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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
March 26, 2003 The Park Forest Meteorite
Images from Simon et al Meteoritics and Planetary Science Vol 39 (2004)
Different Types of Meteorites
Iron
Stony
Different Types of Stony Meteorites
Achondrite
Chondrite
WARNING!
Astrophysicist talkingabout
Meteorites!
R
R=Current amount of Radioactive Nuclei
Original amount of Radioactive Nuclei
Potassium 40 Argon 40
electron neutrino
Potassium 40 Calcium 40
electron
neutrino
Potassium-Argon System
90%
10%
Proton Neutron
Potassium-40 Argon-40 Calcium-40
Potassium 40 Calcium-40
The Original Rock
The Rock Today
R
R=Current amount of Potassium-40
Original amount of Potassium-40
Half-Life of Potassium-40 is1.25 billion years
Carbon 14 Nitrogen 14
electron
neutrino
Rubidium-87 Strontium-87
electron
neutrino
Rubidium-Strontium System Proton Neutron
Half-life = 49 Billion Years
Half-Life = 5700 Years
Rubidium-Strontium Dating
Rubidium-87 Strontium-87
Mineral 1
Today
Rubidium-Strontium Dating
Rubidium-87 Strontium-87
Mineral 1
Mineral 1
Today
Originally
Rubidium-Strontium Dating
Rubidium-87 Strontium-87
Mineral 1
Mineral 1
Today
Originally
Strontium-86Rubidium-87
Strontium-87Mineral 1
Mineral 2
Rubidium-Strontium Dating
Rubidium-87 Strontium-87 Strontium-86
Mineral 1
Mineral 2
Today
Rubidium-Strontium Dating
Rubidium-87 Strontium-87 Strontium-86
Mineral 1
Mineral 2
Mineral 1
Mineral 2
Today
7 billion years ago
Rubidium-Strontium Dating
Rubidium-87 Strontium-87 Strontium-86
Mineral 1
Mineral 2
Mineral 1
Mineral 2
Today
3 billion years ago
Rubidium-Strontium Isochron Plots
QuickTime™ and aGIF decompressor
are needed to see this picture.
Rubidium-Strontium Isochron Plots
Rubidium-Strontium Isochron Plots
Str
on
tiu
m-8
7/S
tro
nti
um
-86
Rubidium-87/Strontium-86
From McSween 2000 Meteorites and Their Parent Planets
Rubidium-Strontium Ages
Different Types of Stony Meteorites
Achondrite
Chondrite
Dust and Gas
Chondrules, etc.
Condensation, Melting, Evaporation
Aggregation
“Chondritic” Objects
Melting, Differentiation
“Achondritic” Objects
Planets Aggregation
FragmentationChondrite
Achondrite Iron
Meteoroids
Carbon 14 Nitrogen 14
electron
neutrino
Aluminum-26 System Proton Neutron
Half-Life = 5700 Years
Aluminum-26 Magnesium-26
positron
neutrino
Half-Life = 700,000 Years
Magnesium-24Aluminum-27
Magnesium-26Aluminum-26
Magnesium-24Aluminum-27
Magnesium-26Aluminum-26
Magnesium-24Aluminum-27
Magnesium-26Aluminum-26
Magnesium-24 Aluminum-27Magnesium-26
Aluminum-26 Dating
Aluminum-27 Magnesium-26 Magnesium-24
Mineral 1
Mineral 2
Today
Aluminum-26
Aluminum-26 Dating
Aluminum-27 Magnesium-26 Magnesium-24
Mineral 1
Mineral 2
Mineral 1
Mineral 2
Today
Originally
Aluminum-26
Aluminum-26 Isochron Plot
Aluminum-27/ Magnesium-24
Mag
nes
ium
-26/
Mag
nes
ium
-24
Aluminum-26 Isochron Plot
Aluminum-27/ Magnesium-24
Mag
nes
ium
-26/
Mag
nes
ium
-24
Aluminum-26 Isochron Plot
Aluminum-27/ Magnesium-24
Mag
nes
ium
-26/
Mag
nes
ium
-24
Aluminum-27/ Magnesium-24
Mag
nes
ium
-26/
Mag
nes
ium
-24
From Hutcheon 1982 in Nuclear and Chemical Dating Techniques
More Aluminum-26
Aluminum-26
AchondriteChondrule
Relative Dating from Aluminum-26
Aluminum-27/ Magnesium-24
Mag
nes
ium
-26/
Mag
nes
ium
-24
From Hutcheon 1982 in Nuclear and Chemical Dating Techniques
Aluminum-26
AchondriteChondruleCAI
Relative Dating from Aluminum-26
More Aluminum-26
Chondrule
Calcium-Aluminum-Rich Inclusion
Aluminum-27/ Magnesium-24
Mag
nes
ium
-26/
Mag
nes
ium
-24
From Hutcheon 1982 in Nuclear and Chemical Dating Techniques
0 5 10 15-5-10 Millions of Years
Aluminum-26
AchondriteChondruleCAI
Relative Dating from Aluminum-26
Chondrule
Calcium-Aluminum-Rich Inclusion
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
Lead 204
Uranium-235
Lead 207Uranium-238
Lead 206
Lead-Lead Isochron Plot
QuickTime™ and aGIF decompressor
are needed to see this picture.
Lead-Lead Isochron Plot
Lead-Lead Isochron Plot
QuickTime™ and aGIF decompressor
are needed to see this picture.
Lead-Lead Isochron Plot
Lead-Lead Isochron Plot
Lead 204/Lead 206
Lea
d 2
07/L
ead
206
From Amelin et al 2002 Science 297 p 1678
4575 4570 4565 4560 4555 4550 Millions of Years
Lead Isochron
Achondrite
Lead-Lead Isochron Dates
Lea
d 2
07/L
ead
206
4575 4570 4565 4560 4555 4550 Millions of Years
Lead Isochron
Achondrite
ChondrulesCAI
Lead-Lead Isochron Dates
Lead 204/Lead 206
Chondrule
Calcium-Aluminum-Rich Inclusion
From Amelin et al 2002 Science 297 p 1678
Lead 204/Lead 206
Lea
d 2
07/L
ead
206
4575 4570 4565 4560 4555 4550
0 5 10 15-5-10 Millions of Years
Aluminum-26
Millions of Years
Lead Isochron
Achondrite
ChondrulesCAI
Lead-Lead Isochron Dates
Chondrule
Calcium-Aluminum-Rich Inclusion
From Amelin et al 2002 Science 297 p 1678
Next time:
Colors, Brightness and the Age of Stars
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