Blar i Artikler på emneord "DATERING"
Viser treff 41-48 av 48
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Timing and tectonic significance of Sveconorwegian A-type granitic magmatism in Telemark, southern Norway: New results from laser-ablation ICPMS U-Pb dating of zircon
(NGU Bulletin (447), Journal article, 2007)The ages of six Sveconorwegian A-type granites without penetrative deformational fabric and an intrusive rhyolite porphyry from Telemark, southern Norway, have been determined by laser ablation inductively coupled plasmasource ... -
Timing of late- to post-tectonic Sveconorwegian granitic magmatism in South Norway.
(NGU Bulletin (440), Journal article, 2002)Dating of late- to post-tectonic Sveconorwegian granitic intrusions from South Norway by the SIMS U-Pb method on zircons and by internal Pb-Pb isochrons on rock-forming minerals indicates a major event of granitic magmatism ... -
U-Pb age dating and paleotectonic significance of trondhjemite from the type locality in the Central Norwegian Caledonides
(NGU Bulletin (437), Journal article, 2000)Zircon and titanite U-Pb data are reported from the trondhjemite type locality at Follstad, near Støren in Central Norway. A concordant fraction of aricular zircon and an overlapping fraction of titanite give an age of ... -
U-Pb geochronology and geochemistry of trondhjemites and norite pluton from the SW Trondheim Region, Central Norwegian Caledonides
(NGU Bulletin (441), Journal article, 2003)Zircon analyses from two trondhjemites and a biotite norite from a part of the southwestern Trondheim Region have yielded almost identical Early Silurian ages. The biotite norite and one of the trondhjemites, from a quarry ... -
U-Pb zircon age of 469 +- 5 Ma for a metatonalite from the Kjosen Unit of the Lyngen Magmatic Complex, northern Norway
(NGU Bulletin (428), Journal article, 1995)Two fractions of zircon from a tectonised tonalite from within metagabbro of the Kjosen Unit of the Lyngen Magmatic Complex give a concordant U-Pb age of 469 +- 5 Ma. This is interpreted as a minimum age for the Kjosen ... -
U-Pb zircon age of a dolerite dyke from near Hamningberg,Varanger Peninsula, North Norway, and its regional significance
(NGU Bulletin (432), Journal article, 1997)A dolerite dyke cutting very low-grade metasedimentary rocks of the Løkvik- fjellet Group near Hamningberg, NE Varanger Peninsula, Finnmark, has yielded a U-Pb zircon upper intercept age of 567,1 +30\/23 Ma. This ... -
U-Pb zircon age of the Møklevatnet granodiorite, Gjersvik Nappe, Central Norwegian Caledonides
(NGU Bulletin (421), Journal article, 1991)The Møklevatnet granodiorite in the Gjersvik Nappe has yielded a U-Pb zircon age of 456 +- 2MA from three, concordant, mulitigrain fractions. This can also be regarded as a maximum age, Early Middle Caradoc, for the oldest ... -
U-Pb zircon ages of a tonalite and a granodiorite dykefrom the southeastern part of the Bindal Batholith,central Norwegian Caledonides
(NGU Bulletin (446), Journal article, 2006)An elongate tonalite pluton and a c.10 m-thick granodiorite body in the southeastern part of the Bindal Batholithand Helgeland Nappe Complex, Nord-Trøndelag, have yielded U-Pb zircon ages of 429 \u00B12 and 430 \u00B12 Ma, ...