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	THE ORE DATABASE
	Deposit Area 919 - 007
	(Last updated 30.nov.2015)

Importance

Public:

Little Importance (reg. 04.05.2015)

Economical:

Not classified/evaluated , (Confirmed 05.mai.2015 by Julian Schilling)

Mineralization

	Era:	Proterozoic	Period:	Neoproterozoic
	Dating:	1060 million year	Method:
	Genesis:	Pegmatite formation	Form:
	Main texture:		Min. distribution:

Main grain size:

Main alteration:

	Strike/Dip:		Direction:
			Plunge:

Stratigraphic classification of host rock

Era:

Period:

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

Group:

Formation:

Mineralogy

	Relationship	Mineral	Amount
	Gangue mineral	Quartz	Major mineral (>10%)
	Gangue mineral	Albite	Major mineral (>10%)
	Gangue mineral	Plagioclase	Major mineral (>10%)
	Gangue mineral	Muscovite	Major mineral (>10%)
	Ore mineral	Xenotime	Accessory mineral (<1%)
	Ore mineral	Samarskite	Accessory mineral (<1%)
	Ore mineral	Monazite	Accessory mineral (<1%)
	Ore mineral	Allanite	Accessory mineral (<1%)

Lithology:

	Relationship	Rock	Origin
	Host rock	granite pegmatite	Intrusive Original rock :Granite pegmatite

Information(s) in free text format

Free text

The Bjortjenn location comprises a partly mined granitic pegmatite with a core consisting of massive quartz and plagioclase. Locally, the pegmatite underwent intensive muscovitisation and albitisation.

Bibliography:

From NGU's Reference Archive:

Müller, Axel ; Ihlen, Peter ; Kronz, Andreas , 2006

	Potential resources of quartz and feldspar raw material in Sørland IV: Relationships between quartz, feldspar and mica chemistry and pegmatite type

;Norges geologiske undersøkelse;RAPPORT;NGU-rapport; No.2005.075;94 s. pages

Abstract:

Forkortet: The Sveconorwegian pegmatite fields of Froland and Herefoss is located at the western edge of the Bamble terrane in southern Norway. The field comprises different pegmatite types which can be roughly classified as follows: (1) PGr - pegmatitic granites, (2) GP - granite pegmatites, (3) NaP - Plagioclase-dominant granitic pegmatites, (4) ZoP - zoned granitic pegmatites, (5) KP - K-feldspar-dominant granitic pegmatites, (6) PD - muscovites pegmatite/granite dykes and (7) HP - zoned pegmatites related to the Herefoss pluton. Types (1) to (5) and (7) represent relative primitive pegmatites in respect to granitic differentation containing predominantly Fe phlogopite and Mg siderophyllite. Type (6) has an more evolved chemistry reflected by zinnwaldite.

Müller, Axel; Kearsley, Anton; Spratt, John; Seltmann, Reimar , 2012

	Petrogenetic implications of magmatic garnet in granitic pegmatites from southern Norway

;Mineralogical Association of Canada;ARTIKKEL;Canadian mineralogist; No.50 (4);1095-1115 pages

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	62370	Bedrock	Comment :"Bjortjørn No. of registrated element analyses = 1 No. of registrated oxide analyses = 1

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

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Analyse Results

from

Deposit Area 919 - 007 Bjortjørn

Element analyses

( *=parts pr. million, #=parts pr.billion, Negative values means below detection limit value.)

Sample No.	Sample Type	Cu*	Zn*	Pb*	Co*	Ni*	Ba*	Mo*
62370	Bedrock	2	1	10	1	3	19	2.50

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Sample No.	Sn*	Ga*	Th*	U*	W*	Rb*	Sr*	Y*	Zr*
62370	9	29.60	13.80	13.70	1	100.8	46.6	47.3	13

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Sample No.	Nb*	Ta*	Cs*	La*	Ce*	Pr*	Nd*	Sm*	Eu*
62370	24.00	2.60	2.10	12.50	33.30	4.44	18.40	5.94	0.23

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Sample No.	Gd*	Tb*	Dy*	Ho*	Er*	Tm*	Yb*	Lu*	Be*
62370	5.52	1.16	6.59	1.30	3.87	0.68	4.61	0.68	8

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Sample No.	Sc*	Hf*
62370	6.00	1.30

Oxide analyses

( All values are in % )

Sample No.	Sample Type	SiO2	Al2O3	TiO2	Fe2O3	MnO	MgO	CaO
62370	Bedrock	74.89	15.02	0.02	0.47	0.01	0.09	1.56

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Sample No.	Na2O	K2O	P2O5	Loss	Sum
62370	5.37	2.09	0.02	0.40	100.00

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The fact sheet was created on 16.05.2024

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