Norsk versjon
	THE ???? DATABASE
	Occurence 0 - 000 FEIL
	(Object Id: ) (Last updated: 08.05.2006)

Operations

	From - To	Activity	Comments
		Pitting	Company/Institution :?
	1990 - 1993	Detail mapping	Company/Institution :T. Bjerkgård, University of Oslo
	1999 - 1999	Sampling	Company/Institution :NGU mineralressurser

Mineralization

	Era:	Paleozoic	Period:	Ordovician
	Genesis:	Volcex	Form:
	Main texture:	Banded	Min. distribution:	Irregular (scattered)

Main grain size:

Fine grained (< 1 mm)

Main alteration:

Silicification

	Strike/Dip:		Direction:
			Plunge:

Stratigraphic classification of host rock

Era:

Paleozoic

Period:

Ordovician

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

Group:

Fundsjø

Formation:

Mineralogy

	Relationship	Mineral	Amount
	Gangue mineral	Quartz	Major mineral (>10%)
	Gangue mineral	Clinoamphibole	Major mineral (>10%)
	Gangue mineral	Chlorite	Major mineral (>10%)
	Gangue mineral	Garnet	Subordinate mineral (1-10%)
	Gangue mineral	Apatite	Accessory mineral (<1%)
	Gangue mineral	Muscovite	Accessory mineral (<1%)
	Ore mineral	Magnetite	Major mineral (>10%)
	Ore mineral	Pyrrhotite	Major mineral (>10%)
	Ore mineral	Chalcopyrite	Accessory mineral (<1%)
	Ore mineral	Pyrite	Accessory mineral (<1%)

Lithology:

	Relationship	Rock	Origin
	Wall rock	Chlorite-amphibole schist	Extrusive Original rock :Basalt
			Metamorphic facies :Greenschist
	Wall rock	Banded chlorite schist	Sedimentary Original rock :Tuffite
			Metamorphic facies :Greenschist

Structures

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Wall rock	Foliation	Strike/Dip :282 / 72	Post-mineralisation ;...Effect :Controls
	Wall rock	Fold axis	Dir./Plunge :295 / 53	Post-mineralisation ;...Effect :Modifies

Information(s) in free text format

Free text

Skjerpet ligger i tett granskog (plantefelt) omlag 300 m nord for gården Sørli og er ikke lett å finne. Det består av en grunn synk, 2.5 x 2.5 m vid og 3 m dyp. Tippvolumet er ca. 30 kbm. Mineralisering består vesentlig av magnetkis og magnetitt tilknyttet en finkornet, dels båndet kvartsitt, dvs. chert med mørk-grønn Fe-rik kloritt, gruneritt og granat. I skjerpet opptrer en sentralsone av magnetkis med underordnet magnetitt og spredt pyritt i en matriks av kvarts, kloritt og granat. Denne sonen er omlag 0.5 m mektig og er omgitt av magnetittrik kvartsitt. Magnetitt er i disse sonene anriket i bånd og slirer 1-10 cm mektige i mer ren chert. Pyritt er anriket i sonene mellom den sentrale magnetkis-dominerte sonen og de omgivende magnetittsonene. Hele den mineraliserte sonen er omlag 1 m mektig. I heng for mineraliseringen opptrer tuffittisk klorittskifer, mens en blotning 7 m i ligg for skjerpet består av kvarts-sericitt-klorittskifer med mm-store, spredte krystaller av magnetitt.

Bibliography:

From NGU's Reference Archive:

Bjerkgård, Terje , 1995

	The stratabound massive sulfide deposits in the Folldal area, southern Trondheim region Caledonides, Norway.

;UiO Geologisk fellesråd;AVHANDLING

Bjerkgård, Terje; Bjørlykke, Arne , 1994

	The stratabound sulphide deposits in the Folldal area, Southern Trondheim Region, Norway

;Norsk geologisk forening;TIDSSKRIFTARTIKKEL;Norsk geologisk tidsskrift; No.74 (4);213-237 pages

Abstract:

Frie emneord: Lagdelt, Malmgenese Five strata-bound massive sulphide deposits are situated at three different stratigraphic levels in the volcanogenic Fundsjø group in the Folldal area. The deposits are hosted in metabasalts, metarhyodacites and volcanoclastic rocks and belong to the Cu-Zn class of volcanic-associated massive sulphide deposits. The metal content of the deposits indicates that the sources of metals are underlying strata, possibly with a contribution from intrusives. Wall rock alteration varies according to differences in host rocks, and is probably a result of chemical variations of the host rocks, temperature differences and proximity to the hydrothermal vent. The clustering of deposits in the Folldal area is considered to be due to the occurrence of a large sub- volcanic trondhjemitic intrusion which acted as the major heat engine for convection. The small size of the deposits might be related to the shallow level of the intrusion.

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

Bjerkgård, T. & Bjørlykke A.,1996: Sulfide deposits in Folldal, Southern Trondheim Region Caledonides, Norway: Source of metals and wall-rock alterations related to host rocks. Economic Geology vol.91, p.676-696.

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	HE0067.01	Dump	Sampler: T. Bjerkgård/...Stored: Løkken/...Size(kg): 3 Comment: Masses of magnetite and pyrrhotite lenses in garnet-bearing chert. No. of registrated element analyses = 1
	HE0067.02	Dump	Sampler: T. Bjerkgård/...Stored: Løkken/...Size(kg): 3 Comment: Semimassive pyrrhotite with scattered porphyroblastic magnetite, bands of amphibole, garnet and chlorite. No. of registrated element analyses = 1
	HE0067.03	Dump	Sampler: T. Bjerkgård/...Stored: Løkken/...Size(kg): 3 Comment: Fine-grained quartz (chert) with irregular veins of magnetite. No. of registrated element analyses = 1

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

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The fact sheet was created on 03.05.2024

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