Are the Norwegian mountains compensated by a mantle thermal anomaly at depth?
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| Title: | Are the Norwegian mountains compensated by a mantle thermal anomaly at depth? |
|---|---|
| Authors: | Pascal, Christophe Christophe.pascal@ngu.no, Olesen, Odleiv1 |
| Source: | Tectonophysics. Sep2009, Vol. 475 Issue 1, p160-168. 9p. |
| Subjects: | Thermal analysis, Plate tectonics, Mantle plumes, Temperature effect, Earth's mantle, Earth (Planet) |
| Geographic Terms: | Kölen Mountains (Sweden & Norway), Sweden, Norway |
| Abstract: | Abstract: The Norwegian mountains or Scandes represent a long mountain range stretching from southern Norway to the Arctic and is characterised by a rugged topography and peaks up to 2.5 km high. The origin of this mountain chain far away from any plate boundary remains a matter of passionate debates inside the geoscientific community. Hot mantle “fingers” originating from the Iceland Plume, impacting the base of the Scandinavian lithosphere and creating asthenospheric diapirs is one of the most accepted hypotheses for explaining Cenozoic uplift in Norway. In order to test this hypothesis we conducted integrated gravity and thermal modelling. We used the dense NGU gravity grid (i.e. one measurement every ~3 km) and modelled the depth extent and the mass deficit associated to the compensating loads located below the southern Scandes. Assuming that the density deficit below the Scandes is purely thermal in origin, thermal modelling allowed for testing the magnitude of the potentially associated temperature anomaly and its impact on surface heat flow. Recently acquired heat flow data were used in order to constrain the results from the thermal modelling. The results of our integrated geophysical modelling rule out the possibility that the present-day topography of the southern Scandes is compensated by a deep-seated asthenospheric diapir. However, our modelling does not exclude that thermal processes in the deep mantle could have initiated or assisted recent uplift of the southern Scandes. [Copyright &y& Elsevier] |
| 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: 44259591 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Are the Norwegian mountains compensated by a mantle thermal anomaly at depth? – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Pascal%2C+Christophe%22">Pascal, Christophe</searchLink><i> Christophe.pascal@ngu.no</i><br /><searchLink fieldCode="AR" term="%22Olesen%2C+Odleiv%22">Olesen, Odleiv</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Tectonophysics%22">Tectonophysics</searchLink>. Sep2009, Vol. 475 Issue 1, p160-168. 9p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Thermal+analysis%22">Thermal analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Plate+tectonics%22">Plate tectonics</searchLink><br /><searchLink fieldCode="DE" term="%22Mantle+plumes%22">Mantle plumes</searchLink><br /><searchLink fieldCode="DE" term="%22Temperature+effect%22">Temperature effect</searchLink><br /><searchLink fieldCode="DE" term="%22Earth's+mantle%22">Earth's mantle</searchLink><br /><searchLink fieldCode="DE" term="%22Earth+%28Planet%29%22">Earth (Planet)</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Kölen+Mountains+%28Sweden+%26+Norway%29%22">Kölen Mountains (Sweden & Norway)</searchLink><br /><searchLink fieldCode="DE" term="%22Sweden%22">Sweden</searchLink><br /><searchLink fieldCode="DE" term="%22Norway%22">Norway</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Abstract: The Norwegian mountains or Scandes represent a long mountain range stretching from southern Norway to the Arctic and is characterised by a rugged topography and peaks up to 2.5 km high. The origin of this mountain chain far away from any plate boundary remains a matter of passionate debates inside the geoscientific community. Hot mantle “fingers” originating from the Iceland Plume, impacting the base of the Scandinavian lithosphere and creating asthenospheric diapirs is one of the most accepted hypotheses for explaining Cenozoic uplift in Norway. In order to test this hypothesis we conducted integrated gravity and thermal modelling. We used the dense NGU gravity grid (i.e. one measurement every ~3 km) and modelled the depth extent and the mass deficit associated to the compensating loads located below the southern Scandes. Assuming that the density deficit below the Scandes is purely thermal in origin, thermal modelling allowed for testing the magnitude of the potentially associated temperature anomaly and its impact on surface heat flow. Recently acquired heat flow data were used in order to constrain the results from the thermal modelling. The results of our integrated geophysical modelling rule out the possibility that the present-day topography of the southern Scandes is compensated by a deep-seated asthenospheric diapir. However, our modelling does not exclude that thermal processes in the deep mantle could have initiated or assisted recent uplift of the southern Scandes. [Copyright &y& Elsevier] – 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.2009.01.015 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 9 StartPage: 160 Subjects: – SubjectFull: Thermal analysis Type: general – SubjectFull: Plate tectonics Type: general – SubjectFull: Mantle plumes Type: general – SubjectFull: Temperature effect Type: general – SubjectFull: Earth's mantle Type: general – SubjectFull: Earth (Planet) Type: general – SubjectFull: Kölen Mountains (Sweden & Norway) Type: general – SubjectFull: Sweden Type: general – SubjectFull: Norway Type: general Titles: – TitleFull: Are the Norwegian mountains compensated by a mantle thermal anomaly at depth? Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Pascal, Christophe – PersonEntity: Name: NameFull: Olesen, Odleiv IsPartOfRelationships: – BibEntity: Dates: – D: 21 M: 09 Text: Sep2009 Type: published Y: 2009 Identifiers: – Type: issn-print Value: 00401951 Numbering: – Type: volume Value: 475 – Type: issue Value: 1 Titles: – TitleFull: Tectonophysics Type: main |
| ResultId | 1 |
