Blar i NGU Open Archive på emneord "OMVANDLING"
Viser treff 1-15 av 15
-
A probable Permian hydrothermal alteration age for a quartz syenite dyke from Stabben, Nordmøre.
(NGU Bulletin (432), Journal article, 1997)A Rb-Sr whole-rock isochron from a quartz-syenite dyke at Stabben, Nordmøre, has provided an age of 263 +- 6Ma. This could be taken to indicate a crystallisation age for the dyke, i.e. Early Permian. The age, however, does ... -
Fluorine-rich biotites and alkali-metasomatism as guided to massive sulphide deposits: an example from the Bleikvassli Zn-Pb-Ah-(CU) deposit, Norway
(NGU-Rapport (95.152), Report, 1995)Frie emneord: Sulfidmalmforekomst Fluorrike biotitter The Bleikvassli massive sulphide deposit is closely associated with a microcline gneiss interpreted as the metamorphosed equivalent of an alkaline magmatic rock of ... -
Fra Hardangervidden III
(NGU (34), Journal article, 1902)Forkortet: The border-lines on the southwestern and southern part of the map on p.29 are to be attributed to Mr.Bjørlykke, who had a very wild region to explore. His photo, reproduced on p.63, shows veins of granite in ... -
Geologiske og petrografiske undersøkelser i Modumfeltet.
(NGU (235), Journal article, 1966)Geological mapping of part of the Modum area, the northernmost part of the Kongsberg-Bamble area in the Precambrian of southern Norway, was carried out. The different rocks are described, and metasomatic processes which ... -
Granåsen, a dolomite-brucite deposit with potential for industrial development.
(NGU Bulletin (436), Journal article, 2000)Granåsen, situated close to Mosjøen in northern Norway, is a deposit containing several million tonnes of dolomite and brucite. The deposit has been investigated and characterised in preparation for future development and ... -
Industrial mineral quality of limestone; the effect of contact metemorphism on textural properties, brightness and geochemistry
(NGU Bulletin (436), Journal article, 2000)When carbonate are altered by contact metamorphism the industrial mineral quality of the rock can be affected. Based on two contrasting limnestone units from Oslo Rift, Norway, a study has been made of the impact that ... -
Metamorphic petrology of the Froland corundum-bearing rocks: the cooling and uplift history of the Bamble Sector, South Norway
(NGU Bulletin (424), Journal article, 1993)Corundum-bearing rocks from Kleggåsen, Froland, preserve metamorphic textures which reflect the cooling and uplift path of the Bamble Sector. The P-T path may be correlated with a T-t path constructed from published ages. ... -
Molybdenmineraliseringer under Elsjøfeltet. Geologisk logging av borhull 2, 129.30 - 216.40 m.
(NGU-Rapport (1900/16F), Report, 1982)Borhull 2 ble forlenget fra 129.30 til 216.40 m. Det viser at Elsjøfeltet intruderes av biotittgranitt fra undersida. I tillegg viser kjernen 4 andre finkornige intrusiver. Bergartene er propylittisk omvandlet i hele kjerne- ... -
Oppfølgende strukturmålinger i Tellnes-bruddet, Rogaland
(NGU-Rapport (99.137), Report, 2000)Fortrolig til 14.02.2007. På oppdrag fra Titania AS er det gjort oppfølgende undersøkelser av sprekker\/ forkastninger og omvandlingssoner i Tellnes-bruddet. Arbeidet er en oppfølging av tidligere arbeider hvor strukturer ... -
Status-report on talc-prospecting in Helgeland, northern Norway.
(NGU-Rapport (99.068), Report, 1999)A prospecting programme for talc has been carried out in Helgeland. The results are both good and bad; a new talc deposit has been found in Kvanndalen, a few km west of Altermark. The deposit are exposed, and the size is ... -
Supergene alteration of Norwegian Sulphide deposits - a query.
(NGU (213), Journal article, 1961)Forfatteren diskuterer en tidligere avhandling av Bjørlykke som behandler spørsmålet om supergene anrikninger i norske kisforekomster. Bjørlykkes forslag er at anrikninger av kobber, utelukkende som kobberkis (kalkopyrit), ... -
Tectonic setting of the Tronfjell Massif ; further evidence for pre-Scandian orogenesis in the Trondheim Nappe Complex, Central Norway.
(NGU Bulletin (434), Journal article, 1998)The Tronfjell Massif consists of layered mafic intrusion, containing dunites and olivine-bearing to noritic gabbros, lying within metasedimentary rocks of the Hummelfjell Group. The initially more or less flat form of the ... -
The precambrian metamorphic rocks around the lake Vegår (Aust-Agder, southern Norway).
(NGU (257), Journal article, 1968)An area about 2000 km between the Skagerak coast (Tvedestrand - Risør) and the Southern part of the Telemark province (Tjønefoss - Neslandvatn) has been investigated and is considered to be a genetically homogenous migmatitic ... -
Velfjord. Beskrivelse til det berggrunnsgeologiske gradteigskart I 18 - 1:100 000.
(NGU; Skrifter (274; 1), Journal article, 1972)The various lithologies are described. These comprise granitic basements rocks of supposed Pre-Cambrian age and Cambro-Silurian supracrustals and intrusives. The intrusives are mostly found within the Bindal and Velfjord ... -
Ødegården rutilforekomst: En rutilførende skapolittomvandlet gabbro ved Ødegårdens Verk, Bamble
(NGU-Rapport (93.078), Report, 1993)Ødegården rutilforekomst utgjør en langstrakt sone av rutilførende skapolitt- hornblende bergart (ødegårditt) som gjennomsettes av opptil 1 m mektige ganger av en flagopitt - enstatitt - apatitt bergart. Forekomsten er ...