Assume no daughter product initially assume we know

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Assume no daughter product initially Assume we know half- life accurately Assume system remains closed No parent isotope escapes No daughter isotope escapes
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Useful isotope systems
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Basic principles for interpretation of rock record Principle of superposition
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Basic principles for interpretation of rock record Principle of superposition
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Basic principles for interpretation of rock record Principle of superposition
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Basic principles for interpretation of rock record Principle of superposition
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Basic principles for interpretation of rock record Principle of superposition
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Basic principles for interpretation of rock record Principle of superposition
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Basic principles for interpretation of rock record Principle of superposition
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01/19/2012 22
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01/19/2012 23
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01/19/2012 24 Earth keeps going and going and going ...
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Archean Eon (4.0-2.5 Ga) Continental area
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01/19/2012 26 Isostasy = like ice cubes floating in water = less dense and thicker continental crust sticks up higher than more dense and thinner oceanic crust
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01/19/2012 27 This suggests that continental and oceanic crust lie on top of a liquid-like layer of rocks
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01/19/2012 28 Earth’s interior
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01/19/2012 29 Snider-Pellegrini, 1858, again, demonstrates that Atlantic ocean can
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