Browsing NGU Open Archive by Subject "ORDOVICIUM"
Now showing items 1-11 of 11
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A compilation of previously published geochemical data on the lower Cambro-Silurian sedimentary sequence, including the alum shales of the Oslo region
(NGU-Rapport (2009.053), Report, 2009)As part of understanding the lithological variations of the exotic alum shales outcropping in the Oslo Rift (Fig.1), and how these represent different mineralogical, geochemical, and geomechanical properties, it is helpful ... -
A likely Early Ordovician age for the regional penetrative cleavage in the Gaissa Nappe Complex.
(NGU Bulletin (441), Journal article, 2003)Pervasively cleaved mudstones and claystones from two different parts of the Gaissa Nappe Complex in Finnmark wre subjected to Rb-Sr whole-rock analytical investigation. Although neither of the two groups of samples yielded ... -
Disparate geochemical patterns from Snåsavatn greenstone, Nord-Trøndelag, Central Norway.
(NGU (373), Journal article, 1982)Greenstone volcanites of Middle Ordovician age from the Snåsavatn area of the Central Norwegian Caledonides can be divided into two distinctive groups on the basis of their geochemical patterns. The bulk of the lavas sampled ... -
Geologi og petrografi på Nord-Karmøy.
(NGU (247), Journal article, 1967)The athor gives a description of rocks and tectonics on the northern and central part of the island of KarmThe athor gives a description of rocks and tectonics on the northern and central part of the island of Karmøy, ... -
Geology of the Folldal area, southern Trondheim Region Caledonides, Norway.
(NGU Bulletin (426), Journal article, 1994)The lowest stratigraphic unit in the Folldal area is the Gula Group, comprising turbidites and minor greenstones in the lower part (the Singsås Formation) and graphitic pelites with subordinate marble and conglomerate in ... -
Marginal basin type metavolcanites of the Hersjø Formation, eastern Trondheim District, Central Norwegian Caledonides.
(NGU Bulletin (412), Journal article, 1988)Forkortet.The more than 300 km long greenstone belt of the eastern Trondheim districtin the Caledonian Upper Allochthon displays considerable heterogeneity inlithology as well as metavolcanite geochemistry. A largely ... -
New data on Upper Ordovician conodonts from theTrondheim Region, Central Norwegian Caledonides
(NGU Bulletin (447), Journal article, 2007)A small collection of Upper Ordovician (Early-Mid Katian) conodonts has been recovered from low-grade meta-limestones in the K\u00F6li Nappes of the Upper Allochthon of the Trondheim Region, central Norway. For the Snåsavatnet ... -
Ordovician lithistid sponges and gastropods from the Snåsa limestone, Nord-Trøndelag, Norway
(NGU Bulletin (434), Journal article, 1998)Fossil occurring in the Snåsa Limestone, observed in new road-cuts along the main E6 road near Snåsavatnet, Nord-Trøndelag, are illustrated and briefly described. Although the effects of Scandian deformation and crystallisation ... -
Ordovician stratigraphy in the western Helgeland Nappe Complex in the Brønnøysund area, North-central Norway.
(NGU Bulletin (438), Journal article, 2001)In the western part of the Helgeland Nappe Complex, a small ophiolite fragment (the Bolvær Complex) and a metasedimentary succession (the Brønnøysund Group) are exposed on several islands to the west of Brønnøysund. The ... -
Preliminary investigations of some Ordovician volcanics from Stord, West Norway.
(NGU (327), Journal article, 1976)Later Ordovician volcanics on Stord, W. Norway, comprise alkaline rhyolite flows and ignimbrites, and ferro-basalt (icelandite) and basaltic andesite lavas. The latter are hy-normative, \"evolved\" rocks rich in residual ... -
Volcanostratigraphy and eruptive products of the Jonsvatn greenstone formation, central Norwegian Caledonides.
(NGU (387), Journal article, 1983)The predominantly volcanic, Ordovician, Jonsvatn greenstone formation comprises appr. 500 m of tholeiitic basalts and associated volcanic products, with interbedded sediments totalling some 100-200 m in thickness. In the ...