Distribution of Th, U, K in the Plutonic Rocks of the Oslo Region, Norway

Raade, Gunnar

doi:10.1007/978-94-009-9803-2_17

Cited by 7 publications

(16 citation statements)

References 4 publications

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“…Extension was minor, as shown by the weak crustal thickness difference between the graben and the shield ( Figure 1). Raade [1978] showed that the average chemical composition of the graben formations is similar to that of the shield. This event does not represent a significant influx of radioelements as basalts are poor in them.…”

Section: Radioactivity In the Precambrian Shield And The Oslo Grabenmentioning

confidence: 88%

“…The effect is to redistribute heat production without affecting the total. Raade [1978] showed that the average chemical composition of the graben formations is similar to that of the shield. Indeed, the average surface heat production is 2.9 gW/m 3 (Table 1), which is similar to the previous value.…”

Section: Radioactivity In the Precambrian Shield And The Oslo Grabenmentioning

confidence: 88%

“…A rifting event occurred in Permian times which resulted in the formation of many plutons in the Oslo graben [Oftedahl, 1978;Ramberg & Spjeldnaes, 1978]. Excluding Caledonian crust which is allochthonous, a large number of radioactivity determinations are availdole, coming mostly from the Mineralogisk-Geologisk Museum in Oslo [Killeen & Heier, 1975;Raade, 1978]. Granulite facies rocks crop out in three regions: the Egersund and Bamble areas in southern Norway, and the Lofoten-Vesteralen area of northern Norway (figure 1).…”

Section: Tile Precambrian Shield Of Norway and Swedenmentioning

confidence: 99%

“…D value is then some average of the various thicknesses involved. The Oslo graben is probably a good candidate for such an interpretation, because it is made almost exclusively of granitic plutons, which sometimes overlap [Raade, 1978]. As shown by thickness data in Table 4, To determine the average heat production of the shield, two methods are possible.…”

Section: The Linear Heat Flow Relation In Norway and Swedenmentioning

confidence: 99%

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The vertical distribution of radiogenic heat production in the Precambrian crust of Norway and Sweden: Geothermal implications

Pinet

Jaupart

1987

Geophysical Research Letters

103

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The present geology of southern Scandinavia offers the unique opportunity to sample deep and intermediate levels from the same crustal section for both heat flow and heat production. In the central part of southern Norway, amphibolite facies terranes appear to lie on top of the same deeper crustal formations which crop out on their western and eastern margins. An extensive data set on the geochemistry of all types of rocks in the region culled from the literature is used to derive values for radiogenic heat production for each kind of crustal facies. Using constraints from heat flow data in the same area allows a reliable model of the distribution of crustal heat production. The average heat production of granulite facies terranes is 0.4 µW/m³, similar to values in other parts of the world. For amphibolite facies rocks, the value is 1.6 µW/m³. The present shield also includes heat producing element enriched granites formed in later events and the average heat production of presently exposed crust is 2.7 µ/m³. Using heat flow and radioactivity data from ten stations, the reduced heat flow in the area is 22 ± 2 mW/m². This corresponds to the heat flow at the top of 28 km of deep crustal facies, implying that the mantle heat flow is probably as low as 10 mW/m². Over the whole crustal thickness, the average amount of radiogenic heat is 31 mW/m².

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Section: Radioactivity In the Precambrian Shield And The Oslo Grabenmentioning

confidence: 88%

Section: Radioactivity In the Precambrian Shield And The Oslo Grabenmentioning

confidence: 88%

Section: Tile Precambrian Shield Of Norway and Swedenmentioning

confidence: 99%

Section: The Linear Heat Flow Relation In Norway and Swedenmentioning

confidence: 99%

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The vertical distribution of radiogenic heat production in the Precambrian crust of Norway and Sweden: Geothermal implications

Pinet

Jaupart

1987

Geophysical Research Letters

103

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“…LUSTENHOUWER steen, 1988;Hansteen and Burke, 1989). Several rare minerals have been described from the miarolitic cavities and in the rock proper (Dietrich et al, 1965;Raade, 1972;Neumann et al, 1989).…”

Section: Geology and Petrographymentioning

confidence: 99%

Silicate melt inclusions from a mildly peralkaline granite in the Oslo paleorift, Norway

Hansteen¹,

Lustenhouwer

1990

Mineral. mag.

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The mildy peralkaline Eikeren-Skrim granite belongs to the Permian magmatic province of the Oslo rift, south-east Norway. Euhedral quartz crystals from the abundant miarolitic cavities contain primary inclusions of partly crytallized silicate melts and coexisting primary, aqueous fluid inclusions. Microthermometric measurements give maximum estimates for the granite solidus of 685-705 ~ Quenched silicate melt inclusions are not peralkaline, have normative Or/Ab weight ratios of 1.15-1.44 (compared to 0.49--0.80 in whole-rock samples) and F and C1 contents of 0.1 and 0.21-0.65 wt. %, respectively. Coexisting magmatic fluid inclusions are highly enriched in Na, C1, S and to some extent K. These chemical characteristics are the results of late-magmatic melt-mineral-fluid interaction in the miarolitic cavities.

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Geochemistry of some eudialyte-eucolite specimens and a co-existing catapleiite from Langesund, Norway

Bollingberg

Ure²,

Sørensen

et al. 1983

TMPM Tschermaks Petr. Mitt.

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Distribution of Th, U, K in the Plutonic Rocks of the Oslo Region, Norway

Cited by 7 publications

References 4 publications

The vertical distribution of radiogenic heat production in the Precambrian crust of Norway and Sweden: Geothermal implications

The vertical distribution of radiogenic heat production in the Precambrian crust of Norway and Sweden: Geothermal implications

Silicate melt inclusions from a mildly peralkaline granite in the Oslo paleorift, Norway

Geochemistry of some eudialyte-eucolite specimens and a co-existing catapleiite from Langesund, Norway

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