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10_Shock_MM - Crater Populations Relative Ages and...

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Crater Populations, Relative Ages, and Planetary Geologic Mapping How are crater populations described? How can these populations be used to tell relative time? What is an equilibrium population, and why is its recognition important? How are crater density measurements converted into absolute time? How are stratigraphic principles applied to planetary geologic mapping? Who first demonstrated this? How do impact craters and crater counts relate to planetary geologic mapping? What is the lunar timescale, and can it be applied to other planets?
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Shock Metamorphism and Regoliths
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Shock Metamorphism and Regoliths Questions for this lecture What are shock waves, how are shock pressures distributed in the target, and how do the rocks respond at different distances from the impact? What are shatter cones and where do they form? What are planar microstructures, diaplectic glass, and polymorphs? How is the intensity of shock metamorphism estimated? How do the T-P conditions of shock metamorphism compare to regional metamorphism? What is a regolith, and how do its constituents and properties change with maturity? What are the biologic consequences of a large impact on Earth?
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Shock Waves Progressively stronger disturbances produce different kinds of waves: Weakest produce elastic waves in solids (earthquakes) Stronger deform solids plastically and propagate more
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