Absolute Dating GEOL 1210
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This 2 page Class Notes was uploaded by Vani Singh on Sunday March 6, 2016. The Class Notes belongs to GEOL 1210 at University of North Carolina - Charlotte taught by in Spring 2016. Since its upload, it has received 41 views. For similar materials see Earth History in Earth Sciences at University of North Carolina - Charlotte.
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Date Created: 03/06/16
Absolute Dating Numerical Age: Names of the periods of geological time were set without numerical value and based on the fossil occurrences Tool to place numerical value: Radioactive Decay (isotopes) Isotopes to reach a stable state from instability Emit Alpha Particles: 2 protons & 2 neutrons results in the change of element because atomic number changes higher Ex. Potassium Argon Emit Beta Particles: Neutron releases an electron Result: proton formation from break down (change of element because atomic number changes higher) Electron Capture: electron collides with nucleus and attaches to a proton formation of electron Result: element changes, but lower on periodic table, NOT higher 1 HalfLife: time for 2 of a nuclei to decay & as the parent decreases, the daughter increases HalfLife Parent Daughter 1 50% 50% 2 25% 75% 3 12.5% 87.5% **Each isotope has its own unique halflife Carbon14: 5740 year halflife (shortest halflife) Radiometric Dating: Crystals: Parent & Daughter not the same size, once formation is complete becomes a closed system Blocking Temperature: Closed System Higher than the Blocking Temperature: system opens up & allows Daughter crystals to leave, while Parent crystals remain, therefore the structure of the crystal remains Higher > Blocking Temperature resets the time to determine age of crystal Dating Material: grade of metamorphism **Understand the thermal history of rocks because of the resetting of the time Dating Techniques: Sedimentary Rocks: not datable (for the most part) Why so? Sedimentary rocks are composed of parts of sediments & minerals stuck together Several intervals of history joined together Carbon14 Dating: not for dating minerals, but parts of organisms: teeth, bones, wood N14 (stable) C14 (unstable) Solar Radiation Starts converting Three Carbon Isotopes to N14 C12 C13 C14
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