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Water-induced mantle overturn explains high Archean paleointensities
Dong Wang1, Zhongqing Wu1,2
1State Key Laboratory of Precision Geodesy, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China.
None:
As a consequence of the evolution of the water-bearing basal magma ocean, water-induced mantle overturn can suitably explain many puzzling observations in the Archean, including the formation of continents and the Archean-Proterozoic boundary. The upwelling of the hot basal magma ocean during mantle overturn drastically affects the thermal state of the core-mantle boundary and geomagnetic field. We model the thermal evolution of the core-mantle boundary to investigate the effects of mantle overturn on the geomagnetic field. Our results demonstrate that mantle overturn substantially accelerates core cooling and increases heat flow across the core-mantle boundary. Such enhanced heat flow would have strengthened the geomagnetic field, which explains well the high paleointensity records from ∼3.5 to 2.5 Ga. The strong geodynamo and formation of Archean continents generate a concordant picture of the evolution of water-induced mantle overturn.
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