Dateringsmetoder

Question 1

Oxygen isotopes

Answer 1

Data deep sea cores:
OIM - oxygen isotope stages
MIS - marine isotope stages

Data from ice cores:

Question 2

Magnetostratigraphy

Answer 2

Magnetic minerals aligned according to Earth’s magnetic field at the time

Question 3

Radiocarbon dating (!)

Answer 3

Carbon-14 dating
(Half-life 5730)
Range 300-50.000 yrs

Indirect dating of glacial deposits

Question 4

Potassium/argon dating

Answer 4

Ar-40 and Ca-40
Feldspars and micas - vulcanic deposits only(?)
3-5 Ma

Indirect dating of glacial deposits

Question 5

Uranium/thorium

Answer 5

Uranium-234 and Thorium-240
500.000 ka
Carbonate -bearing materials

Question 6

Fission track dating

Answer 6

Track density in relation to uranium content

Hornblende, apatite, zircon, volcanic glass

Tend to heal…

Question 7

Luminescence dating

Answer 7

Thermoluminescence (TL)
Optically stimulated luminescence (OSL)
Electron spin resonance (ESR)

100ka

Question 8

Beryllium dating

Answer 8

Be-10
Exposure dating (how long surface exposed) - deglaciation ages

15Ma

Question 9

Amino acid dating

Answer 9

Proteins L-isomeres transforms into D-isomeres after death
- L/D ratio

Question 10

Dendrochronology

Answer 10

Counting tree rings
8000yrs

Question 11

Varve chronology

Answer 11

?
Freshwater stratification
Deglaciation chronologies
12ka