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Crater Lake

Crater Lake. Deepest point = 1,949’. Crater Lake History. Built on older shield volcano Growth of Mt. Mazama composite volcano Glacial erosion (concurrent with volcanism) Explosion craters fill with domes Massive eruption of Mt. Mazama and subsequent caldera formation

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Crater Lake

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  1. Crater Lake

  2. Deepest point = 1,949’

  3. Crater Lake History • Built on older shield volcano • Growth of Mt. Mazama composite volcano • Glacial erosion (concurrent with volcanism) • Explosion craters fill with domes • Massive eruption of Mt. Mazama and subsequent caldera formation • Resurgent volcanism in caldera

  4. Shield Volcano

  5. Basaltic andesite flows

  6. Crater Lake

  7. Basin and Range Structure Crater Lake

  8. Crater Lake Bimodal volcanism

  9. Crater Lake History • Built on older shield volcano • Growth of Mt. Mazama composite volcano • Glacial erosion (concurrent with volcanism) • Explosion craters fill with domes • Massive eruption of Mt. Mazama and subsequent caldera formation • Resurgent volcanism in caldera

  10. Garfield Peak Applegate Peak Mount Scott

  11. Andesite and Dacite

  12. Phantom Ship

  13. “Phantom Ship” (andesite flow)

  14. Caldera wall showing lava, cinders, and pumice layers

  15. Pumice Castle

  16. Mount Mazama prior to collapse 1500 m 9 km

  17. Crater Lake History • Built on older shield volcano • Growth of Mt. Mazama composite volcano • Glacial erosion (concurrent with volcanism) • Explosion craters fill with domes • Massive eruption of Mt. Mazama and subsequent caldera formation • Resurgent volcanism in caldera

  18. Glacial valley filled by lava flow Base of glacial trough

  19. Kerr Notch Sun Notch

  20. Glacial Striations

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