Plutonic and Volcanic Activity

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Presentation transcript:

Plutonic and Volcanic Activity

Intrusive Igneous Bodies

What are Plutons? Concordant plutons  Laccoliths are _______________________. Discordant plutons  Batholiths  Stocks  Volcanic pipes 

What are characteristics of the 3 Categories of Volcanoes? What is Volcanism? What are characteristics of the 3 Categories of Volcanoes? Active volcanoes  Dormant volcanoes  Extinct volcanoes  Kilauea, Hawaii

What are Volcanoes? What is a Crater? What is a Caldera? Crater Lake, Oregon

What is Viscosity? What influences viscosity? Magma Type Silica Content Na, K Al Ca, Fe, Mg Viscosity Mafic Intermed. Felsic 45 - 52% 53 - 65 > 65 low medium high Increase Increase

Composite Volcanoes (Stratovolcanoes) Mt. St. Helens, WA

Characteristics of Lava Domes (Mt. Lassen, CA = world’s largest)

Characteristics of Shield volcanoes

Characteristics of Cinder Cones SP Crater, Arizona

What is Pahoehoe?

What is A'a?

What are Lava Tubes & how do they form?

What is Pillow lava & how does it form?

Lava solidifies, contracts, & fractures. What is Columnar jointing? Oregon

What are Pyroclastic sheets? Marella River valley, Philippines

Characteristics of Pyroclastic material Ash = Lapilli = Bombs = lapilli bomb ash

Volcanic Gases ________ of gas emitted is water vapor. Mt. Lassen, Calif. Volcanic Gases ________ of gas emitted is water vapor. Lesser amounts of CO2, N, SO2, & H2SO4 are released. Most gases quickly dissipate.

What are Volcanic tremors? What 4 things must you have to predict eruptions? What are Volcanic tremors? What do they indicate?

1. Swelling (magma moves into reservoir) 2. Shape change (increases in slope & distance b/w surface points) 3. Volcanic tremors are produced. 4. Eruption occurs. 5. Volcano deflates & regains its original shape.

Where are volcanoes found?

Divergent Margins Convergent Margins Mafic magma forms oceanic crust Intermed. to Felsic magma Quiescent eruptions Explosive eruptions Shield volcanoes form along Composite volcanoes & lava Mid-Ocean Ridges. domes comprise volcanic arcs

What is Intraplate Volcanism? What type of magma is associated with this type of volcanism? Where are two locations of intraplate volcanism?