Geothermal investigations in the Bohus granite area in southwestern Sweden

Landström, Ove; Larson, Sven Åke; Lind, Gustaf; Malmqvist, David

doi:10.1016/0040-1951(80)90266-8

Cited by 31 publications

(7 citation statements)

References 17 publications

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“…Another difficulty is that the D value of 7 km cannot be compared to thickness estimates for the same formations (Table 4). This had been pointed out by Landstr0m et al [1980]. A similar discrepancy has been noticed in other provinces [Jaupart, 1983].…”

Section: The Linear Heat Flow Relation In Norway and Swedensupporting

confidence: 75%

“…from several closely-spaced stations[Landstr0m et al, 1980;Malmqvist et al, 1983]. Therefore, they represent high-quality data with minimum errors due to site eff•ts (topography, shallow water circulation, etc...).None of them have been corrected for climatic perturbations because the original study of Swanberg et al [1974] indicated that they were negligible.…”

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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: The Linear Heat Flow Relation In Norway and Swedensupporting

confidence: 75%

mentioning

confidence: 99%

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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“…In the Sveconorwegian Idefjorden granite-pegmatite area which extends past Norwegian border, four Swedish heat flow sites are not located on any polygon with heat production data available. Unfortunately, these also include the borehole drilled to 4-km-thick granite body in Bohus, of particular importance due to its very high heat flow of 76 mW m -2 (Landström et al 1980). Heat production values obtained from Norwegian Idefjorden units (Slagstad 2008), exceed the Sveconorwegian average obtained from our Swedish data analysis (1.74 ± 1.37 μW m -3 ).…”

Section: R E S U Lt Scontrasting

confidence: 59%

Radiogenic heat production analysis of Fennoscandian Shield and adjacent areas in Sweden

Veikkolainen

Kukkonen

Näslund

2019

Geophysical Journal International

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In northern Europe, radiogenic heat production of surface rocks has been extensively studied in Finland and Norway alike. This paper presents a heat production analysis of Sweden, based on a rock outcrop data compilation obtained from the Geological Survey of Sweden (SGU). The study area comprises Precambrian Shield, Caledonian and platform cover areas. Altogether 39 933 samples with uranium, thorium and potassium concentration (C U , C Th and C K) and density (ρ) data were available. Heat production (HP) was calculated using raw point data, binning on a regular grid, and averaging by bedrock units in the geological map. Methods based on raw point data and grid-based binning resulted in HP values of 2.5 ± 4.1 and 2.5 ± 5.6 μW m-3 , respectively, while averaging by lithology produced a lower value of 2.4 ± 1.7 μW m-3. Limiting the lithology-based averaging to Precambrian bedrockareas resulted in heat production of 2.4 ± 1.6 μW m-3. Due to the small geographic extent of area covered by sediments, this is similar to the Precambrian-only value. Regardless of the calculation method, heat production in Sweden is considerably higher than the corresponding value for Finland. The Swedish platform cover had apparently the lowestheat production (1.0 ± 1.8 μW m-3) of all units but the presence of Precambrian rocks below the sediments means that this value strongly misleads if used to represent the entire upper crust. Svecokarelian (Svecofennian) and Sveconorwegian rocks, which comprised 94.0 per cent of all individual observations, had heat production values of 2.6 ± 1.8 and 1.7 ± 1.4 μW m-3 , respectively. Although the Swedish data still have large spatial gaps when compared to Finnish data, most bedrock units in Sweden are covered. It is obvious that the higher heat flow of Sweden compared to that of Finland is caused by near-surface (i.e. upper crustal) heat production, and crustal differentiation in Sweden is also larger.

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“…As pointed out also by Samuelsson & Middleton (1998), estimates about the parameters such as flexural rigidity of the lithosphere, the thermal conductivity and the basal heat flow will influence the calculations making the results imprecise. Concerning the crystalline basement in Sweden, Landström et al (1980) and Malmqvist et al (1985) discussed thermal conductivity and heat flow in detail.…”

Section: The Existence Of a Late Palaeozoic Foreland Basin To The Scamentioning

confidence: 98%

The Caledonian foreland basin in Scandinavia: Constrained by the thermal maturation of the Alum Shale. A discussion

Larson

Tullborg

Cederbom

et al. 1999

GFF

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Geothermal investigations in the Bohus granite area in southwestern Sweden

Cited by 31 publications

References 17 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

Radiogenic heat production analysis of Fennoscandian Shield and adjacent areas in Sweden

The Caledonian foreland basin in Scandinavia: Constrained by the thermal maturation of the Alum Shale. A discussion

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