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Radiogenic Isotope Geochemistry

Radiogenic Isotope Geochemistry. And Its Importance To Geologic History. Isotopes. Atoms which differ only in the number of neutrons present in the nucleus. Radioactive Decay: Alpha . Loss of alpha particle from the nucleus Alpha particle includes 2 protons, 2 neutrons

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Radiogenic Isotope Geochemistry

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  1. Radiogenic Isotope Geochemistry And Its Importance To Geologic History

  2. Isotopes Atoms which differ only in the number of neutrons present in the nucleus.

  3. RadioactiveDecay: Alpha • Loss of alpha particle from the nucleus • Alpha particle includes 2 protons, 2 neutrons • Atomic number decreases by 2, mass decreases by 4

  4. RadioactiveDecay: Beta • Loss of an electron from a neutron, not from outer most energy level • Atomic number increases by 1

  5. RadioactiveDecay: Electron Capture • Proton captures an electron from outside source • Atomic number decreases by 1 Example: Potassium-Argon Decay

  6. Bohr’s Model of the Atom

  7. Isotope Half-Life

  8. Mass Spectrometer The Baylor Brooks Laboratory San Diego State University VG Sector 54, seven-collector thermal ionization mass spectrometer

  9. How It Works… The Basics

  10. A more advanced look…

  11. Diffusion:How and Why? • Inability to maintain structure • Melting • Metamorphism • Weathering and Alteration • Recrystallization • Reheating • Physical Damage

  12. Importance of a Closed System

  13. Closed System: Mineral Examples

  14. Closed System: Mineral Examples

  15. Yukon-Tanana

  16. Portage, Alaska

  17. Polychrome Mountain, Denali, Alaska

  18. Polychrome Mountain, Denali, Alaska

  19. Polychrome Mountain, Denali, Alaska

  20. Denali, Alaska

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