English version
	INDUSTRIMINERALDATABASEN
	Forekomstområde 1837 - 318
	(Sist oppdatert 11.okt.2010)

Betydning

Offentlig:

Not Assessed (reg. 18.02.2015)

Economical:

Ikke vurdert

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:

Bucher-Nurminen, Kurt , 1988

	Metamorphism of ultramafic rocks in the Central Scandinavian Caledonides

;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;Special publication; No.3;86-95 pages

Abstract:

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.

Gustavson, M.; Skauli, H. , 1990

	Meløy. Berggrunnskart; Meløy; 19284; 1:50 000; sort/hvitt;

;Norges geologiske undersøkelse;KART

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

Sørensen, H. 1967: Metamorphic and metasomatic process in the formation of ultramafic rocks. In: Ultramafic and related rocks. Ed. P. J Wyllie. P 204-212.

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	NGUAK96062	Bedrock	Kommentar :Dette er en dummy prøve som ikke eksister. Den tilknyttede analyse er sammenstillt fra forskjellige publiserte og upubliserte rapporter. Disse er det ofte referet til i forekomstens referanser No. of registrated oxide analyses = 1
	NGUAK96063	Bedrock	Kommentar :Dette er en dummy prøve som ikke eksister. Den tilknyttede analyse er sammenstillt fra forskjellige publiserte og upubliserte rapporter. Disse er det ofte referet til i forekomstens referanser No. of registrated oxide analyses = 1

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

---

Analyse Results

from

Forekomstområde 1837 - 318 Ørnes

Oxide analyses

( All values are in % )

Sample No.	Sample Type	SiO2	Al2O3	TiO2	Fe2O3	MnO	MgO	CaO
NGUAK96062	Bedrock	42.50	0.84	0.00	10.70	0.15	38.20	0.19
NGUAK96063	Bedrock	46.80	0.74	0.00	7.30	0.15	22.90	13.58

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

Sample No.	Na2O	K2O	P2O5	Loss	Sum
NGUAK96062	0.03	0.28	0.00	6.74	100.00
NGUAK96063	0.32	0.02	0.00	6.98	99.00

---

Faktaarket ble generert 13.06.2026

Spørsmål eller kommentarer vedrørende faktaarket kan mailes til: ressursdatabaser@ngu.no

Copyright © 2026 Norges geologiske undersøkelse