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Geologic Principles

This overview delves into fundamental geologic principles illustrated in various diagrams, highlighting sequences of events and their chronological order. It discusses radiometric dating, focusing on U-Pb decay curves and the calculation of remaining daughter isotopes after four half-lives to determine sample age. Additionally, it examines the Potassium-Argon decay series, cross-cutting relationships, and how sedimentary strata ages can be assessed through correlation. Finally, it reflects on the revisions of the geological time scale and the factors influencing those changes.

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Geologic Principles

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Presentation Transcript

  1. Geologic Principles • What geologic principles are shown in this diagram?

  2. Sequences of Events: What is the order of each event shown?

  3. Radiometric Dating • U-Pb decay curve • How much of the daughter element is remaining after 4 half lives? • What is the age of the sample?

  4. Potassium-Argon Decay Series

  5. Parent and Daughter Nuclides

  6. Cross-Cutting Relationships, Superposition and Correlation • Determining the age of sedimentary strata by correlation

  7. Cross-Cutting Relationships • How old (numerical age) is rock unit A? • How old (numerical age) is rock unit B? • How old (numerical age) is rock unit C?

  8. Note the changes in the time scale as it was revised. What do you think are the reasons for this?

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