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THE INDUSTRIAL MINERAL DATABASE | |||||
Deposit Area 1740 - 303 | |||||
(Last updated 26.feb.2004) |
Name of Deposit Area : Jengelfjell |
(Object Id : 1740,303,00,00) |
Location |
County : | Nord-Trøndelag (17) | Municipality : | Namsskogan (1740) |
Map 1:50000: | Majavatn (1925-3) | Map 1:250000: | Mosjøen |
Marking point: | Longitude: | 13.6103970 | Latitude: | 65.0917660 |
EU89-UTM Zone 33 | (Coordinates NOT confirmed) |
X-coord: | 434699 m. | Y-coord: | 7219400 m. |
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Commodity |
Main Type: | Olivine | Sub Type: | Ultramafic (unspec.) |
Importance |
Public: | Not Assessed (reg. 18.02.2015) |
Economical: | Not classified/evaluated |
Mineralization |
Era: | Period: | |||
Dating: | Method: | |||
Genesis: | Form: | |||
Main texture: | Min. distribution: |
Main grain size: |
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Plunge: |
Stratigraphic classification of host rock |
Era: | Period: |
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Bibliography: |
From NGU's Reference Archive: |
Foslie, S. , 1957 |
Namsvatnet med en del av Frøyningsfjell Geologisk kart. Berggrunnskart; Namsvatnet; 1:100 000; trykt i farger; NGU Publ.nr.196 |
;Norges geologiske undersøkelse;KART |
Foslie, Steinar; Strand, Trygve , 1956 |
Namsvatnet med en del av Frøyningsfjell. |
;Norges geologiske undersøkelse;KARTBESKRIVELSE; TIDSSKRIFTARTIKKEL;NGU; No.196;1-82 + fo pages |
Abstract: | |
The rocks of the area can be divided into three sharply separated groups. These are in ascending tectonic order: 1. The Børgefjell Massif in the north-eastern part of the area. 2. A complex of low-grade metamorphic sediments and volcanics. 3. A complex of high-grade metamorphic schists and gneisses in the west part of the area. The Børgefjell Massif is built up of granitic gneisses, porphyroblast schists rich in albite-oligoclase and micaschists, with subordinate bands of quartzite. There is a sharp tectonic boundary with a structural conformity to the overlying rocks. The Børgefjell Massif is thus a basal gneiss massif in the sense of Olaf Holtedahl. Probably its rocks are of pre-Cambrian age. The granitic gneisses and schists are in alternating, rather flat-lying sheets. East of Store Namsvatnet a beautiful anticlinal structure appears. |
Gustavson, Magne , 1973 |
Børgefjell. Beskrivelse til det berggrunnsgologiske gradteigskart J.19 - 1: 100 000 |
;Norges geologiske undersøkelse;KARTBESKRIVELSE; TIDSSKRIFTARTIKKEL;NGU; Skrifter; No.298 ; 8;43 + kart pages |
Abstract: | |
Three main structural units are present: 1. The Precambrian (Svecofennokarelian) basement of the Børgefjell Window. ". Low grade (greenschist facies) Lower Paleozoic rocks belonging to the Seve-Køli Nappe Complex. 3. The higher grade (amphibolite facies) Helgeland Nappe, thrust on top of the low grade rocks. The bedrock lithologies within these units are briefly described. Metasediments, metavolcanics and intrusive igneous rocks are present in the Caledonian part of the sequence. Within the Precambrian, granite and granitic gneiss predominate but metasediments and rocks transitional between gneisses and the metasediments are common. The stratigraphical position of the Caledonian rocks is briefly discussed. |
The fact sheet was created on 20.01.2025 |
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