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	INDUSTRIMINERALDATABASEN
	Registrering 1806 - 329 Hesjetuva
	(Objekt Id: 7710) (Sist oppdatert: 15.10.2006)

Mineralisering

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	Hovedtekstur:		Min. fordeling:

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Stratigrafisk klassifikasjon av vertsbergart

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Opplysning(er) i fritekstformat

Fri tekst

Hesjetuva (also called "Sørfjorden") is situated only 400 m from the sea, at about 400 m above sea level. This lens has been visited by dimension stone experts from the Nidaros Cathedral a few years before 1940, but they did not find the stone suitable for their use. Hesjetuva was later visited by Hultin (1970) and subsequently by NGU (L.P.Nilsson) in 1978. Microscopic study of one of the 1978-samples shows a relatively fine-grained talc-carbonate rock composed of breunnerite (50-60 vol-%), talc (30-40%) and magnetite (3-5%).

Litteraturfortegnelser:

Fra NGU's Referansearkiv.:

Karlsen, Tor Arne; Nilsson, Lars Petter , 2000

	Talc deposits in Norway

;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.99.135;146 sider

Abstrakt:

Information about talc and soapstone deposits registered in NGU's different databases and various available literature have been collected and described in the present report. Around 400 deposits/occurrences are known, but the detail of the available information varies widely. By reading old field-books as well as old manuscripts, maps, etc. dating as far back as A.D.1758, quite a lot of data has been found. The result of the work shows that most described talc in Norway is of ultramafic origin and is associated with serpentinites. The most common mineral association is talc + breunnerite. Different talc-provinces can be defined from the registered and non-registered data, the most important being Nord-Gudbrandsdalen, Altermark and Stølsheimen. While Altermark and Stølsheimen have been investgated in some detail with respect to talc as an industrial mineral, the Nord-Gudbrandsdalen talc province has been investigated both for milling talc and for soapstone use as dimension stone. Deposits that are probably extensive, but have so far not been investigated in detail, include the Lesjehorrungane deposits in the Nord-Gudbrandsdalen region and the Raudfjellet deposit in Nord-Trøndelag. The fractionated metakomatiites (pale green talc-chlorite rocks) of the southern part of the Palaeo-proterozoic Karasjok Greenstone Belt in Finnmark, Northern Norway, possibly represents, by far, the largest accumulations of talc in Norway. These rocks are recently mapped, for the first time, but other critical information is, however, very scarce.

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Faktaarket ble generert 27.04.2024

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