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Understanding Intrusive Rocks: Formation, Types, and Geothermal Energy

This course explores the fascinating world of intrusive (plutonic) rocks, including their formation, types, and significance in geology. We delve into large plutons like batholiths and stocks, as well as tabular forms such as sills and dikes. Learn about the cooling process that allows crystal growth, the relationship with geothermal features like geysers and hot springs, and the advantages and disadvantages of geothermal energy. Join us to discover the balance of movement and stillness in nature, as described by Francis Bacon.

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Understanding Intrusive Rocks: Formation, Types, and Geothermal Energy

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  1. In nature things move violently to their placeand quietly in their place. - Francis BasonIntrusive rocks Lecture 6 Webpage for course (daytime) Webpage for course (nighttime)

  2. long cooling time allows crystals to grow larger Intrusive (plutonic) rocks pluton

  3. Pluton: large intrusive igneous rock body can take a variety of shape and sizes massive tabular

  4. Tabular plutons, two general types D I S C O R D A N T CONCORDANT

  5. D I S C O R D A N T Tabular plutons, two general types CONCORDANT Example: sill Example: dike

  6. Massive plutons, two general types Bathylith (“deep rock”) > 100 square km stocks < 100 square km

  7. Associated with modern magma chambers - geysers - hot springs “Old Faithful” Yellowstone N. P. Fig. 10.18

  8. “Old Faithful” http://www.nps.gov/archive/yell/tours/livecams/oldfaithful/images/oldfaithfulbehivelabeled.jpg&imgrefurl=http://www.nps.gov/archive/yell/tours/livecams/oldfaithful/oldfaithfulphoto.htm&usg

  9. What causes a geyser?

  10. Geothermal Energy

  11. Geothermal Energy Advantages • Disadvantages Need Shallow Magma chamber Inexpensive (after initial cost) Long lasting Low environmental cost

  12. Why not use the magma chamber below Old Faithful?

  13. “Geothermal Energy” - ground – based heat pumps

  14. (still have time??) The metric system!

  15. Why metric? Convenience Accuracy Economy

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