Blar i Artikler på emneord "ISOTOP"
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A note on the sulphur composition of chalcopyrite and pyrrhotite from the Moskogaissa mines, Birtavarre, Troms.
(NGU (203), Journal article, 1958)Under et besøk i Oslo sommeren 1956 var prof. A.M. Bateman (Yale Univ., USA) så vennlig a tilby å gjøre en bestemmelse av det stabile svovelisotop-forholdet i prøver fra Birtavarre. Håpet var at en slik bestemmelse kanskje ... -
Age determinations from the Iveland-Evje area, Aust-Agder.
(NGU (300), Journal article, 1973)A Rb\/Sr isochron age determination on intrusive granite and monzonite from the Iveland-Evje area gave an age of 1038+- 43 m.y. Biotite from the granite dated by the K\/Ar method gave an age of 845+-60 m.y. These values ... -
Caledonian granitoids in the Frøya-Froan area, central Norway.
(NGU Bulletin (427), Journal article, 1995) -
Isotopic composition, deposition ages and environemnts of Central Norwegian Caledonian marbles
(NGU Bulletin (427), Journal article, 1995) -
Isotopic evidence on the age of the Trysil porphyries and granites in eastern Hedmark, Norway.
(NGU (266), Journal article, 1970)Rocks from the (sub-Jotnian) acidic plutonic and volcanic basement complexes in the Trysil area, eastern Hedmark, yield a Rb-Sr isochron age of 1541+-69 million years. This agrees within the limits of error with the isochrom ... -
Lead isotope determinations by inductively-coupled plasma mass spectrometry (ICP-MS): potential of sector field instruments
(NGU Bulletin (436), Journal article, 2000)Lead isotope measurements have been carried out using a high-resolution inductively-coupled plasma mass spectrometry (Finnigan MAT ELEMENT, configurated with CD-1 option) The method can be applied to all types of geological ... -
Petrology and isotope geology of the Hunnedalen Monzonoritic Dyke Swarm, SW Norway: a possible late expression of Egersund Anorthosite magmatism
(NGU Bulletin (434), Journal article, 1998)The widest and northernmost dyke of the post-tectonic Late Proterozoic Hunnedalen Monzonoritic Dyke Swarm has been studied petrographically, chemically (major and trace element) and isotopically (Rb-Sr; Sm-Nd; K-Ar) toghether ... -
Rb-Sr isochron age of Caledonian acid volcanics at Stord, western Norway.
(NGU (300), Journal article, 1973)An eight-point Rb-Sr whole-rock isochron from Caledonianrhyolites at Stord in western Norway defines an age of 455 +- 5 m.y.and an initial 87Sr\/86Sr of 0.7071 +- 0.00018. This places thevolcanism in the Upper Ordivicium, ... -
Strontium isotope composition of the Bindal Batholith, Central Norwegian Caledonides
(NGU Bulletin (423), Journal article, 1992)Forkortet: A strontium isotope study of the Bindal Batholith has been carried out. The data generally do not permit precise and accurate age calculations; however, good estimates for initial Sr ratios are commonly obtained. ... -
Sulphur isotope composition of the sandstone-lead deposits in southern Norway.
(NGU (380), Journal article, 1983)Samples of galena, pyrite and barite from the Norwegian sandstone-lead occurences in the Gjøvik area and at Osen and Galåa have been analyzed for their sulphur isotope composition. Samples from the Vassbo and Laisvall ... -
The Oslo paleorift - A review and guide to excursions. Isotop- and trace-element chemistry, geochronology.
(NGU (337), Journal article, 1978)