New heat flow data from three boreholes near Bergen, Stavanger and Moss, southern Norway

Maystrenko, Yuriy; Slagstad, Trond; Elvebakk, Harald; Olesen, Odleiv; Ganerød, Guri V.; Rønning, Jan Steinar

doi:10.1016/j.geothermics.2015.03.010

Cited by 13 publications

(9 citation statements)

References 19 publications

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“…13A). The increased radiogenic heat production of the modelled granitic rocks can be partially responsible for the observed increased heat-flow density, similarly to the adjacent areas of the mainland where granites or granitic gneisses with increased contents of the radiogenic elements have been recognised (Slagstad et al, 2009;Maystrenko et al, 2015b;Pascal & Rudlang, 2016). A possible thermal influence on the low rock densities beneath the Horda Platform is indirectly supported by velocity and density measurements of rock samples under simultaneously increasing pressure and temperature by Korchin (2015) who has shown that a zone with slightly decreased velocity/density can be present under upper-crustal conditions.…”

Section: Discussionmentioning

confidence: 86%

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Deep structure of the northern North Sea and southwestern Norway based on 3D density and magnetic modelling

Maystrenko¹,

Olesen²,

Ebbing³

et al. 2017

NJG

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The deep structure of the northern North Sea and the adjacent Norwegian mainland has been analysed by integrating all available structural data in combination with 3D density and magnetic modelling into a lithosphere-scale 3D structural model. The modelled configurations of the sedimentary cover and crystalline crust are consistent with the long-wavelength components of the observed gravity and magnetic fields over the study area. The first-order configurations of the top of the crystalline basement and the Moho topography have been obtained. According to the 3D density modelling, the low-density upper-crustal block beneath the Horda Platform has been shown to indicate a possible presence of metasedimentary and/or fractured granitic rocks. Possible remnants of island arc chains within the central part of the North Sea between the Laurentian and Baltican crustal domains are supported by the modelling. Moreover, based on the results of the 3D magnetic modelling, the 3D density/structural model has been differentiated into smaller crustal blocks with different magnetic properties, implying that these magnetically derived crustal blocks most likely differ lithologically from the rest of the initial density-based larger layers. Within the mainland, most of the crustal blocks with increased magnetic susceptibility are related to granitic and/or granodioritic rocks which are well mapped at the surface according to geological data. A prominent middle-upper crustal magmatic intrusion has been modelled within the northern part of the NorwegianDanish Basin. The local magnetic pattern supports a possible Permian age for this intrusion, whereas the regional magnetic pattern and known geology from the mainland indicate a Sveconorwegian origin as a more viable alternative. At the mantle level, a low-density lithospheric mantle has been modelled beneath NW Norway and adjacent offshore areas, reflecting the likely presence of an upper-mantle low-velocity zone there.

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Section: Discussionmentioning

confidence: 86%

“…13D). This block can be at least partially related to a known granitic/ granodioritic body, the Løvstakken granite, near Bergen, which has a relatively high radiogenic heat production (Maystrenko et al, 2015b;Pascal & Rudlang, 2016).…”

Section: Figure 12 Upper Crystalline Crust (A) Thickness Of the Midmentioning

confidence: 99%

Deep structure of the northern North Sea and southwestern Norway based on 3D density and magnetic modelling

Maystrenko¹,

Olesen²,

Ebbing³

et al. 2017

NJG

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“…These positive anomalies reflect the thermal effect of heat advection by solid rocks due to vertical movements of these rocks during uplift and erosion. Moreover, a significant decrease of the Earth's surface temperature during the Weichselian glaciation still affects the subsurface temperatures within the uppermost crystalline crust of the study areas (Majorowicz & Wybraniec, 2011; Maystrenko, Slagstad, et al, 2015; Slagstad et al, 2009). Therefore, the uppermost crust still warms up under new climatic conditions and the deep crust cools down due to erosion in order to reach thermal equilibrium beneath the study areas.…”

Section: Discussionmentioning

confidence: 99%

Atmospheric Precipitation and Anomalous Upper Mantle in Relation to Intraplate Seismicity in Norway

et al. 2020

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Two enigmatic regions of high intraplate seismicity in Norway (Western Norway and the Nordland area) show a temporal correlation between the number of earthquakes within the upper crystalline crust and intensity of rain and snowmelt at the Earth's surface. This correlation is obvious in the Nordland area where detailed and reliable data on seismicity are available, whereas the correlation is weaker in Western Norway where detailed data on seismicity are missing. Moreover, these discrete zones of high seismic activity coincide spatially with prominent, low-velocity, and, most likely, thermally anomalous zones in the upper mantle. We propose that in addition to other causes, the high seismicity may be controlled by the anomalous upper mantle, along with topographically induced gravitational potential energy and crustal density variations. Precipitation-induced, seasonal increases in pore-fluid pressure within the fractured crystalline bedrock and changes in water loads may modulate the tectonically controlled seismicity.

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“…4). In the Norwegian model, Scheck-Wenderoth and Maystrenko (2008) considered an average crustal radiogenic heat production of 0.8 µW m −3 , which is much lower than the corresponding value (1.45 µW m −3 ) in the SW African thermal model (Table 1) measurements in the Scandinavian Caledonides that imply an average geothermal gradient of ∼ 17-20 • C km −1 (e.g., Maystrenko et al, 2015;Lorenz et al, 2015;Pascal, 2015). Another impressive characteristic of the thermal field of these two passive margins is in the vicinity of the coastline.…”

Section: The Onshore Domainmentioning

confidence: 90%

Variability of the geothermal gradient across two differently aged magma-rich continental rifted margins of the Atlantic Ocean: the Southwest African and the Norwegian margins

et al. 2018

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Abstract. The aim of this study is to investigate the shallow thermal field differences for two differently aged passive continental margins by analyzing regional variations in geothermal gradient and exploring the controlling factors for these variations. Hence, we analyzed two previously published 3-D conductive and lithospheric-scale thermal models of the Southwest African and the Norwegian passive margins. These 3-D models differentiate various sedimentary, crustal, and mantle units and integrate different geophysical data such as seismic observations and the gravity field. We extracted the temperature–depth distributions in 1 km intervals down to 6 km below the upper thermal boundary condition. The geothermal gradient was then calculated for these intervals between the upper thermal boundary condition and the respective depth levels (1, 2, 3, 4, 5, and 6 km below the upper thermal boundary condition). According to our results, the geothermal gradient decreases with increasing depth and shows varying lateral trends and values for these two different margins. We compare the 3-D geological structural models and the geothermal gradient variations for both thermal models and show how radiogenic heat production, sediment insulating effect, and thermal lithosphere–asthenosphere boundary (LAB) depth influence the shallow thermal field pattern. The results indicate an ongoing process of oceanic mantle cooling at the young Norwegian margin compared with the old SW African passive margin that seems to be thermally equilibrated in the present day.

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New heat flow data from three boreholes near Bergen, Stavanger and Moss, southern Norway

Cited by 13 publications

References 19 publications

Deep structure of the northern North Sea and southwestern Norway based on 3D density and magnetic modelling

Deep structure of the northern North Sea and southwestern Norway based on 3D density and magnetic modelling

Atmospheric Precipitation and Anomalous Upper Mantle in Relation to Intraplate Seismicity in Norway

Variability of the geothermal gradient across two differently aged magma-rich continental rifted margins of the Atlantic Ocean: the Southwest African and the Norwegian margins

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