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- Publisher Website: 10.1016/j.pepi.2017.05.011
- Scopus: eid_2-s2.0-85020082278
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Article: On the thermo-chemical origin of the stratified region at the top of the Earth's core
Title | On the thermo-chemical origin of the stratified region at the top of the Earth's core |
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Authors | |
Keywords | Chemical diffusivity Stable region Thermochemical evolution Core-mantle chemical coupling CMB heat flow |
Issue Date | 2018 |
Citation | Physics of the Earth and Planetary Interiors, 2018, v. 276, p. 172-181 How to Cite? |
Abstract | © 2017 Elsevier B.V. I developed a combined model of the thermal and chemical evolution of the Earth's core and investigated its influence on a thermochemically stable region beneath the core-mantle boundary (CMB). The chemical effects of the growing stable region are caused by the equilibrium chemical reaction between silicate and the metallic core. The thermal effects can be characterized by the growth of the sub-isentropic shell, which may have a rapid growth rate compared to that of the chemically stable region. When the present-day CMB heat flow was varied, the origin of the stable region changed from chemical to thermochemical to purely thermal because the rapid growth of the sub-isentropic shell can replace the chemically stable region. Physically reasonable values of the present-day CMB heat flow that can maintain the geodynamo action over 4 billion years should be between 8 and 11 TW. To constrain the thickness of the thermochemically stable region beneath the CMB, the chemical diffusivity is important and should be ∼O(10−8) m2/s to obtain a thickness of the thermochemically stable region beneath the CMB consistent with that inferred from geomagnetic secular variations (140 km). However, the strength of the stable region found in this study is too high to be consistent with the constraint on the stability of the stable region inferred from geomagnetic secular variations. |
Persistent Identifier | http://hdl.handle.net/10722/264999 |
ISSN | 2023 Impact Factor: 2.4 2023 SCImago Journal Rankings: 0.823 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Nakagawa, Takashi | - |
dc.date.accessioned | 2018-11-08T01:35:32Z | - |
dc.date.available | 2018-11-08T01:35:32Z | - |
dc.date.issued | 2018 | - |
dc.identifier.citation | Physics of the Earth and Planetary Interiors, 2018, v. 276, p. 172-181 | - |
dc.identifier.issn | 0031-9201 | - |
dc.identifier.uri | http://hdl.handle.net/10722/264999 | - |
dc.description.abstract | © 2017 Elsevier B.V. I developed a combined model of the thermal and chemical evolution of the Earth's core and investigated its influence on a thermochemically stable region beneath the core-mantle boundary (CMB). The chemical effects of the growing stable region are caused by the equilibrium chemical reaction between silicate and the metallic core. The thermal effects can be characterized by the growth of the sub-isentropic shell, which may have a rapid growth rate compared to that of the chemically stable region. When the present-day CMB heat flow was varied, the origin of the stable region changed from chemical to thermochemical to purely thermal because the rapid growth of the sub-isentropic shell can replace the chemically stable region. Physically reasonable values of the present-day CMB heat flow that can maintain the geodynamo action over 4 billion years should be between 8 and 11 TW. To constrain the thickness of the thermochemically stable region beneath the CMB, the chemical diffusivity is important and should be ∼O(10−8) m2/s to obtain a thickness of the thermochemically stable region beneath the CMB consistent with that inferred from geomagnetic secular variations (140 km). However, the strength of the stable region found in this study is too high to be consistent with the constraint on the stability of the stable region inferred from geomagnetic secular variations. | - |
dc.language | eng | - |
dc.relation.ispartof | Physics of the Earth and Planetary Interiors | - |
dc.subject | Chemical diffusivity | - |
dc.subject | Stable region | - |
dc.subject | Thermochemical evolution | - |
dc.subject | Core-mantle chemical coupling | - |
dc.subject | CMB heat flow | - |
dc.title | On the thermo-chemical origin of the stratified region at the top of the Earth's core | - |
dc.type | Article | - |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1016/j.pepi.2017.05.011 | - |
dc.identifier.scopus | eid_2-s2.0-85020082278 | - |
dc.identifier.volume | 276 | - |
dc.identifier.spage | 172 | - |
dc.identifier.epage | 181 | - |
dc.identifier.isi | WOS:000425198900015 | - |
dc.identifier.issnl | 0031-9201 | - |