Blar i Artikler på emneord "DATERING"
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Isotopic composition, deposition ages and environemnts of Central Norwegian Caledonian marbles
(NGU Bulletin (427), Journal article, 1995) -
Kentallenite (olovine-monzonite) in Bindal, Central Norwegian Caldonides.
(NGU Bulletin (413), Journal article, 1988)A rock-type identified as kentallenite is reported from the southwestern partof the Helgeland Nappe Complex, Central Norway. The kentallenite is ahypabyssal rock and belongs to a suite of appinitic mafic dykes and smallstocks ... -
Late Quaternary geological development of the Jutland Bank and the initiation of the Jutland Current, NE North Sea
(NGU Bulletin (430), Journal article, 1996)Using shallow seismic and core data, a reconstruction has been made of the Late Pleistocene-Early Holocene palaeogeography of Jutland Bank, NE North Sea. A division of Late Pleistocene and Holocene deposits into five ... -
Middle and Late Pleistocene stratigraphy, chronology and glacial history in Finnmark, North Norway.
(NGU Bulletin (429), Journal article, 1996)The Pleistocene superficial deposits in Finnmark, North Norway, were investigated in about 250 excavations and drillings during the period 1960-1990. Based on this regional background data six localities on Finnmarksvidda ... -
Origin of shallow gas in Skagerrak and Kattegat - evidence from stable isotopic analyses and radiocarbon dating
(NGU Bulletin (430), Journal article, 1996)In the Danish coastal waters of northern Kattegat - southern Skagerrak, methane occurs both within sediments and as numerous gas seeps. -
Post-Sveconorwegian exhumation and cooling history of the Evje area, southern Setesdal, Central South Norway
(NGU Bulletin (431), Journal article, 1996)Fission track (FT) dating of apatite and sphene from monzonitic dyke rocks in a Middle to Late proterozoic intrusion from the Setesdal region, southern Norway, indicates cooling from intrusion temperatures of the surroundings ... -
Radiocarbon dates from the mountain area northeast of Årdal, southern Norway, evidence for a Preboreal deglaciation.
(NGU Bulletin (418), Journal article, 1990)Radiocarbon dates obtained on macrofossil plant remains (mainly Betula nana-sticks and mosses) and basal gyttja from a kettle hole at the outlet of Berdalsvatn 1017 m a.s.l. northeast of rdal, inner Sogn, yielded ages of ... -
Rb-Sr age of the Blåfjellhatten granite in the Olden Window, Central Norway.
(NGU Bulletin (420), Journal article, 1990)Rb-Sr isotope whole-rock dating of undeformed and unaltered parts of the Blåfjellhatten granite has yielded an isochron age of 1356 +- 29 Ma with I.R.=0.7254 +-0.0027, interpreted as the age of intrusion. This age contrasts ... -
Rb-Sr dating of strain-induced mineral growth in two ductile shear zones in the Western Gneiss Region of Nord-Trøndelag, Central Norway.
(NGU Bulletin (413), Journal article, 1988)In the Bjugn district of the northern part of the Western Gneiss Region,Nord-Trøndelag, a basement gneiss - cover nappe boundary is marked by a thickzone of ductile shearing, in which a layer-parallel mylonitic fabric ... -
Rb-Sr isotope systematics in the magmatic rocks of the Oslo rift.
(NGU Bulletin (418), Journal article, 1990)Fifty-one different units of Oslo Rift magmatic rocks have been investigated by the Rb-Sr isotope method. Isochron ages obtained for all but three of the units vary between 295 Ma and 240 Ma. The ages from the southern ... -
Recent changes in environmental conditions in the southwestern Kattegat, Scandinavia
(NGU Bulletin (430), Journal article, 1996)Short cores (20-30 cm) were taken from two sites in the southwestern Kattegat at similar water depths )<20 m; under the pycnocline but with different exposures and resuspension rates ( gross sedimentation rates: 3419 and ... -
Recent sediment accumulation in the Norwegian Channel, North Sea
(NGU Bulletin (430), Journal article, 1996)In the Norwegian Channel 35 box cores were taken for sedimentological analysis, and 210Po a- and137Cs y-spectroscopy to determine sedimentation rates. Grain sizes were determined and X-ray photographs of the cores were ... -
Recent sedimentation rates across the Norwegian Trough
(NGU Bulletin (430), Journal article, 1996)From the systematic sampling of 20 stations of the Norwegian part of the Skagerrak in 1993, six cores were chosen for determination of recent sedimentation rates by the lead-210 method and verifications by Cs-137 depth ... -
Sea-bed sediments and sediment accumulation rates in the Norwegian part of the Skagerrak
(NGU Bulletin (430), Journal article, 1996)Grain-size analysis show that the sea-bed sediments over large areas in the Norwegian Trench and along its northern slope consist of homogeneous silty clay with a clay content of 50-75% and generally less than 2% sand. ... -
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. ... -
Sub-till sediments at Rokoberget, Southeastern Norway
(NGU Bulletin (424), Journal article, 1993)A dark blue-grey, silty clay below till is described from a locality 230 m a.s.l. in the Rokosjøen depression east of Mjøsa. The sediment is glacially deformed but interpreted to represent a deposit from a period with local ... -
The deglaciation and vegetational history of a former ice-damned lake area at Skåbu, Nord-Fron, Southern Norway.
(NGU (373), Journal article, 1982)Cores obtained from a small peat bog within the area of a former ice-dammed lake show that 1.7 m of silt were deposited during the ice lake phase. The pollen in the silt is dominated by grasses and other NAP. A small ... -
The Iddefjord granite: geology and age
(NGU Bulletin (417), Journal article, 1990)The Iddefjord granite forms part of the Swedish Bohus batholith and ranges in composition from diorite to granite. The granite consists of 13 individual plutons, and the mechanism of intrusion is related to block subsidence ... -
The Late Weichselian - Early Holocene Lindhov clay sequence in the Varberg area, southwestern Sweden
(NGU Bulletin (430), Journal article, 1996)A clay sequence with spacific depositional characteristics has been found, both on land and in the sea, in the area surrounding the town of Varberg and extending north along the coast. The clay sequence, here provisionally ... -
The structure of the Magerøy Nappe, Finnmark, North Norway.
(NGU (363), Journal article, 1981)The Magerøy Nappe was emplaced during the Scandinavian phase of the Caledonian orogeny, of Middle\/Upper Silurian age. Two main episodes of deformation (D1 and D2) with attendant Barrovian-type regional metamorphism are ...