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INDUSTRIMINERALDATABASEN
Registrering 1837 - 315 Kobbetuva
(Objekt Id: 15003)
(Sist oppdatert: 25.02.2004)

Lokalisering
Fylke: Nordland Kommune: Meløy (1837)
Kart 1:50000: Svartisen (1928-2) Kart 1:250000: Mo i Rana
Koordinatsystem: EU89-UTM Zone 33 (Koordinatene IKKE bekreftet)
Øst: 450599 m. Nord: 7400899 m.
Lengdegrad: 13.8797370 Breddegrad: 66.7225950
Kartvisning

Ressurs
Ressurstype: Olivin Ressursundertype: Ultramafitt (uspes.)

Betydning
Råstoffbetydning: Ikke vurdert (reg. 18.02.2015)


Mineralisering
Genese: Form:
Hovedtekstur: Min. fordeling:
Kornstørrelse:
Strøk/Fall: Retning:
Feltstupning:
Stratigrafisk klassifikasjon av vertsbergart
Æra: Periode:
Provins:
Geotek.enhet:
Tektonisk complex:
Intrusivt komplex:
Gruppe: Formasjon:

Litteraturfortegnelser:
Fra NGU's Referansearkiv.:
Bucher-Nurminen, Kurt , 1988
Metamorphism of ultramafic rocks in the Central Scandinavian Caledonides
;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;Special publication; No.3;86-95 sider
Abstrakt:
Lenses and boudins of ultramafic rocks in the Central Scandinavian Caledonides (CSC) represent parts of dismembered ophiolite sequences and fragments of sub- continental upper mantle. The metaperidotites are isofacial with the metamorp- hic envelope, usually metasediments but in place also metagranitoids. Metamorphic assemblages in metaperidotites of the CSC, together with additional geological constraints, define a regional metamorphic gradient of prograde metamorphism which passes through the approximate PT-coordinates (in C and kbars): 400/4, 500/6, 600/8, 700/9. The sequence of prograde metamorphic assemblages is (with increasing temperature): antigorite+brucite, antigorite+ forsterite, forsterite+talc, forsterite+enstatite+chlorite, and forsterite+ enstatite+green spinel. The maximum temperature was not sufficient to replace calcic amphibole by calcic pyroxene. Pargasite overgrowth on earlier tremolite demonstrates the prograde nature of the metamorphism. Most of the ultramafic rocks probably represent progresively metamorphosed serpentinites (mantle-or crustal serpentinites?). The regional distribution of assemblages in the ultramafic rocks of the CSC defines a regular pattern which cross-cuts the nappe boundaries of the area.

Johnsen, S.O. , 1983
Svartisen. Berggrunnskart; Svartisen; 19282; 1:50 000; sort/hvitt;
;Norges geologiske undersøkelse;KART


Faktaarket ble generert 28.03.2024

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