensen.)

Prøvenr. Prøvetype Cu* Zn* Pb* Co* Ni* As* Ba*

1907401 Fastfjell -10 7 -10 8 -5 -5 399

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

Prøvenr. Mo* Ga* S% V* Cr* Th* W* Sr* Y*

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

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

Prøvenr. Zr* Nb* La* Ce* Pr* Nd* Sc* Hf*

1907401 310 16.00 13.00 10.00 -10.00 -10.00 26.00 14.00

Mineralanalyser
( Alle verdier er i ppm. Negative verdier betyr under deteksjonsgrensen.)

Prøvenr. Prøvetype Mineral Li Be B

1907401 Fastfjell Kvarts -1.000 -.400 -1.000

1907401 Fastfjell Kvarts -1.000 -.400 -1.000

1907401 Fastfjell Kvarts -1.000 -.400 -1.000

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

Prøvenr. 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

Oksydanalyser
(Alle verdier er i %)

Prøvenr. Prøvetype SiO2 Al2O3 TiO2 Fe2O3 MnO MgO CaO

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

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

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

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

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

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

1907401 Fastfjell 82.67 14.28 0.44 0.13 -0.01 0.06 0.01

5 Fastfjell 80.23 17.90 0.44 0.22 -0.01 0.14 0.03

6 Fastfjell 67.62 30.75 0.35 0.26 -0.01 0.14 0.04

7 Fastfjell 83.09 13.19 0.50 0.23 -0.01 0.11 0.16

8 Fastfjell 70.19 26.50 0.45 0.22 -0.01 0.13 0.03

9 Fastfjell 81.76 15.10 0.51 0.15 -0.01 0.09 -0.01

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

Prøvenr. 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

Æra:	Proterozoikum	Periode:
Genese:	Regionalmetamorf	Form:	Linse
Hovedtekstur:	Båndet	Min. fordeling:

	Provins:
	Geotek.enhet:
	Tektonisk complex:
	Intrusivt komplex:

	Abstrakt:
	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.

	Abstrakt:
	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.

Prøvenr.	Prøvetype	Cu*	Zn*	Pb*	Co*	Ni*	As*	Ba*
1907401	Fastfjell	-10	7	-10	8	-5	-5	399

Prøvenr.	Mo*	Ga*	S%	V*	Cr*	Th*	W*	Sr*	Y*
1907401	-5.00	-10.00	-.10	25	-10	8.00	31	5.0	-5.0

Prøvenr.	Zr*	Nb*	La*	Ce*	Pr*	Nd*	Sc*	Hf*
1907401	310	16.00	13.00	10.00	-10.00	-10.00	26.00	14.00

Prøvenr.	Prøvetype	Mineral	Li	Be	B
1907401	Fastfjell	Kvarts	-1.000	-.400	-1.000
1907401	Fastfjell	Kvarts	-1.000	-.400	-1.000
1907401	Fastfjell	Kvarts	-1.000	-.400	-1.000

Prøvenr.	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

Prøvenr.	Prøvetype	SiO2	Al2O3	TiO2	Fe2O3	MnO	MgO	CaO
DH1 0-3.5m	Fastfjell	78.64	16.96	0.45	0.31	-0.01	0.11	0.05
DH1 3.5-4.8m	Fastfjell	75.49	21.81	0.47	0.10	-0.01	0.11	0.02
DH2 0-1.1m	Fastfjell	80.26	18.15	0.35	0.19	-0.01	0.09	0.02
DH2 1.1-3.5m	Fastfjell	69.38	27.88	0.46	0.27	-0.01	0.11	0.07
DH2 3.5-5.5m	Fastfjell	78.35	18.82	0.38	0.24	-0.01	0.10	0.05
DH2 5.5-9.1m	Fastfjell	75.83	20.62	0.39	0.20	-0.01	0.11	0.04
1907401	Fastfjell	82.67	14.28	0.44	0.13	-0.01	0.06	0.01
5	Fastfjell	80.23	17.90	0.44	0.22	-0.01	0.14	0.03
6	Fastfjell	67.62	30.75	0.35	0.26	-0.01	0.14	0.04
7	Fastfjell	83.09	13.19	0.50	0.23	-0.01	0.11	0.16
8	Fastfjell	70.19	26.50	0.45	0.22	-0.01	0.13	0.03
9	Fastfjell	81.76	15.10	0.51	0.15	-0.01	0.09	-0.01

Prøvenr.	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