Norsk versjon
	THE ORE DATABASE
	Occurence 5027 - 003 Rød
	(Object Id: 4210) (Last updated: 01.07.1998)

Operations

	From - To	Activity	Comments
	1997 - 1997	Sampling	Company/Institution :NGU-malmreg.

Mineralization

	Genesis:	Sedex	Form:	Lens
	Main texture:	Banded	Min. distribution:	Semi-massive (20-50 % ore minerals)

Main grain size:

Fine grained (< 1 mm)

Main alteration:

	Strike/Dip:	40 / 35	Direction:
			Plunge:

Stratigraphic classification of host rock

Era:

Period:

	Province:	Caledonides
	Geotec.unit:	Trondheim Nappe Complex
	Tectonic complex:	Gula Nappe
	Igneous complex:

Group:

Gula

Formation:

Singsås

Mineralogy

	Relationship	Mineral	Amount
	Gangue mineral	Graphite	Major mineral (>10%)
	Gangue mineral	Quartz	Major mineral (>10%)
	Gangue mineral	Biotite	Subordinate mineral (1-10%)
	Gangue mineral	Feldspar	Subordinate mineral (1-10%)
	Ore mineral	Pyrrhotite	Major mineral (>10%)
	Ore mineral	Pyrite	Subordinate mineral (1-10%)
	Ore mineral	Pyrargyrite	Accessory mineral (<1%)
	Ore mineral	Sphalerite	Accessory mineral (<1%)
	Ore mineral	Chalcopyrite	Accessory mineral (<1%)
	Ore mineral	Galena	Accessory mineral (<1%)

Lithology:

	Relationship	Rock	Origin
	Host rock	Black schist	Sedimentary Original rock :Bituminous silty mudstone
			Metamorphic facies :Greenschist

Structures

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Host rock	Foliation	Strike/Dip :40 / 35	Post-mineralisation ;...Effect :None

Information(s) in free text format

Description

Adkomst: Fra gården Rødsegga følges bekken oppover (østover) til kanten av ei stor myr, der en 20 m lang, NØ-SV-gående rygg (står opp pga. silifisering?) er blottet i nordenden av den lange N-S-løpende myra. Mineraliseringen forløper langs nordskråningen av ryggen, og har linsefortykning til 1.10 m mektighet i ryggens NØ-ende. Her er det sprengt litt (2 m3) i et lite skjerp. Den stratabundne sulfidmineraliseringen er knyttet til svartskifer med kvartsbånd. Den semimassive mineraliseringen er finbåndet, med finkornig magnetkis, samt noe svovelkis og spor av kobberkis anriket i smale, konkordante bånd. Det fins også noe grøvre (middelskornig) magnetkis i mm-mektige bånd, samt litt magnetkis som impregnasjon i kvartsbåndene. Det synes å være større frekvens av kvartsbånd langs hengkontakten. Hengbergart er samme kvartsbåndede grafittholdige svartskifer (men uten rust) som i mineraliseringen. I liggen er blottet 0.5 m mektig finlaminert grafittskifer. Mineraliseringen fortsetter langs kanten av ryggen mot SV, men går over i svakere disseminasjon. 25 m nord for skjerpet er det gravd litt like ved bekken - i gropa ses bare rusten oker. Videre 25 m mot NNØ (like ved et gjerde) er det avblottet en liten flekk og sprengt for prøvetaking i finlaminert svartskifer med mm-mektige magnetkisbånd (samme mineraliserte horisont). Mineraliseringen er altså fulgt over en lengde på 70 m i det ellers svært overdekte terrenget.

Bibliography:

From NGU's Reference Archive:

Nilsen, Odd , 1978

	Caledonian sulphide deposits and minor iron-formations from the southern Trondheim region, Norway.

;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.340;35-85 + k pages

Abstract:

Within the southern and central parts of the Trondheim region of the Norwegian Caledonides a great number of small, stratabound cupriferous pyrite deposits are confined to mafic metavolcanics of the Gula, Støren and Fundsjø Groups of the Lower Palaeozoic succession. The deposits occuring within, or in close contact with the metavolcanics are characterized by their association with minor manganiferous oxide/silicate iron-formations - better known as "vasskis" ore type - within the metamorphic low-grade areas. The iron-fprmations of the metamorphic higher grade terrains on the other hand, which are extensively developed within the Gula Group, are mostly of a pyrrhotitic sulphide/silicate type and sulphurization processes are thought to have played an important role during the metamorphism. The pyrite deposits occurring adjacent to the metavolcanics bear no relationship to the iron-formations. They are embedded in pelitic, often carbonaceous assemblages (Gula Group) or within tuffitic members of the volcanogene Støren Group, and they are thought to represent re-sedimented (reworked) deposits. The pyrite deposits display varying degree of metamorphic reconstitution and a tectonic control has apparently determined their disc- or ruler-shaped morphology.

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	ST0007.01	Dump	Sampler: Wilberg/...Stored: Løkken Comment: Svartskifer med semimassiv po(-py-cpy)-min. No. of registrated element analyses = 1
	ST0007.02	Dump	Sampler: Wilberg/...Stored: Løkken Comment: Svartskifer med semimassiv po(-py-cpy)-min. No. of registrated element analyses = 1

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

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Analyse Results

from

Deposit Area 5027 - 003 Rød

Element analyses

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

Sample No.	Sample Type	Cu*	Zn*	Pb*	Co*	Ni*	Ag*	Au#
ST0007.01	Dump	493	322	49	20	222	2.1	9.0
ST0007.02	Dump	386	142	20	25	177	1.3	3.0

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Sample No.	Pt#	Pd#	As*	Cd*	Ba*	Mo*	Sb*	Bi*	S%
ST0007.01	10.0	13.0	13	3.0	21	11.00	-3	4	11.80
ST0007.02	6.0	12.0	-2	1.7	15	28.00	-3	8	9.87

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Sample No.	V*	Cr*	Mn*	Fe%	Th*	U*	W*	Sr*	La*
ST0007.01	87	68	12259	21.25	6.00	-8.00	2	514.0	23.00
ST0007.02	45	30	638	17.13	6.00	9.00	5	17.0	12.00

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Sample No.	B*
ST0007.01	-3
ST0007.02	-3

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The fact sheet was created on 03.05.2024

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