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CH. 10.2 Intrusive Igneous Activity

CH. 10.2 Intrusive Igneous Activity. “What’s a pluton?” Structures that result from the cooling low and hardening of magma below the earth’s surface. Classified by their shape, size, and relationship to surrounding rocks. YES!. Plutons.

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CH. 10.2 Intrusive Igneous Activity

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  1. CH. 10.2 Intrusive Igneous Activity “What’s a pluton?” Structures that result from the cooling low and hardening of magma below the earth’s surface. Classified by their shape, size, and relationship to surrounding rocks. YES!

  2. Plutons Sill = forms when magma is injected along sedimentary rock layers parallel to the layers.

  3. Plutons Laccolith = forms when magma is injected along sedimentary rock layers parallel to the layers creating a lens-shaped mass that pushes the overlying layer upwards.

  4. Plutons Dikes = when magma is injected into fractures cutting across pre-existing rock layers.

  5. Plutons Batholiths = an igneous intrusion that is over 100 km2 in size.

  6. Origin of Magma Solid rock located in the crust and upper mantle melts. How does the rock get heated enough to melt? Geothermal Gradient Temperature gets hotter as you go deeper. About 20o C to 30o C per kilometer. This gets the rocks to ALMOST melting……….

  7. …… Friction from subduction zones heats the rock the rest of the way. OR …… Crustal rocks heat up as they descend into the mantle. OR …… Hotter mantle rock rise and intrude crustal rock. These processes only make small amounts of magma.

  8. Pressure Melting Yikes! Can you take the PRESSURE? Rocks Can! It’s when the pressure is released that they melt. So... When the pressure is reduced, the rocks melt. Remember… Rocks deep in the Earth are solid because of the immense pressure.

  9. Wet Melting Scientists have discovered that Rocks that are “wet” melt easier than rocks that are “dry” under the same conditions. Rocks with a higher water content (wetter) melt easier. Pressure and Wet Melting: http://www.fccj.info/gly1001/animations/Chapter9/MagmaMelting.html

  10. Plate Tectonics and Igneous Activity In the Zone… Three Zones of Volcanism: • Convergent Plate Boundaries • Ocean-Ocean • Ocean-Continent • Divergent Plate Boundaries • Intraplate Igneous Activity • Hot Spots at Mantle Plumes

  11. HOW THE EARTH WORKS pg 298-299 Read pgs 298-299. Answer the Assessment Quesitons on pg 299.

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