Experimental evidence that potassium is a substantial radioactive heat source in planetary cores

@article{Murthy2003ExperimentalET,
  title={Experimental evidence that potassium is a substantial radioactive heat source in planetary cores},
  author={V. Rama Murthy and Wim van Westrenen and Yingwei Fei},
  journal={Nature},
  year={2003},
  volume={423},
  pages={163-165}
}
The hypothesis that 40K may be a significant radioactive heat source in the Earth's core was proposed on theoretical grounds over three decades ago, but experiments have provided only ambiguous and contradictory evidence for the solubility of potassium in iron-rich alloys. The existence of such radioactive heat in the core would have important implications for our understanding of the thermal evolution of the Earth and global processes such as the generation of the geomagnetic field, the core… 

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References

SHOWING 1-10 OF 29 REFERENCES

Estimates of heat flow in the deep mantle based on the power requirements for the geodynamo

Regeneration of the magnetic field by convection in the core places demands on heat flow into the base of the mantle. If the heat flow is too low, thermal convection is shut off and the rate of

Influence of early plate tectonics on the thermal evolution and magnetic field of Mars

Recent magnetic studies of Mars suggest that (1) it possessed a periodically reversing magnetic field for the first ∼500 Myr of its existence and (2) plate tectonics may have been operating during

Metal-silicate equilibrium in a homogeneously accreting earth: new results for Re

Thermal evolution of the Earth's core

Summary. The persistence of the magnetic field of the Earth demands a constant energy source for the last three thousand million years, and this provides a constraint on the thermal evolution of the

Mars' core and magnetism

The detection of strongly magnetized ancient crust on Mars is one of the most surprising outcomes of recent Mars exploration, and provides important insight about the history and nature of the

Parameterized thermal convection in a layered region and the thermal history of the Earth

Parameterized convective schemes for constant viscosity fluids are used to investigate the influence of layering on the relationship between the rate of heat loss from and heat supply to a number of

Consequences of the presence of sulfur in the core of the earth