Lecture 8 Geology 110
Table of Contents
- Earth Materials as Time Keepers
- Why study the ages of rocks?
- Why study the ages of rocks?
- Why study the ages of rocks?
- Why study the ages of rocks?
- Why study the ages of rocks?
- Why study the ages of rocks?
- Why study the ages of rocks?
- Why study the ages of rocks?
- Why study the ages of rocks?
- Why study the ages of rocks?
- Why study the ages of rocks?
- Why study the ages of rocks?
- 7.1 How do you determine the order of events?
- 7.1 How do you determine the order of events?
- 7.2 How are geologic events placed in relative order?
- 7.2 How are geologic events placed in relative order?
- 7.2 How are geologic events placed in relative order?
- 7.2 How are geologic events placed in relative order?
- 7.2 How are geologic events placed in relative order?
- 7.2 How are geologic events placed in relative order?
- 7.3 How do geologists determine the relative ages of rocks in widely separated places?
- 7.3 How do geologists determine the relative ages of rocks in widely separated places?
- 7.3 How do geologists determine the relative ages of rocks in widely separated places?
- 7.3 How do geologists determine the relative ages of rocks in widely separated places?
- 7.3 How do geologists determine the relative ages of rocks in widely separated places?
- 7.3 How do geologists determine the relative ages of rocks in widely separated places?
- 7.4 How was the geologic time scale constructed?
- 7.4 How was the geologic time scale constructed?
- The Geologic Time Scale
- 7.4 How was the geologic time scale constructed?
- 7.4 How was the geologic time scale constructed?
- 7.5 How do you recognize gaps in the rock record?
- 7.5 How do you recognize gaps in the rock record?
- 7.5 How do you recognize gaps in the rock record?
- 7.5 How do you recognize gaps in the rock record?
- 7.6 How have scientists determined the age of Earth?
- 7.6 How have scientists determined the age of Earth?
- 7.6 How have scientists determined the age of Earth?
- 7.6 How have scientists determined the age of Earth?
- 7.6 How have scientists determined the age of Earth?
- 7.6 How have scientists determined the age of Earth?
- 7.6 How have scientists determined the age of Earth?
- 7.7 How is the absolute age of a rock determined?
- 7.7 How is the absolute age of a rock determined?
- 7.7 How is the absolute age of a rock determined?
- Validating the method
- Validating the method
- Applying the method
- 7.7 How is the absolute age of a rock determined?
- 7.7 How is the absolute age of a rock determined?
- Absolute and Relative Age Dating
- Combining Absolute and Relative Age Dating
- Age of Earth
- 7.7 How is the absolute age of a rock determined?
- 7.8 How do we know ... how to determine half-lives and decay rates?
- 7.8 How do we know ... how to determine half-lives and decay rates?
- 7.8 How do we know ... how to determine half-lives and decay rates?
- 7.9 How do you reconstruct geologic history with rocks?
- 7.9 How do you reconstruct geologic history with rocks?
- Reconstructing Geologic History
- Geologic History cross section
- 7.9 How do you reconstruct geologic history with rocks?
Text and Images from Slide
7.7 How is the absolute age of a rock determined?
- Radioactive dating methods provide absolute ages of minerals using the parent (unstable)/daughter (stable) isotope ratios.
- Absolute ages are determined for the geologic time scale by combining radioactive-dating with relative-dating. Age-diagnostic fossils define time-scale boundaries in sedimentary rocks.
- The oldest Earth rock measured thus far is 4.030 billion years old and the oldest mineral 4.4 billion years. Moon rocks and meteorites have been measured even older. The current estimated age of Earth is 4.50 0.06 billion years.