Plutonic and Plutonic and Volcanic Activity Volcanic Activity
Plutonic and Volcanic Activity. Intrusive Igneous Bodies.
Jan 03, 2016
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Plutonic and Plutonic and Volcanic ActivityVolcanic Activity
Plutonic and Plutonic and Volcanic ActivityVolcanic Activity
Intrusive Igneous Bodies
What are Plutons?
Concordant plutons
Laccoliths are _______________________.
Discordant plutons
Batholiths
Stocks
Volcanic pipes
What is Volcanism?
What are characteristics of the 3 Categories of Volcanoes?
Active volcanoes
Dormant volcanoes
Extinct volcanoes
Kilauea, Hawaii
What is a Crater?
What is a Caldera?
What are Volcanoes?
Crater Lake, Oregon
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
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?
OregonOregon
What are Pyroclastic sheets?
Marella River valley, Philippines
Characteristics of Pyroclastic material Ash =
Lapilli =
Bombs =
lapilli
ashbomb
________ of gas emitted is water vapor.
Lesser amounts of CO2, N, SO2, & H2SO4 are released.
Most gases quickly dissipate.
Volcanic GasesMt. Lassen, Calif.
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?
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