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	Occurence 0 - 000 FEIL
	(Object Id: ) (Last updated: 23.01.2023)

Mineralization

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	Main texture:		Min. distribution:

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Stratigraphic classification of host rock

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From NGU's Reference Archive:

Bjørlykke, Arne; Bingen, Bernard; Billström, Kjell; Kooijman, Ellen , 2018

	The sandstone-hosted Osen lead deposit, Norway: new Pb isotope evidence for sourcing in the underlying granitoid basement

;Geological Society of Norway;ARTIKKEL;Norwegian journal of geology; No.98 (4);615-626 pages

Abstract:

The Osen deposit is one of several Pb–Zn deposits in Baltoscandia, hosted in Lower Cambrian sandstone, unconformably overlying a Precambrian granitoid basement and overlain by Caledonian nappes of the Lower Allochthon. In the Osen area, the Palaeoproterozoic Trysil granite (1673 ± 8 Ma) shows evidence of weathering below the unconformity. New Pb isotope data, collected by Laser Ablation Multi-Collector Inductively Coupled Plasma Mass Spectrometry (LA–MC–ICP–MS) on K-feldspar from six samples of the Trysil granite, provide an improved internally consistent model for the age and sourcing of the Osen deposit. Data spread along the published whole-rock errorchron of the Trysil granite form two populations. The least radiogenic of these, defined by a cluster of 10 data points (average 206Pb/204Pb = 16.51 and 207Pb/204Pb = 15.37), is interpreted to represent the initial ratio of the granite. Published isotope data of Pb in galena in the Osen deposit (20.24 < 206Pb/204Pb < 20.49, 15.85 < 207Pb/204Pb < 15.89) plot on a reference line including this K-feldspar cluster and whole-rock data of the Trysil granite, as it was c. 540 Myr ago. This distribution suggests that the Osen deposit was generated shortly after deposition of the sandstone in the Early Cambrian (c. 541–511 Ma). Lead was released by weathering of the granite basement during development of the sub-Cambrian peneplain. It therefore discards alternative models involving Caledonian events in either Ordovician or Silurian time.

Bjørlykke, Arne , 1983

	Sulphur isotope composition of the sandstone-lead deposits in southern Norway.

;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.380;143-158 pages

Abstract:

Samples of galena, pyrite and barite from the Norwegian sandstone-lead occurences in the Gjøvik area and at Osen and Galåa have been analyzed for their sulphur isotope composition. Samples from the Vassbo and Laisvall deposits in Sweden were also analyzed. The galena samples are characterized by a large variation in the sulphur isotopic composition (+10 to +16%.) and they have an average d34S composition of +18,56%. The sulphur source has earlier been interpreted to be oil-field waters, and these data are not inconsistent with this interpretation. However, the data also permit, as an alternative source for the sulphur, sea-water sulphate locally reduced by bacteria.

Bjørlykke, Arne , 1980

	Galena occurrences in Late Precambrian/Cambrian sandstones in Norway

;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.360;95-97 pages

Abstract:

Forkortet: Several occurrences of disseminated galena in Vendian/Lower Cambrian shallow marine sandstones of the Swedish Laisvall-type are known in Norway, most of them in the south-eastern part of the country between Snertingdal and the Swedish border. In the southern Norway lead mineralization occurs at several places in the Snertingdal area, the most promising of which is a zone 2 km in striloe length, up to 10 m thick, of approximately 1% Pb. The Pb/Zn ratio is on average 10:1. The base metal sulphides are accompanied by calcite. In this area the mineralization is always found in the upper orthoquartzitic part of the Vangsås Formation, which is parautochthonous. The mineralization at Galåa, between Osen and Snertindal, has many features in common with that of the Snertingdal area, but occurs at a somewhat lower stratigraphic level. In the Osen area, lead mineralization occurs within basal sandstone of Lower Cambrian age, lying directly on weathered Precambrian garnitic basement. The thickness of the basal sandstone is controlled by basement topography and ranges between 0,5 to 4 m and contains 1-5% Pb. Similar galena occurrences are found in the northern part of Norway, in Reisadal and Stabbursdal.

Bjørlykke, Arne , 1974

	BLYPROSJEKTET 1973. Samlerapport Osenfeltet, Åmot, Hedmark fylke.

;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.1172/3;5 pages

Abstract:

Rapporten gir en oversikt over Blyprosjektets undersøkelser i Osenfeltet: - Oppfølgende undersøkelser 1969 - Diamantboring og supplerende geokjemiske undersøkelser 1970 - IP-målinger 1972 - Diamantboring og supplerende IP-målinger 1973 I rapporten er det gitt en kort beskrivelse og vurdering av resultatene. Av konklusjonen går det fram at blymineraliseringen som opptrer langs nord- østsiden av Osensjøen er relativt rike, men små. Det er ikke funnet positive indikasjoner på en fortsettelse av mineraliseringen utenfor det hittil kjente området. Ytterligere malmundersøkelser i Osenfeltet kan derfor ikke anbefales. Undersøkelsene 1973 ble utført med støtte fra Hedmark fylke og Åmot kommune.

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