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- W3046253711 abstract "Abstract Earth's continental crust is characterized by a strong enrichment in long‐lived radioactive isotopes. Recent estimates suggest that the continental crust contributes to 33% of the heat released at the surface of the Earth, while occupying less than 1% of the mantle. This distinctive feature has profound implications for the underlying mantle by impacting its thermal structure and heat transfer. However, the effects of a continental crust enriched in heat‐producing elements on the underlying mantle have not yet been systematically investigated. Here, we conduct a preliminary investigation by considering a simplified convective system consisting in a mixed heated fluid where all the internal heating is concentrated in a top layer of thickness d HL (referred to as “heat‐blanketed convection”). We perform 24 numerical simulations in three dimensional Cartesian geometry for four specific set‐ups and various values of d HL . Our results suggest that the effects of the heated layer strongly depend on its thickness relative to the thickness of the thermal boundary layer ( δ TBL ) in the homogeneous heating case ( d HL = 1.0). More specifically, for d HL > δ TBL , the effects induced by the heated layer are quite modest, while, for d HL < δ TBL , the properties of the convective system are strongly altered as d HL decreases. In particular, the surface heat flux and convective vigor are significantly enhanced for very thin heated layers compared to the case d HL = 1.0. The vertical distribution of heat producing elements may therefore play a key role in mantle dynamics. For Earth, the presence of continents should however not affect significantly the surface heat flux, and thus the Earth's cooling rate." @default.
- W3046253711 created "2020-08-07" @default.
- W3046253711 creator A5072727381 @default.
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- W3046253711 date "2021-02-01" @default.
- W3046253711 modified "2023-10-12" @default.
- W3046253711 title "Heat‐Blanketed Convection and its Implications for the Continental Lithosphere" @default.
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- W3046253711 doi "https://doi.org/10.1029/2020jb020695" @default.
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