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The Age of Things: Sticks, Stones and the Universe Meteorites and the Age of the Solar System http://cfcp.uchicago.edu/~mmhedman/compton1.html

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March 26, 2003 The Park Forest Meteorite Images from Simon et al Meteoritics and Planetary Science Vol 39 (2004)

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Different Types of Meteorites Iron Stony

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Different Types of Stony Meteorites Achondrite Chondrite

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WARNING! Astrophysicist talking about Meteorites!

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R R= Current amount of Radioactive Nuclei Original amount of Radioactive Nuclei

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Potassium 40 Argon 40 electron neutrino Potassium 40 Calcium 40 electron neutrino Potassium-Argon System 90% 10% ProtonNeutron

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Potassium-40Argon-40Calcium-40 Potassium 40 Calcium-40 The Original Rock The Rock Today

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R R= Current amount of Potassium-40 Original amount of Potassium-40 Half-Life of Potassium-40 is1.25 billion years

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Potassium-40 Argon-40 Calcium-40 Potassium-40 decay in molten rock

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Potassium-40 Argon-40 Calcium-40 Potassium-40 decay in solid rock

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Carbon 14Nitrogen 14 electron neutrino Rubidium-87 Strontium-87 electron neutrino Rubidium-Strontium System ProtonNeutron Half-life = 49 Billion Years Half-Life = 5700 Years

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Rubidium-Strontium Dating Rubidium-87 Strontium-87 Mineral 1 Today

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Rubidium-Strontium Dating Rubidium-87 Strontium-87 Mineral 1 Today Originally

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Rubidium-Strontium Dating Rubidium-87 Strontium-87 Mineral 1 Today Originally

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Strontium-86 Rubidium-87 Strontium-87 Mineral 1 Mineral 2

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Strontium-86Strontium-87 Mineral 1 Mineral 2

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Rubidium-Strontium Dating Rubidium-87 Strontium-87 Strontium-86 Mineral 1 Mineral 2 Today

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Rubidium-Strontium Dating Rubidium-87 Strontium-87 Strontium-86 Mineral 1 Mineral 2 Mineral 1 Mineral 2 Today 7 billion years ago

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Rubidium-Strontium Dating Rubidium-87 Strontium-87 Strontium-86 Mineral 1 Mineral 2 Mineral 1 Mineral 2 Today 3 billion years ago

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Rubidium-Strontium Isochron Plots

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Strontium-87/Strontium-86 Rubidium-87/Strontium-86 From McSween 2000 Meteorites and Their Parent Planets Rubidium-Strontium Ages

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Different Types of Stony Meteorites Achondrite Chondrite

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Dust and Gas Chondrules, etc. Condensation, Melting, Evaporation Aggregation Chondritic Objects Melting, Differentiation Achondritic Objects Planets Aggregation Fragmentation Chondrite Achondrite Iron Meteoroids

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Carbon 14Nitrogen 14 electron neutrino Aluminum-26 System ProtonNeutron Half-Life = 5700 Years Aluminum-26Magnesium-26 positron neutrino Half-Life = 700,000 Years

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Magnesium-24 Aluminum-27 Magnesium-26 Aluminum-26

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Magnesium-24 Aluminum-27 Magnesium-26 Aluminum-26

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Magnesium-24 Aluminum-27 Magnesium-26 Aluminum-26

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Magnesium-24Aluminum-27Magnesium-26

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Magnesium-24Aluminum-27Magnesium-26

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Aluminum-26 Dating Aluminum-27Magnesium-26Magnesium-24 Mineral 1 Mineral 2 Today Aluminum-26

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Aluminum-26 Dating Aluminum-27Magnesium-26Magnesium-24 Mineral 1 Mineral 2 Mineral 1 Mineral 2 Today Originally Aluminum-26

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Aluminum-26 Isochron Plot Aluminum-27/ Magnesium-24 Magnesium-26/ Magnesium-24

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Aluminum-26 Isochron Plot Aluminum-27/ Magnesium-24 Magnesium-26/ Magnesium-24

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Aluminum-26 Isochron Plot Aluminum-27/ Magnesium-24 Magnesium-26/ Magnesium-24

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Aluminum-27/ Magnesium-24 Magnesium-26/ Magnesium-24 From Hutcheon 1982 in Nuclear and Chemical Dating Techniques More Aluminum-26 Aluminum-26 Achondrite Chondrule Relative Dating from Aluminum-26

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Aluminum-27/ Magnesium-24 Magnesium-26/ Magnesium-24 From Hutcheon 1982 in Nuclear and Chemical Dating Techniques Aluminum-26 Achondrite Chondrule CAI Relative Dating from Aluminum-26 More Aluminum-26 Chondrule Calcium-Aluminum-Rich Inclusion

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Aluminum-27/ Magnesium-24 Magnesium-26/ Magnesium-24 From Hutcheon 1982 in Nuclear and Chemical Dating Techniques 05 1015 -5-10 Millions of Years Aluminum-26 Achondrite Chondrule CAI Relative Dating from Aluminum-26 Chondrule Calcium-Aluminum-Rich Inclusion

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Uranium-Lead System Uranium-235 Thorium-231 Protactinium-231 Actinium-227 Thorium-227 Radium-223 Radon-219 Polonium-215 Lead-211 Bismuth-211 Polonium-211 Thallium-207 Lead-207 Uranium-238 Thorium-234 Protactinium-234 Uranium-234 Thorium-230 Radium-226 Radon-222 Polonium-218 Lead-214 Bismuth-214 Polonium-214 Thallium-210 Lead-210 Bismuth-210 Polonium-210 Lead-206 Half-Life = 700 Million Years Half-Life = 4.5 Billion Years

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Lead 204 Uranium-235 Lead 207 Uranium-238 Lead 206

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Lead-Lead Isochron Plot

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Lead 204/Lead 206 Lead 207/Lead 206 From Amelin et al 2002 Science 297 p 1678 4575 4570 456545604555 4550 Millions of Years Lead Isochron Achondrite Lead-Lead Isochron Dates

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Lead 207/Lead 206 4575 4570 456545604555 4550 Millions of Years Lead Isochron Achondrite Chondrules CAI Lead-Lead Isochron Dates Lead 204/Lead 206 Chondrule Calcium-Aluminum-Rich Inclusion From Amelin et al 2002 Science 297 p 1678

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Lead 204/Lead 206 Lead 207/Lead 206 4575 4570 456545604555 4550 05 1015 -5-10 Millions of Years Aluminum-26 Millions of Years Lead Isochron Achondrite Chondrules CAI Lead-Lead Isochron Dates Chondrule Calcium-Aluminum-Rich Inclusion From Amelin et al 2002 Science 297 p 1678

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Next time: Colors, Brightness and the Age of Stars

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8.3 Radioactive Dating.

8.3 Radioactive Dating.

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