Fact Sheet for <b>Occurence 1837

					Norsk versjon
	THE INDUSTRIAL MINERAL DATABASE
	Occurence 1837 - 318 Ørnes
	(Object Id: 15006) (Last updated: 11.10.2010)

Location

County:

Nordland

Municipality:

Meløy (1837)

Map 1:50000:

Meløy (1928-4)

Map 1:250000:

Mo i Rana

Coordinate system:

EU89-UTM Zone 33

(Coordinates NOT confirmed)

East:

442600 m.

North:

7418500 m.

Longitude:

13.6899860

Latitude:

66.8790450

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Resource

Resource Type:

Olivine

Resource Subtype:

Ultramafic (unspec.)

Importance

Raw material meaning:

Not Assessed (reg. 18.02.2015)

Mineralization

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

Comment: This is a dummy sample that does not excists. The assosciated analyses have been compiled from various published and unpublished reports

No. of registrated oxide analyses = 1

NGUAK96063 Bedrock

Comment: This is a dummy sample that does not excists. The assosciated analyses have been compiled from various published and unpublished reports

No. of registrated oxide analyses = 1

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

Analyse Results

from

Deposit Area 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

	Genesis:		Form:
	Main texture:		Min. distribution:

	Province:
	Geotec.unit:
	Tectonic complex:
	Igneous complex:

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