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- Publisher Website: 10.1029/2005GC000967
- Scopus: eid_2-s2.0-33745862515
- WOS: WOS:000231379800001
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Article: Deep mantle heat flow and thermal evolution of the Earth's core in thermochemical multiphase models of mantle convection
Title | Deep mantle heat flow and thermal evolution of the Earth's core in thermochemical multiphase models of mantle convection |
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Authors | |
Keywords | Multicomponent phase changes Thermal evolution Radioactive heating Core-mantle boundary |
Issue Date | 2005 |
Citation | Geochemistry, Geophysics, Geosystems, 2005, v. 6, n. 8 How to Cite? |
Abstract | A coupled model of thermochemical multiphase mantle convection and parameterized heat balance in the Earth's core is used to investigate the need for radioactive potassium in the core, and chemical layering above the core-mantle boundary (CMB), to obtain a successful thermal evolution of the core, i.e. one in which the magnetic field exists over geological time and the final inner core size matches that observed. The mantle convection model includes both the olivine and pyroxene phase change systems linked via the compositional field. The most successful core thermal evolution is obtained when the compositional density difference between subducted MORB and pyrolite in the deep mantle is 1.1% and the core contains 100 ppm radioactive potassium, both of which are consistent with estimates from laboratory experiments. In that scenario, the CMB heat flow at the present time is 8.5 TW, and the time-averaged ohmic dissipation is 2 TW. However, during the modeled magnetic evolution, the ohmic dissipation associated with the geodynamo occasionally becomes zero, which means that the geodynamo stops working, although these large fluctuations could be an artifact of two-dimensional geometry. Various model uncertainties still remain. Copyright 2005 by the American Geophysical Union. |
Persistent Identifier | http://hdl.handle.net/10722/264898 |
ISSN | 2023 Impact Factor: 2.9 2023 SCImago Journal Rankings: 1.457 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Nakagawa, Takashi | - |
dc.contributor.author | Tackley, Paul J. | - |
dc.date.accessioned | 2018-11-08T01:35:14Z | - |
dc.date.available | 2018-11-08T01:35:14Z | - |
dc.date.issued | 2005 | - |
dc.identifier.citation | Geochemistry, Geophysics, Geosystems, 2005, v. 6, n. 8 | - |
dc.identifier.issn | 1525-2027 | - |
dc.identifier.uri | http://hdl.handle.net/10722/264898 | - |
dc.description.abstract | A coupled model of thermochemical multiphase mantle convection and parameterized heat balance in the Earth's core is used to investigate the need for radioactive potassium in the core, and chemical layering above the core-mantle boundary (CMB), to obtain a successful thermal evolution of the core, i.e. one in which the magnetic field exists over geological time and the final inner core size matches that observed. The mantle convection model includes both the olivine and pyroxene phase change systems linked via the compositional field. The most successful core thermal evolution is obtained when the compositional density difference between subducted MORB and pyrolite in the deep mantle is 1.1% and the core contains 100 ppm radioactive potassium, both of which are consistent with estimates from laboratory experiments. In that scenario, the CMB heat flow at the present time is 8.5 TW, and the time-averaged ohmic dissipation is 2 TW. However, during the modeled magnetic evolution, the ohmic dissipation associated with the geodynamo occasionally becomes zero, which means that the geodynamo stops working, although these large fluctuations could be an artifact of two-dimensional geometry. Various model uncertainties still remain. Copyright 2005 by the American Geophysical Union. | - |
dc.language | eng | - |
dc.relation.ispartof | Geochemistry, Geophysics, Geosystems | - |
dc.subject | Multicomponent phase changes | - |
dc.subject | Thermal evolution | - |
dc.subject | Radioactive heating | - |
dc.subject | Core-mantle boundary | - |
dc.title | Deep mantle heat flow and thermal evolution of the Earth's core in thermochemical multiphase models of mantle convection | - |
dc.type | Article | - |
dc.description.nature | link_to_OA_fulltext | - |
dc.identifier.doi | 10.1029/2005GC000967 | - |
dc.identifier.scopus | eid_2-s2.0-33745862515 | - |
dc.identifier.volume | 6 | - |
dc.identifier.issue | 8 | - |
dc.identifier.spage | null | - |
dc.identifier.epage | null | - |
dc.identifier.eissn | 1525-2027 | - |
dc.identifier.isi | WOS:000231379800001 | - |
dc.identifier.issnl | 1525-2027 | - |