Journal
EARTH PLANETS AND SPACE
Volume 74, Issue 1, Pages -Publisher
SPRINGER
DOI: 10.1186/s40623-022-01608-3
Keywords
Mantle dynamics; Thermal conductivity; Lower mantle; Primordial reservoirs; Thermo-chemical mantle convection
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Funding
- National Natural Science Foundation of China (NSFC) [41888101]
- Chinese Academy of Sciences [132A11KYSB20200019]
- Key Research Program of the Institute of Geology and Geophysics, CAS [IGGCAS-201904]
- MoST [109-2116-M-001-029]
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The composition-dependent thermal conductivity of primordial dense material has a secondary role in the long-term evolution of Earth's mantle, but if the material is enriched in heat-producing elements, it slightly affects the height and coverage of these reservoirs.
The influence of composition-dependent thermal conductivity and heterogeneous internal heating of primordial dense material on the long-term evolution of primordial reservoirs in the lower mantle of the Earth is investigated utilizing thermochemical mantle convection simulations in a 2-D spherical annulus geometry. Our results show that a reduction in the thermal conductivity of primordial dense material due to iron enrichment does not substantially alter mantle dynamics nor the long-term stability of the reservoirs of this dense material. If the primordial dense material is also enriched in heat-producing elements, the average altitude of these reservoirs slightly increases as the thermal conductivity is reduced, therefore, covering smaller core-mantle boundary areas. Our study indicates that the composition-dependent thermal conductivity of primordial material plays a second order role in the long-term evolution of Earth's mantle.
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