Norsk versjon
THE INDUSTRIAL MINERAL DATABASE
Occurence 1578 - 304 Kallskardet
(Object Id: 7868)
(Last updated: 04.02.2004)

Location
County: Møre og Romsdal Municipality: Fjord (1578)
Map 1:50000: Tafjord (1319-3) Map 1:250000: Ålesund
Coordinate system: EU89-UTM Zone 32
East: 415952 m. North: 6899468 m.
Longitude: 7.3836860 Latitude: 62.2175870
Show on map

Resource
Resource Type: Olivine Resource Subtype: Olivine

Importance
Raw material meaning: Little Importance (reg. 18.02.2015)

Resources and production
Activity: Exploration Reserves:
Operating method: Historical production:


Mineralization
Genesis: Form:
Main texture: Min. distribution:
Main grain size:
Strike/Dip: Direction:
Plunge:
Stratigraphic classification of host rock
Era: Period:
Province:
Geotec.unit:
Tectonic complex:
Igneous complex:
Group: Formation:

Mineralogy
Mineral Amount
Olivine Major mineral (>90%)

Information(s) in free text format
Free text
Forekomsten ligger oppe i Kallskardet, rett ovenfor Tafjord sentrum. Her opptrer en dunittisk bergart sammen med eklogitt. Denne lokaliteten er fredet p.g.a sin mineralogi.

Bibliography:
From NGU's Reference Archive:
Brueckner, H.K. , 1977
A structural, stratigraphic and petrologic study of anorthosites, eclogites and ultramafic rocks and their country rocks, Tafjord area, western South Norway.
;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.332;1-53 + pl pages
Abstract:
The Tafjord area of the central basal gneiss region contains Caledonized metamorphic rocks divided into two groups. The 1000 m.y. old Fetvatn Geniss is a homogeneous zone of granodioritic gneiss that was intruded as part of a large plutonic complex during the Sveconorwegian Cycle. The heterogeneous Vikvatn Sequence contains obvious metasedimentary and metavolcanic rocks and is comprised of the Øyen, Øvste Rødal and Svartegga groups. In addition, anothosite, eclogite and anhydrous peridotite occur within the Øyen and Øvste Rødal groups. The quartizite-rich Svartegga group may form the basal (Eocambrian) part of the Caledonian supracrustal sequence typical of the eastern basal gneiss region. The Øyen and Øvste Rødal groups would then be Precambrian metasedimentary sequences seperated from the Svartegga group by a major unconformity. Structures include two early generations (F1A og F1B) of east-plunging, reclined, isoclinal, similar folds. Later (F2) folds generally have a concentric geometry, disharmonic profiles and variable axes. The F1 and F2 fabrics are identical to stuctures in the eastern basal geniss region that are believed to have formed during the Caledonian orogeny; but the F1A fabric may be a heterogeneous assemblage of Precambrian structures that were homogenized (Caledonized) during the intense F1B deformation.


The fact sheet was created on 20.10.2021

Questions or comments regarding the fact sheet can be emailed to:
ressursdatabaser@ngu.no
Copyright © 2021 Geological Survey of Norway