Dating II Spring 2010

Dating II Spring 2010 - Dating Techniques The two basic...

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Dating Techniques The two basic categories of dating techniques are: don’t know actual years. only know it is OLDER THAN or YOUNGER THAN something else Absolute: Relative: date in years or range of years
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Absolute Dating Techniques Radiometric techniques: Radiocarbon (C14) and AMS dating Potassium/Argon (K/Ar) or Argon/Argon (Ar/Ar) Other techniques: (will be covered in sections) Dendrochronology (tree ring dating) Archaeomagnetism Electron Spin Resonance (ESR)
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Absolute Dating Techniques Radiocarbon or C14 Three heavy carbon isotopes: C12, C13, and C14 Carbon isotopes form our tissues and organs British Museum We are a carbon-based planet: During life, an organism takes in C isotopes After death, no C taken in
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After death of the organism: C12 and C13 are stable – can be used to reconstruct the diet of the organism C14 is unstable, with a half life of 5,730 years Dependable for dating only when not too recent; Upper limit only to 50,000-60,000 years ago i.e., 5,730 after an organism dies, half the C14 isotopes taken in during life will have degraded In another 5,730 years, half of those will have degraded
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Radiocarbon Must be organic
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This note was uploaded on 10/04/2011 for the course ANTH 101 taught by Professor Simmons during the Spring '06 term at South Carolina.

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Dating II Spring 2010 - Dating Techniques The two basic...

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