Potassium dating calculator lgr radio dating

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When the rock is melted by volcanic processes, the argon becomes mobile and typically separates from the molten rock.When the rock solidifies, it starts off with no argon.The total mass of the argon in the Earth's atmosphere is (total mass of atmosphere) x 1.3% = (5.1 x 10 kg argon in the atmosphere Thus, the amount of argon in the atmosphere is about 1.4% of the amount of argon-40 produced in the Earth's crust over the past 4.5 billion years.Most of the argon produced in the crust remains locked in the rock.

The decay of potassium-40 to argon-40 explains why there is so much argon in the atmosphere, compared with the other noble gases.Only about 1.4% has escaped and entered the atmosphere.Note: The calculations have a precision of two significant digits.Almost all atmospheric argon (99.6%) is argon-40, whereas the argon in the Sun and stars, produced by stellar nucleosynthesis, is mostly argon-36.This suggests that primordial argon is in the form of argon-36 and essentially all of the argon in the atmosphere was produced by the decay of potassium-40 to argon-40.

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