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Of course there seem to me to be fairly reasonable explanations for this observation which may allow for more slowly forming granitic rocks.For instance, polonium radiohalos are sometimes associated with polonium bands generated by the polonium being transported by hydrothermal fluids along fractures.Chamberlain (1899) pointed out that Kelvin's calculations were only as good as the assumptions on which they were based.

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However, on the whole, he thought that these sources were not adequate to account for anything more than a small faction of the heat lost by the Earth.His result was in close agreement with his estimate of the age of the earth.The solar estimate was based on the idea that the energy supply for the solar radioactive flux is gravitational contraction.Potassium - Argon and Argon - Argon dating are based on the current understanding that radioactive Potassium-40 decays to the stable form, Argon-40 with a half-life of approximately 1.25 billion years.There are some circumstances that can affect this rate such as magnetic fluctuations etc...

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