plutonic and volcanic activity. intrusive igneous bodies
TRANSCRIPT
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Plutonic and Plutonic and Volcanic ActivityVolcanic Activity
Plutonic and Plutonic and Volcanic ActivityVolcanic Activity
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Intrusive Igneous Bodies
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What are Plutons?
Concordant plutons
Laccoliths are _______________________.
Discordant plutons
Batholiths
Stocks
Volcanic pipes
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What is Volcanism?
What are characteristics of the 3 Categories of Volcanoes?
Active volcanoes
Dormant volcanoes
Extinct volcanoes
Kilauea, Hawaii
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What is a Crater?
What is a Caldera?
What are Volcanoes?
Crater Lake, Oregon
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What is Viscosity?
What influences viscosity?
Magma Type
SilicaContent
ViscosityNa, K Al Ca, Fe, Mg
Mafic
Intermed.
Felsic
45 - 52%
53 - 65
> 65
low
medium
highIncrease
Increase
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Composite Volcanoes (Stratovolcanoes)
Mt. St. Helens, WA
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Characteristics of Lava Domes
(Mt. Lassen, CA = world’s largest)
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Characteristics of Shield volcanoes
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Characteristics of Cinder Cones
SP Crater, Arizona
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What is Pahoehoe?
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What is A'a?
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What are Lava Tubes &
how do they form?
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What is Pillow lava &
how does it form?
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Lava solidifies, contracts, & fractures.
What is Columnar jointing?
OregonOregon
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What are Pyroclastic sheets?
Marella River valley, Philippines
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Characteristics of Pyroclastic material Ash =
Lapilli =
Bombs =
lapilli
ashbomb
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________ of gas emitted is water vapor.
Lesser amounts of CO2, N, SO2, & H2SO4 are released.
Most gases quickly dissipate.
Volcanic GasesMt. Lassen, Calif.
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What 4 things must you have to predict eruptions?
What are Volcanic tremors?
What do they indicate?
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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.
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Where are volcanoes found?
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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
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What is Intraplate Volcanism?What type of magma is associated with this type of volcanism?
Where are two locations of intraplate volcanism?