Heat flow of northern Norway, new data and geodynamic implications.
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| Title: | Heat flow of northern Norway, new data and geodynamic implications. |
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| Authors: | Pascal, Christophe1 (AUTHOR) christophe.pascal@rub.de, Balling, Niels2 (AUTHOR) |
| Source: | Tectonophysics. Nov2023, Vol. 867, pN.PAG-N.PAG. 1p. |
| Subjects: | Geodynamics, Core materials, Seismic tomography, Boreholes, Seismology, Lithosphere |
| Geographic Terms: | Norway |
| Abstract: | The present contribution introduces new heat flow data from northern Norway, a region of the Baltic Shied and Scandinavian Caledonides that has been poorly covered until now. We computed heat flow values based on data gathered in ten boreholes reaching total depths ranging between ∼390 m and 960 m below ground level. Abundant core material for five of the studied boreholes allowed for precise determination of thermal conductivity profiles. The new determinations represent significant improvement with respect to the few pre-existing heat flow values that were based on shallow drillholes and lake measurements. The obtained heat flow values range between ∼40 and 70 mW/m2, after corrections, and suggest significant heat flow decrease (i.e. ∼10–20 mW/m2) from chiefly Proterozoic terrains to the Archean nucleus in NE Norway. The results suggest also sharp decrease in heat flow from the NE Atlantic to the Lofoten-Vesterålen margin but rather smooth gradients from the Barents Shelf to the continent. The former may be associated with abrupt deepening of the base of the lithosphere below the Lofoten-Vesterålen margin, as already suggested by previous seismic tomography studies and consistent with drastic strain focusing and the formation of a narrow margin. In contrast, gradual deepening of the base lithosphere towards the continent appears to be in agreement with the observed diffuse deformation that took place in the comparatively wide Western Barents Shelf. • Previous heat flow data from northern Norway were scarce and poor in quality. • We computed new heat flow values based on data gathered in ten boreholes reaching total depths between ∼390 m and 960 m. • Our results suggest heat flow values ranging between ∼40 and 70 mW/m2 after corrections. [ABSTRACT FROM AUTHOR] |
| Copyright of Tectonophysics is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 173473483 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Heat flow of northern Norway, new data and geodynamic implications. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Pascal%2C+Christophe%22">Pascal, Christophe</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> christophe.pascal@rub.de</i><br /><searchLink fieldCode="AR" term="%22Balling%2C+Niels%22">Balling, Niels</searchLink><relatesTo>2</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Tectonophysics%22">Tectonophysics</searchLink>. Nov2023, Vol. 867, pN.PAG-N.PAG. 1p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Geodynamics%22">Geodynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Core+materials%22">Core materials</searchLink><br /><searchLink fieldCode="DE" term="%22Seismic+tomography%22">Seismic tomography</searchLink><br /><searchLink fieldCode="DE" term="%22Boreholes%22">Boreholes</searchLink><br /><searchLink fieldCode="DE" term="%22Seismology%22">Seismology</searchLink><br /><searchLink fieldCode="DE" term="%22Lithosphere%22">Lithosphere</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Norway%22">Norway</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The present contribution introduces new heat flow data from northern Norway, a region of the Baltic Shied and Scandinavian Caledonides that has been poorly covered until now. We computed heat flow values based on data gathered in ten boreholes reaching total depths ranging between ∼390 m and 960 m below ground level. Abundant core material for five of the studied boreholes allowed for precise determination of thermal conductivity profiles. The new determinations represent significant improvement with respect to the few pre-existing heat flow values that were based on shallow drillholes and lake measurements. The obtained heat flow values range between ∼40 and 70 mW/m2, after corrections, and suggest significant heat flow decrease (i.e. ∼10–20 mW/m2) from chiefly Proterozoic terrains to the Archean nucleus in NE Norway. The results suggest also sharp decrease in heat flow from the NE Atlantic to the Lofoten-Vesterålen margin but rather smooth gradients from the Barents Shelf to the continent. The former may be associated with abrupt deepening of the base of the lithosphere below the Lofoten-Vesterålen margin, as already suggested by previous seismic tomography studies and consistent with drastic strain focusing and the formation of a narrow margin. In contrast, gradual deepening of the base lithosphere towards the continent appears to be in agreement with the observed diffuse deformation that took place in the comparatively wide Western Barents Shelf. • Previous heat flow data from northern Norway were scarce and poor in quality. • We computed new heat flow values based on data gathered in ten boreholes reaching total depths between ∼390 m and 960 m. • Our results suggest heat flow values ranging between ∼40 and 70 mW/m2 after corrections. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Tectonophysics is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.tecto.2023.230067 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 1 StartPage: N.PAG Subjects: – SubjectFull: Geodynamics Type: general – SubjectFull: Core materials Type: general – SubjectFull: Seismic tomography Type: general – SubjectFull: Boreholes Type: general – SubjectFull: Seismology Type: general – SubjectFull: Lithosphere Type: general – SubjectFull: Norway Type: general Titles: – TitleFull: Heat flow of northern Norway, new data and geodynamic implications. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Pascal, Christophe – PersonEntity: Name: NameFull: Balling, Niels IsPartOfRelationships: – BibEntity: Dates: – D: 20 M: 11 Text: Nov2023 Type: published Y: 2023 Identifiers: – Type: issn-print Value: 00401951 Numbering: – Type: volume Value: 867 Titles: – TitleFull: Tectonophysics Type: main |
| ResultId | 1 |
