Feedbacks of sedimentation on crustal heat flow: New insights from the Vøring Basin, Norwegian Sea
Basement heat flow is one of the key unknowns in sedimentary basin analysis. Its quantification is challenging not in the least due to the various feedback mechanisms between the basin and lithosphere processes. This study explores two main feedbacks, sediment blanketing and thinning of sediments du...
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ftoceanrep:oai:oceanrep.geomar.de:10541 2023-05-15T17:47:01+02:00 Feedbacks of sedimentation on crustal heat flow: New insights from the Vøring Basin, Norwegian Sea Theissen, Sonja Rüpke, Lars 2010 text https://oceanrep.geomar.de/id/eprint/10541/ https://oceanrep.geomar.de/id/eprint/10541/1/Basin_Research.pdf https://doi.org/10.1111/j.1365-2117.2009.00437.x en eng Wiley https://oceanrep.geomar.de/id/eprint/10541/1/Basin_Research.pdf Theissen, S. and Rüpke, L. (2010) Feedbacks of sedimentation on crustal heat flow: New insights from the Vøring Basin, Norwegian Sea. Basin Research, 22 (6). pp. 976-990. DOI 10.1111/j.1365-2117.2009.00437.x <https://doi.org/10.1111/j.1365-2117.2009.00437.x>. doi:10.1111/j.1365-2117.2009.00437.x info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2010 ftoceanrep https://doi.org/10.1111/j.1365-2117.2009.00437.x 2023-04-07T14:58:40Z Basement heat flow is one of the key unknowns in sedimentary basin analysis. Its quantification is challenging not in the least due to the various feedback mechanisms between the basin and lithosphere processes. This study explores two main feedbacks, sediment blanketing and thinning of sediments during lithospheric stretching, in a series of synthetic models and a reconstruction case study from the Norwegian Sea. Three types of basin models are used: (1) a newly developed one-dimensional (1D) forward model, (2) a decompaction/backstripping approach and (3) the commercial basin modelling software TECMOD2D for automated forward basin reconstructions. The blanketing effect of sedimentation is reviewed and systematically studied in a suite of 1D model runs. We find that even for moderate sedimentation rates (0.5 mm year−1), basement heat flow is depressed by ∼25% with respect to the case without sedimentation; for high sedimentation rates (1.5 mm year−1), basement heat flow is depressed by ∼50%. We have further compared different methods for computing sedimentation rates from the presently observed stratigraphy. Here, we find that decompaction/backstripping-based methods may systematically underestimate sedimentation rates and total subsidence. The reason for this is that sediments are thinned during lithosphere extension in forward basin models while there are not in backstripping/decompaction approaches. The importance of sediment blanketing and differences in modelling approaches is illustrated in a reconstruction case study from the Norwegian Sea. The thermal and structural evolution of a transect across the Vøring Basin has been reconstructed using the backstripping/decompaction approach and TECMOD2D. Computed total subsidence curves differ by up to ∼3 km and differences in computed basement heat flows reach up to 50%. These findings show that strong feedbacks exist between basin and lithosphere processes and that resolving them require integrated lithosphere-scale basin models. Article in Journal/Newspaper Norwegian Sea OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Norwegian Sea Basin Research |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
Basement heat flow is one of the key unknowns in sedimentary basin analysis. Its quantification is challenging not in the least due to the various feedback mechanisms between the basin and lithosphere processes. This study explores two main feedbacks, sediment blanketing and thinning of sediments during lithospheric stretching, in a series of synthetic models and a reconstruction case study from the Norwegian Sea. Three types of basin models are used: (1) a newly developed one-dimensional (1D) forward model, (2) a decompaction/backstripping approach and (3) the commercial basin modelling software TECMOD2D for automated forward basin reconstructions. The blanketing effect of sedimentation is reviewed and systematically studied in a suite of 1D model runs. We find that even for moderate sedimentation rates (0.5 mm year−1), basement heat flow is depressed by ∼25% with respect to the case without sedimentation; for high sedimentation rates (1.5 mm year−1), basement heat flow is depressed by ∼50%. We have further compared different methods for computing sedimentation rates from the presently observed stratigraphy. Here, we find that decompaction/backstripping-based methods may systematically underestimate sedimentation rates and total subsidence. The reason for this is that sediments are thinned during lithosphere extension in forward basin models while there are not in backstripping/decompaction approaches. The importance of sediment blanketing and differences in modelling approaches is illustrated in a reconstruction case study from the Norwegian Sea. The thermal and structural evolution of a transect across the Vøring Basin has been reconstructed using the backstripping/decompaction approach and TECMOD2D. Computed total subsidence curves differ by up to ∼3 km and differences in computed basement heat flows reach up to 50%. These findings show that strong feedbacks exist between basin and lithosphere processes and that resolving them require integrated lithosphere-scale basin models. |
format |
Article in Journal/Newspaper |
author |
Theissen, Sonja Rüpke, Lars |
spellingShingle |
Theissen, Sonja Rüpke, Lars Feedbacks of sedimentation on crustal heat flow: New insights from the Vøring Basin, Norwegian Sea |
author_facet |
Theissen, Sonja Rüpke, Lars |
author_sort |
Theissen, Sonja |
title |
Feedbacks of sedimentation on crustal heat flow: New insights from the Vøring Basin, Norwegian Sea |
title_short |
Feedbacks of sedimentation on crustal heat flow: New insights from the Vøring Basin, Norwegian Sea |
title_full |
Feedbacks of sedimentation on crustal heat flow: New insights from the Vøring Basin, Norwegian Sea |
title_fullStr |
Feedbacks of sedimentation on crustal heat flow: New insights from the Vøring Basin, Norwegian Sea |
title_full_unstemmed |
Feedbacks of sedimentation on crustal heat flow: New insights from the Vøring Basin, Norwegian Sea |
title_sort |
feedbacks of sedimentation on crustal heat flow: new insights from the vøring basin, norwegian sea |
publisher |
Wiley |
publishDate |
2010 |
url |
https://oceanrep.geomar.de/id/eprint/10541/ https://oceanrep.geomar.de/id/eprint/10541/1/Basin_Research.pdf https://doi.org/10.1111/j.1365-2117.2009.00437.x |
geographic |
Norwegian Sea |
geographic_facet |
Norwegian Sea |
genre |
Norwegian Sea |
genre_facet |
Norwegian Sea |
op_relation |
https://oceanrep.geomar.de/id/eprint/10541/1/Basin_Research.pdf Theissen, S. and Rüpke, L. (2010) Feedbacks of sedimentation on crustal heat flow: New insights from the Vøring Basin, Norwegian Sea. Basin Research, 22 (6). pp. 976-990. DOI 10.1111/j.1365-2117.2009.00437.x <https://doi.org/10.1111/j.1365-2117.2009.00437.x>. doi:10.1111/j.1365-2117.2009.00437.x |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1111/j.1365-2117.2009.00437.x |
container_title |
Basin Research |
_version_ |
1766151165874012160 |