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INDUSTRIMINERALDATABASEN
Registrering 1813 - 316 Bolvær
(Objekt Id: 14979)
(Sist oppdatert: 08.07.2010)

Lokalisering
Fylke: Nordland Kommune: Brønnøy (1813)
Kart 1:50000: Brønnøysund (1725-1) Kart 1:250000: Mosjøen
Koordinatsystem: EU89-UTM Zone 33 (Koordinatene IKKE bekreftet)
Øst: 364500 m. Nord: 7265999 m.
Lengdegrad: 12.0722540 Breddegrad: 65.4880550
Kartvisning

Ressurs
Ressurstype: Olivin Ressursundertype: Ultramafitt (uspes.)

Betydning
Råstoffbetydning: Ikke vurdert (reg. 18.02.2015)


Mineralisering
Æra: Paleozoikum Periode:
Genese: Form:
Hovedtekstur: Min. fordeling:
Kornstørrelse:
Strøk/Fall: Retning:
Feltstupning:
Stratigrafisk klassifikasjon av vertsbergart
Æra: Paleozoikum Periode:
Provins:
Geotek.enhet:
Tektonisk complex:
Intrusivt komplex:
Gruppe: Formasjon:

Litteraturfortegnelser:
Fra NGU's Referansearkiv.:
Heldal, T.; Hjelmeland, H. , 1988
Brønnøysund. Berggrunnskart; Brønnøysund; 17251; 1:50 000; sort/hvitt;
;Norges geologiske undersøkelse;KART

Heldal, Tom , 2001
Ordovician stratigraphy in the western Helgeland Nappe Complex in the Brønnøysund area, North-central Norway.
;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU Bulletin; No.438;47-61 sider
Abstrakt:
In the western part of the Helgeland Nappe Complex, a small ophiolite fragment (the Bolvær Complex) and a metasedimentary succession (the Brønnøysund Group) are exposed on several islands to the west of Brønnøysund. The Bolvær Complex was emplaced, uplifted and subject to subaerial weathering and erosion prior to the deposition of the Brønnøysund Group. The uncomformity defines an irregular topographic surface which was gradually filled with sediments during a regional transgression, probably influenced by active tectonics. The sedimentation of the Brønnøysund Group initially started with the build-up of a coastal setting, delivering coarse and fince clastiscs into a shallow-marine environment (Risøy Formation). This formation is stratigraphically overlain by calcareous turbidites (Torgnes Formation), pelites (Aspøy Formation) and carbonate rocks (Toftsund Formation). The Brønnøysund Group is correlated with several cover sequences above ophiolites in the Helgeland Nappe Complex, and deposition in Early to Middle Orodovician time is suggested. The clast population in conglomerates and the composition of finer clastic sediments show an exotic, ensialic source for the detritus, in addition to the ophiolite. The ensialic source consisted essentially ofpsammites and schists, deformed and metamorphosed prior to the deposition of the Brønnøysund Group.


Faktaarket ble generert 24.09.2021

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