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	INDUSTRIMINERALDATABASEN
	Forekomstområde 926 - 304
	(Sist oppdatert 07.okt.2025)

Betydning

Offentlig:

Not Assessed (reg. 18.02.2015)

Economical:

Ikke vurdert , (Confirmed 25.feb.2014 by Agnes Raaness)

Products

	Element/product	Crude ore grade or quality
	LIME	%

Mineralization

	Era:		Period:
	Dating:		Method:
	Genesis:		Form:
	Main texture:		Min. distribution:

Main grain size:

	Strike/Dip:		Direction:
			Plunge:

Stratigraphic classification of host rock

Era:

Proterozoic

Period:

	Province:	South Norwegian Basement Province
	Geotec.unit:	Agder Complex
	Tectonic complex:
	Igneous complex:

Group:

Formation:

Opplysning(er) i fritekstformat

Fri tekst

I følge Holtedahl (1917) kan kalksten påtreffes i åsen ca 300 m nordøst for Bronen. Her finnes et par små brudd hvor det er tatt ut stein til kalkbrenning ved Bjelland. Holtedahl beskriver kalksteinen som grovkornet, løs og uren. Den er uregelmessig, med steiltstående i et S-formet drag med hovedretning VNV. I det vestlige bruddet er strøket mot NNØ, og blottet mektighet er 5-6 m.

Beliggenhet

Stedsbeskrivelsen hos Holtedahl (1917) i åsen ca 300 m nordøst for Bronen kan tyde på at koordinatene på denne lokaliteten er noe feilplassert (ØSØ) for Bronen.

Bibliography:

From NGU's Reference Archive:

Holtedahl, Olaf , 1917

	II. Kalkstensforekomster paa Sørlandet.

;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.81;26 pages

Abstract:

In the present paper a description is given of the limestone-deposits of the Archean coast-region of southern Norway which, geologically, is very little studied. The majority of these deposits are found in the district shown in the accompanying map, where the limestone is marked by figures. The limestone belong to a sedimentary series, which is the oldest rock-system in this part of the country. Into this have been intruded large massives of granites and other igneous rocks, that together with crust movements have greatly altered the limestones. They are now more or less coarsely crystalline, often with minerals such as mica, quartz, augite, scapolite, as very frequent constituents, sometimes as fairly large, well developed crystals. The deposits are generally very small and a great many lie rather far into the country. The best situated ones, generally also showing the best quality of limestone, are found in some very small islands in the coast district between Grimstad and Lillesand. The chemical character of the limestone may be seen from analyses cited. Generally a rather large amount of amterial insoluable in hydrochloric acid is found, furthermore a fairly small amount of magnesia. The amount of calcium carbonate in the large quantity of the limestones is less than 90%. The practical use that can be made of these rocks is therefore generally very limited.

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Faktaarket ble generert 13.06.2026

Spørsmål eller kommentarer vedrørende faktaarket kan mailes til: ressursdatabaser@ngu.no

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