Fact Sheet for Deposit Area 817

					Norsk versjon
	THE INDUSTRIAL MINERAL DATABASE
	Deposit Area 817 - 307
	(Last updated 27.jul.2021)

Name of Deposit Area : Skardsfjellet

(Object Id : 0817,307,00,00)

The deposit area belongs to the Province : Tørdal pegmatittprovins

Location

County :

Telemark (08)

Municipality :

Drangedal (0817)

Map 1:50000:

Nissedal (1613-3)

Map 1:250000:

Skien

Marking point:

Longitude:

8.7133090

Latitude:

59.1868360

EU89-UTM Zone 32

(Coordinates NOT confirmed)

X-coord:

483618 m.

Y-coord:

6560891 m.

Commodity

Main Type:

Feldspar

Sub Type:

Pegmatitic feldspar

Importance

Public: Not Assessed (reg. 18.02.2015)

Economical: Not classified/evaluated

Operations

From - To Activity Comments

1941 - 1943 Pitting Skardsfjell ble drevet på amazonitt-feltspat under andre verdens krig.

Mineralization

Era: Proterozoic Period: Neoproterozoic

Dating: 893 (-9\+9) million year Method: U/Pb

Genesis: Pegmatite formation Form:

Main texture: Min. distribution:

Main grain size:

Strike/Dip: Direction:

Plunge:

Stratigraphic classification of host rock

Era: Proterozoic Period: Mesoproterozoic

Province: South Norwegian Basement Province

Geotec.unit: Telemark Supergroup

Tectonic complex:

Igneous complex:

Group: Formation:

Bibliography:

From NGU's Reference Archive:

Segalstad, Tom V.; Eggleston, Ted L. , 1993

Pegmatittene i Tørdal, Telemark.

;TIDSSKRIFTARTIKKEL;Stein; No.20 (3);190-195 pages

Bergstøl, S.; Juve, G. , 1988

Scandian ixiolite, pyrochlore and bazzite in granite pegmatite in Tørdal, Telemark, Norway. A contribution to the mineralogy and geochemistry of scandium and tin.

;Springer-Verlag;TIDSSKRIFTARTIKKEL;Mineralogy and petrology; No.38;229-243 pages

Abstract:

In Tørdal granite pegmatite veins cut through a volcano-sedimentary sequence which overlies an older, gneissic basement and younger granite from which they originate. Positive co-variations of scandium, lithium, beryllium and tin, which were documented through a recent prospecting program for tin, indicate a possible enrichment of scandium and tin during the passage of pegmatitic material through the volcanic sedimentary sequence. A description is given of scandium-rich ixiolite, (Ta,Nb,Sc,Sn,Fe,Mn,Ti)2O4 in association with pyrochlore, (Ca,Sc,Y,Sn,U)2(Ta,Nb,Ti)2O6(O,OH,F) and bazzite, Be3Sc2Si6O18 from a cleavelandite-amazonite pegmatite occurring as a part of a larger network of granitic pegmatite veins. Alteration from ixiolite to pyrochlore appears as a late magmatic-hydrothermal event.

References not to be found in NGU's Reference Archive.:

Steffenssen, G., Muller, A., Munnik, F., Friis, H., Erambert, M., Kristofferse, M., Rosing-Schow, N., 2020. Unusual scandium enrichments of the Tordal pegmatites, south Norway. Part I: Garnet as Sc exploration pathfinder. Ore Geology Reviews 126

Segalstad, T.V., Raade, G., 2003. Scandium mineralizations in southern Norway – geological background for the field trip. NGF Abstracts and Proceedings, No 2, p. 57-86.

Rosing-Schow, N., 2020. The Sveconorwegian pegmatite province: Identifying the parameters controlling the abundance and genesis of the pegmatites. Dissertation for the degree of Philosophiae Doctor, University of Oslo.

	From - To	Activity	Comments
	1941 - 1943	Pitting	Skardsfjell ble drevet på amazonitt-feltspat under andre verdens krig.

Era:	Proterozoic	Period:	Neoproterozoic
Dating:	893 (-9\+9) million year	Method:	U/Pb
Genesis:	Pegmatite formation	Form:
Main texture:		Min. distribution:

	Province:	South Norwegian Basement Province
	Geotec.unit:	Telemark Supergroup
	Tectonic complex:
	Igneous complex: