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THE LANGUAGE OF THE EARTH – PART VII

THE LANGUAGE OF THE EARTH – PART VII. Geochronology Methods for Determining the Relative and Absolute Age of Rocks. Relative Age Dating - Superposition. Principles of Faunal Succession and Faunal Assemblage. Index Fossils - Widespread distribution - Restricted, known time of existence

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THE LANGUAGE OF THE EARTH – PART VII

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  1. THE LANGUAGE OF THE EARTH – PART VII Geochronology Methods for Determining the Relative and Absolute Age of Rocks

  2. Relative Age Dating - Superposition

  3. Principles of Faunal Successionand Faunal Assemblage Index Fossils - Widespread distribution - Restricted, known time of existence - Common to many environments

  4. Principle of Cross-cutting Relationships

  5. Global Time MarkersVolcanic Ash Eruptions

  6. Global Time MarkersMagnetic Reversals

  7. Global Time MarkersMeteor Impacts K-T Boundary mudstone-impact layer coal K-T impact site

  8. Global Time MarkersClimate Change

  9. Gaps in the Geological RecordUnconformities

  10. Creating Unconformities

  11. Gaps in the Minnesota Timescale

  12. Regional Correlation of UnitsPiecing the Rock Record Together

  13. Absolute Age DeterminationsRadiometric Dating

  14. Radioactive Isotopes

  15. Radioactive Decay

  16. Radioactive Decay Half-life Zircon ZrSiO4 U substitutes for Zr, but Pb does not.

  17. Rb-Sr Dating of a Granite 87Rb 87Sr; 86Sr is stable Rb – chemically substitutes for K Sr – chemically substitutes for Ca Isochron t=2 t=1 87Sr/86Sr Metamorphism at t=1 87Sr/86Sr°(m) t=0 87Sr/86Sr° 87Rb/86Sr Ca-plagioclase Granite whole rock K-feldspar Biotite (K-rich)

  18. GEOPUZZLE 1

  19. GEOPUZZLE 2

  20. GEOPUZZLE 3

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