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Lecture 13

EATS1010 - The Dynamic Earth and Space Geodesy Lecture 13

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Earth, Space Science and Engineering
ESSE 1010
Gary Jarvis

Lecture 13 Potassium-Argon Dating 19K40  k-capture  18Ar40 Recall: t= (1/ λ) ln 0P /P) Need the ratio P0/P, but P0 cannot be measured Recall that D = P0 – P  P0 = P + D Equation becomes t = (1/ λ) ln [(P+D)/P] Or T = (1/λ) ln [1 +D/P] P D P + D t=0 P 0 P 0 0 t1 P0– 3 3 P0 t2 P0– 5 5 P0 t (now) P – P (0) P 3 0 0 t = time since D = 0 The age of a rock is the time since it was last solidified Rock melts - Ar gas bubbles to surface + escapes into atmosphere o Sets D = 0  Resets the age of the rock This technique is good for Igneous Rocks but doesn’t work for sedimentary rocks Sedimentary rocks are dated by using igneous rocks which are above or below the sedimentary rocks. 20>t My 60>t>30 t>60 60M 30M 20M Potassium-Argon Dating Radioactive dating for rocks only applies to igneous rocks. - not useful Igneous vs Sedimentary Rocks - Radiometric dating is only applicable igneous rocks i.e. rocks solidify from the molten state. - Erosion wears down igneous rocks and deposits sediments in low lying regions elsewhere erosion sediments deposits Sedimentar
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