K, U and Th in mid-ocean ridge basalt glasses and heat production, K/U and K/Rb in the mantle

@article{Jochum1983KUA,
  title={K, U and Th in mid-ocean ridge basalt glasses and heat production, K/U and K/Rb in the mantle},
  author={Klaus Peter Jochum and Albrecht W. Hofmann and E. Ito and H. M. Seufert and William M. White},
  journal={Nature},
  year={1983},
  volume={306},
  pages={431-436}
}
Analyses on fresh glass samples of mid-ocean ridge basalt yield a uniform ratio K/U = 12,700 ± 200. In contrast, Th/U increases systematically with Th concentration. From these results we calculate an upper limit (1.5 pW kg−1) and a best estimate (0.6 pW kg−1) for the heat production in the depleted portion of the mantle. A new estimate is given for the terrestrial ratio of K/Rb = 513. 

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