English version
INDUSTRIMINERALDATABASEN
Registrering 5006 - 307 Sparbu
(Objekt Id: 15094)
(Sist oppdatert: 26.02.2004)

Lokalisering
Fylke: Trøndelag Kommune: Steinkjer (5006)
Kart 1:50000: Stiklestad (1722-4) Kart 1:250000: Namsos
Koordinatsystem: EU89-UTM Zone 32 (Koordinatene IKKE bekreftet)
Øst: 619499 m. Nord: 7091249 m.
Lengdegrad: 11.4373180 Breddegrad: 63.9277790
Kartvisning

Ressurs
Ressurstype: Olivin Ressursundertype: Ultramafitt (uspes.)

Betydning
Råstoffbetydning: Ikke vurdert (reg. 18.02.2015)


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

Litteraturfortegnelser:
Fra NGU's Referansearkiv.:
Mortenson, M. , 1973
Talk-serpentinforekomster i Sparbu, Nord-Trøndelag.
;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; Skrifter; No.290; 4;1-16 sider
Abstrakt:
The report presents a technical description of certain talc-serpentine deposits occuring within the Gula Schist Group (Cambrian) of the Trondheim region. No form of contact metamorphism of the schist can be observed along the serpentinite contacts. Some of the serpentinites are strongly brecciated, and cemented by secondary magnesite. Border zones consisting of talc, magnesite and chlorite occur in this type. Non-brecciated serpentinite bodies show no, or very narrow, secondary border zones. The talc-magnesite zones are considered to have formed from antigorite by reaction with CO2-rich hydrothermal fluids. Antigorite was attacked by these solutions along the breccia fissures, with the resultant formation of magnesite, which fills the cracks and replaces the massive serpentine. This alteration caused a considerable increase in volume, so that newly-formed talc and magnesite were squeezed out of the serpentinite body to form the border zones. In addition to CO2, the hydrothermal solutions carried K, together with traces of B, F and Rb. Aggregates of coarsely crystalline smaragdite, and some Cr-free secondary magnetite are found in the talc zone. The serpentine body contains Cr-bearing magnetite as well as some Ni, partly as sulphides but mostly contained in Mg-silicates. This Ni reappears in the newly-formed talc-magnesite, and in pentlandite.

Roberts, D. , 1997
Stiklestad. Foreløpig berggrunnsgeologisk kart.; Stiklestad; 17224; 1:50 000;
;Norges geologiske undersøkelse;KART


Faktaarket ble generert 27.09.2021

Spørsmål eller kommentarer vedrørende faktaarket kan mailes til:
ressursdatabaser@ngu.no
Copyright © 2021 Norges geologiske undersøkelse