Multidisciplinary Constraints on the Thermal-Chemical Boundary Between Earth's Core and Mantle
Authors
Martin, JF
Publication Date
2022Journal Title
Geochemistry, Geophysics, Geosystems
ISSN
1525-2027
Publisher
American Geophysical Union (AGU)
Language
en
Type
Article
This Version
AO
VoR
Metadata
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Frost, D., Avery, M., Buffett, B., Chidester, B., Deng, J., Dorfman, S., Li, Z., et al. (2022). Multidisciplinary Constraints on the Thermal-Chemical Boundary Between Earth's Core and Mantle. Geochemistry, Geophysics, Geosystems https://doi.org/10.1029/2021GC009764
Abstract
Abstract: Heat flux from the core to the mantle provides driving energy for mantle convection thus powering plate tectonics, and contributes a significant fraction of the geothermal heat budget. Indirect estimates of core‐mantle boundary heat flow are typically based on petrological evidence of mantle temperature, interpretations of temperatures indicated by seismic travel times, experimental measurements of mineral melting points, physical mantle convection models, or physical core convection models. However, previous estimates have not consistently integrated these lines of evidence. In this work, an interdisciplinary analysis is applied to co‐constrain core‐mantle boundary heat flow and test the thermal boundary layer (TBL) theory. The concurrence of TBL models, energy balance to support geomagnetism, seismology, and review of petrologic evidence for historic mantle temperatures supports QCMB ∼15 TW, with all except geomagnetism supporting as high as ∼20 TW. These values provide a tighter constraint on core heat flux relative to previous work. Our work describes the seismic properties consistent with a TBL, and supports a long‐lived basal mantle molten layer through much of Earth's history.
Keywords
GEOCHEMISTRY, Geochemical modeling, GEODESY AND GRAVITY, Earth's interior: composition and state, Earth's interior: dynamics, GEOMAGNETISM AND PALEOMAGNETISM, Core processes, MINERALOGY AND PETROLOGY, SEISMOLOGY, Mantle, Core, TECTONOPHYSICS, Continental margins: divergent, Dynamics of lithosphere and mantle: general, VOLCANOLOGY, Research Article, heat budget, thermal boundary layer, petrology, geodynamics, geomagnetics, seismology
Sponsorship
European Research Council (804071)
Identifiers
ggge22758, 2021gc009764
External DOI: https://doi.org/10.1029/2021GC009764
This record's URL: https://www.repository.cam.ac.uk/handle/1810/334516
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Licence:
http://creativecommons.org/licenses/by/4.0/
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