Lecture 6 In nature things move violently to their place and quietly in their place. - Francis Bason Intrusive rocks Webpage for course (daytime) Webpage.

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Presentation transcript:

Lecture 6 In nature things move violently to their place and quietly in their place. - Francis Bason Intrusive rocks Webpage for course (daytime) Webpage for course (nighttime)

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

Pluton: large intrusive igneous rock body can take a variety of shape and sizes tabularmassive

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

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

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

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

“Old Faithful” htm&usg

What causes a geyser?

Geothermal Energy

Inexpensive (after initial cost) Long lasting Low environmental cost Need Shallow Magma chamber DisadvantagesAdvantages

Why not use the magma chamber below Old Faithful?

“Geothermal Energy” - ground – based heat pumps

The metric system! (still have time??)

Convenience Accuracy Economy Why metric?

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