Fact Sheet for Deposit Area 1739

					Norsk versjon
	THE INDUSTRIAL MINERAL DATABASE
	Deposit Area 1739 - 303
	(Last updated 26.feb.2004)

Name of Deposit Area : Rokkeklumpen

(Object Id : 1739,303,00,00)

Location

County :

Nord-Trøndelag (17)

Municipality :

Røyrvik (1739)

Map 1:50000:

Jomafjellet (1924-1)

Map 1:250000:

Grong

Marking point:

Longitude:

13.7725570

Latitude:

64.9904290

EU89-UTM Zone 33

(Coordinates NOT confirmed)

X-coord:

442100 m.

Y-coord:

7207949 m.

Commodity

Main Type:

Olivine

Sub Type:

Ultramafic (unspec.)

Importance

Public: Not Assessed (reg. 18.02.2015)

Economical: Not classified/evaluated

Mineralization

Era: Period:

Dating: Method:

Genesis: Form:

Main texture: Min. distribution:

Main grain size:

Strike/Dip: Direction:

Plunge:

Stratigraphic classification of host rock

Era: Period:

Province:

Geotec.unit:

Tectonic complex:

Igneous complex:

Group: Formation:

Bibliography:

From NGU's Reference Archive:

Oxaal, John , 1910

IV. Fjeldbygningen i den sydlige del av Børgefjeld og trakterne om Namsvandene

;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.53;26 pages

Abstract:

Forkortet: The region described is situated in the northern part of the Northern Trondheim region. The most dominent eruptive masses within this region are three great granite areas, of which one is situated to the West and one to the East of Nam- dalen. The third granite area, in store Børgefjell and southward to Namsvatnet. is the oldest. The granite is injected between the strata of mica schists; the eruption has been taken place before the beginning of the folding and the rocks have been metamorphosed in part very thoroughly. The margin of the granite mass has been transformed into granite, schists, the more central parts show much less effects of pressure and appear now as a porphyritic gneiss. The author found at several places a gradual transition from the granite schists to the porphyritic gneiss. A series of microphotographs of sections taken from a transition series is reprodused on the appended sheet.

Foslie, S. , 1957

Namsvatnet med en del av Frøyningsfjell Geologisk kart. Berggrunnskart; Namsvatnet; 1:100 000; trykt i farger; NGU Publ.nr.196

;Norges geologiske undersøkelse;KART

Foslie, Steinar; Strand, Trygve , 1956

Namsvatnet med en del av Frøyningsfjell.

;Norges geologiske undersøkelse;KARTBESKRIVELSE; TIDSSKRIFTARTIKKEL;NGU; No.196;1-82 + fo pages

Abstract:

The rocks of the area can be divided into three sharply separated groups. These are in ascending tectonic order: 1. The Børgefjell Massif in the north-eastern part of the area. 2. A complex of low-grade metamorphic sediments and volcanics. 3. A complex of high-grade metamorphic schists and gneisses in the west part of the area. The Børgefjell Massif is built up of granitic gneisses, porphyroblast schists rich in albite-oligoclase and micaschists, with subordinate bands of quartzite. There is a sharp tectonic boundary with a structural conformity to the overlying rocks. The Børgefjell Massif is thus a basal gneiss massif in the sense of Olaf Holtedahl. Probably its rocks are of pre-Cambrian age. The granitic gneisses and schists are in alternating, rather flat-lying sheets. East of Store Namsvatnet a beautiful anticlinal structure appears.

Fossen, H.; Kollung, S. , 1988

Jomafjellet. Berggrunnskart; Jomafjellet; 19241; 1:50 000; sort/hvitt;

;Norges geologiske undersøkelse;KART

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	Igneous complex: