Blar i Artikler på emneord "GNEIS"
Viser treff 1-20 av 25
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A new Rb-Sr isotopic parameter for metasomatism, At, and its application in study of pluri-fenitized gneisses around the Fen ring complex.
(NGU Bulletin (445), Journal article, 2005)Emplacement of the Fen peralkaline-carbonatitic ring complex 583 Ma ago in the c. 1105 Ma old Telemark gneisses caused mineralogical, chemical and Sr-isotopic changes, i.e., fenitization, in the country rocks. Fenitization ... -
A possible basement to the Mesoproterozoic quartzites on Hardangervidda, South-Central Norway: zircon U-Pb geochronology of a migmatitic gneiss
(NGU Bulletin (437), Journal article, 2000)On Hardangrvidda west of the Mandal-Ustaoset fault zone in South Norway, some 80-90% of the crust consists of orthogneisses and foliated and massive granites in this plutonic environment the Mesoproterozoic quartzites of ... -
Basement Gneiss doming the Uppermost Allochthon in the Bogøy area of Steigen, Nordland, Norway.
(NGU Bulletin (414), Journal article, 1989)Steigen lies geographically within the Uppermost Allochthon, which was emplacedduring the Scandian phase of the Caledonian orogeny. A tectonized boundaryseparates a basement culmination of Precambrian granite-gneisses from ... -
Contributions to the geology of Hardangervidda (West Norway) I. An explosion-breccia occurrence in Hjølmodalen.
(NGU (247), Journal article, 1967)An occurrence of breccia, which is thought to have been formed\rby a fluidization process, is described. The breccia is supposed to be\rgenetically related to similar breccias encountered in other parts of\rthe Precambrian ... -
Det nordvestlige gneis-område i det sydlige Norge, aldersforhold og tektonisk-stratigrafisk stilling.
(NGU (184), Journal article, 1953) -
Economic potential of potassic feldpar-rich gneisses in Tysfjord/ Hamarøy, northern Norway
(NGU Bulletin (436), Journal article, 2000)Potassic feldspar gneiss in the Tysfjord\/Hamarøy area may be potential resource for future exploitation. The rock consists primarily of microcline (up to 84%) and quartz (up to 35%) together with small amounts of plagioclase ... -
En geologisk undersøkelse på den nordvestlige del av kartblad Børgefjell.
(NGU (211), Journal article, 1960)A geological investigation of the Caledonid of the Majavatn-Kvigtindregion, Nordland, Norway. The northwestern part of the map area Børgefjell, Nordland, was investigated during the summers of 1957 and 1958, seven weeks ... -
En hornblenderik sone i Seiland-peridotitten. Foreløbig meddelelse.
(NGU (188), Journal article, 1954)A hornblende-rich zone in the peridotite of Seiland: In the island of Seiland the presence of an extensive peridotite mass was known from earlier investigations. This rock proved to be of a varying mineral composition, the ... -
Field relations and geochemical evolution of the Gothian rocks in the Kvamsøy area, southern Western Gneiss Complex, Norway
(NGU Bulletin (437), Journal article, 2000)The igneous rocks of the Kvamsøy area in the southern parts of the Western Gneiss Complex (WGC) of Norway comprise a wide variety of granitic, syenitic. granodioritic and gabbroic compositions and formed in the interval ... -
Geochemical evidence in support of sedimentary precursors to Proterozoic sillimanite-bearing rocks, Vest-Agder, South Norway
(NGU Bulletin (446), Journal article, 2006)Sillimanite-bearing alumina-rich schists and gneisses from three different areas within the Agder region in southern Norway are interpreted as having sedimentary precursors, transformed during deep-seated Sveconorwegian ... -
Geological reconnaissance of the area between Kristiansand and Lillesand.
(NGU (205), Journal article, 1959)Randesund-området, et felt på ca. 400 km\u00B2, ligger mellom Lillesand og Kristiansand, dels i Aust-Agder, dels i Vest-Agder fylke. Innen området er det utført petrografisk-tektoniske undersøkelser for Norges Geologiske ... -
Geology and structural evolution of the Precambrian rocks of the Oslofjord - Øyeren area, Southeast Norway.
(NGU Bulletin (398), Journal article, 1984)The area (1200 km\u00B2) described covers the northern part of a major thrust segment in the eastern subprovince of the Sveonorwegian orogenic belt along the southwestern margin of the Baltic Shield. The oldest rock unit ... -
Grunnfjellet omkring Tangen, østsiden av Mjøsa.
(NGU (211), Journal article, 1960)Petrographic and structural investigations were made in a Precambrian area east of lake Mjøsa, southern Norway. The rocks, mainly granitic and dioritic, are mostly mylonitised and brecciated. Some of the fault zones are ... -
Grunnvann øst for Oslo-feltet. Meddelelse fra Vannboringsarkivet nr. 10.
(NGU (213), Journal article, 1961)A rapid survey of the general geology south, east and northeast of Oslo is given with a view to explain the differences in water supply in various Precambrian rocks. The gneisses usually give much more water than the more ... -
II. Sørfolden-Riksgrænsen
(NGU (79), Journal article, 1917)The present paper is a text to the maps \"Sørfolden\" and \"Riddoalgge\" situated in Nordland between 67o20' and 67o40' N. The geological surveys were made during the summers of 1914, 15 & 16. The annexed map is a reduction ... -
Kullblendeførende breksje ved Hof, Solør.
(NGU (213), Journal article, 1961)The breccia has possibly connection with the Permian faults in Rendalen, farther north, and the coal blend is probably derived from the dark Cambrian shale, once deposited on the Precambrian peneplane. A number of minerals ... -
On the form and mode of emplacement of the Herefoss granite.
(NGU (214A), Journal article, 1963)Det geologiske kart over S.Ø. Aust-Agder er dominert av to nesten sirkelrunde granittmassiver, Herefossgranitten (Birkelandsgranitten) og Grimstadgranitten (Fevikgranitten). Et kart over den geologiske omgivelse av disse ... -
On the gneisses from a part of the north-western gneiss area of Southern Norway.
(NGU (173), Journal article, 1949)The north-western part of Southern Norway is an area mainly of gneisses, formerly regarded as entirely of Archean age. In later years a number of writers have maintained that parts of the gneisses are Caledonian migmatites ... -
Origin of plagioclase-megacrysitic, orthopyroxene amphibolites within a Precambrian banded gneiss suite, Flekkefjord area, Vest-Agder, South Norway.
(NGU Bulletin (438), Journal article, 2001)Within a banded gneiss suite belonging to the high-grade Mesoproterozoic Flekkefjord complex in southern Norway, thin lenses of orthopyroxene amphibolites with medium- to large-size plagioclase megacrysts are located at ... -
Precambrian and Caledonian tectonometamorphic evolution of Northeastern Seiland, Finnmark, North Norway.
(NGU (373), Journal article, 1982)The metamorphic rocks of northeastern Seiland are predominantly Precambrian gneisses and schists. The Fagervik infracrustal complex, composed of tonalitic gneisses, constitutes a basement to the Late Precambrian-Cambrian ...