Spatiotemporal Variations in Surface Heat Loss Imply a Heterogeneous Mantle Cooling History
Abstract Earth's heat budget is strongly influenced by spatial and temporal variations in surface heat flow caused by plate tectonic cycles. Here, we use a novel set of paleo‐seafloor age grids extending back to the mid‐Paleozoic to infer spatiotemporal variations in surface heat loss. The time...
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| Format: | Article |
| Language: | English |
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Wiley
2021-03-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2020GL092119 |
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| author | Krister S. Karlsen Clinton P. Conrad Mathew Domeier Reidar G. Trønnes |
| author_facet | Krister S. Karlsen Clinton P. Conrad Mathew Domeier Reidar G. Trønnes |
| author_sort | Krister S. Karlsen |
| collection | DOAJ |
| description | Abstract Earth's heat budget is strongly influenced by spatial and temporal variations in surface heat flow caused by plate tectonic cycles. Here, we use a novel set of paleo‐seafloor age grids extending back to the mid‐Paleozoic to infer spatiotemporal variations in surface heat loss. The time‐averaged oceanic heat flow is 36.6 TW, or ∼25% greater than at present‐day. Our thermal budget for the mantle indicates that 149 K/Gyr of cooling occurred over this period, consistent with geochemical estimates of mantle cooling for the past 1 Gyr. Our analysis also suggests sustained rapid cooling of the Pacific mantle hemisphere, which may have cooled ∼50 K more than its African counterpart since 400 Ma. The extra heat released from the Pacific mantle may have been trapped there by the earlier long‐lived supercontinent Rodinia (∼1.1–0.7 Ga), and the Pacific mantle may still be hotter than the African mantle today. |
| format | Article |
| id | doaj-art-9146aa0fe6824efea32c6c2448a4c097 |
| institution | OA Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2021-03-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-9146aa0fe6824efea32c6c2448a4c0972025-08-20T01:48:15ZengWileyGeophysical Research Letters0094-82761944-80072021-03-01486n/an/a10.1029/2020GL092119Spatiotemporal Variations in Surface Heat Loss Imply a Heterogeneous Mantle Cooling HistoryKrister S. Karlsen0Clinton P. Conrad1Mathew Domeier2Reidar G. Trønnes3Centre for Earth Evolution and Dynamics University of Oslo Oslo NorwayCentre for Earth Evolution and Dynamics University of Oslo Oslo NorwayCentre for Earth Evolution and Dynamics University of Oslo Oslo NorwayCentre for Earth Evolution and Dynamics University of Oslo Oslo NorwayAbstract Earth's heat budget is strongly influenced by spatial and temporal variations in surface heat flow caused by plate tectonic cycles. Here, we use a novel set of paleo‐seafloor age grids extending back to the mid‐Paleozoic to infer spatiotemporal variations in surface heat loss. The time‐averaged oceanic heat flow is 36.6 TW, or ∼25% greater than at present‐day. Our thermal budget for the mantle indicates that 149 K/Gyr of cooling occurred over this period, consistent with geochemical estimates of mantle cooling for the past 1 Gyr. Our analysis also suggests sustained rapid cooling of the Pacific mantle hemisphere, which may have cooled ∼50 K more than its African counterpart since 400 Ma. The extra heat released from the Pacific mantle may have been trapped there by the earlier long‐lived supercontinent Rodinia (∼1.1–0.7 Ga), and the Pacific mantle may still be hotter than the African mantle today.https://doi.org/10.1029/2020GL092119mantle thermal evolutionsurface heat flow |
| spellingShingle | Krister S. Karlsen Clinton P. Conrad Mathew Domeier Reidar G. Trønnes Spatiotemporal Variations in Surface Heat Loss Imply a Heterogeneous Mantle Cooling History Geophysical Research Letters mantle thermal evolution surface heat flow |
| title | Spatiotemporal Variations in Surface Heat Loss Imply a Heterogeneous Mantle Cooling History |
| title_full | Spatiotemporal Variations in Surface Heat Loss Imply a Heterogeneous Mantle Cooling History |
| title_fullStr | Spatiotemporal Variations in Surface Heat Loss Imply a Heterogeneous Mantle Cooling History |
| title_full_unstemmed | Spatiotemporal Variations in Surface Heat Loss Imply a Heterogeneous Mantle Cooling History |
| title_short | Spatiotemporal Variations in Surface Heat Loss Imply a Heterogeneous Mantle Cooling History |
| title_sort | spatiotemporal variations in surface heat loss imply a heterogeneous mantle cooling history |
| topic | mantle thermal evolution surface heat flow |
| url | https://doi.org/10.1029/2020GL092119 |
| work_keys_str_mv | AT kristerskarlsen spatiotemporalvariationsinsurfaceheatlossimplyaheterogeneousmantlecoolinghistory AT clintonpconrad spatiotemporalvariationsinsurfaceheatlossimplyaheterogeneousmantlecoolinghistory AT mathewdomeier spatiotemporalvariationsinsurfaceheatlossimplyaheterogeneousmantlecoolinghistory AT reidargtrønnes spatiotemporalvariationsinsurfaceheatlossimplyaheterogeneousmantlecoolinghistory |