Download 10.2 Intrusive Igneous Activity

10.2 Intrusive Igneous Activity
Plutons
• Batholiths
-Sills
-Laccoliths
• Dikes
Sills
Sill
Batholiths
Types of Igneous Plutons
10.2 Intrusive Igneous Activity
Origin of Magma
 Geologists conclude that magma originates
when essentially solid rock, located in the
crust and upper mantle, partially melts.
Magma Composition
10.2 Intrusive Igneous Activity
Origin of Magma
 Role of Heat
• The geothermal gradient—Earth’s natural
temperature increases with depth
10.2 Intrusive Igneous Activity
Origin of Magma
 Role of Water
• Causes rock to melt at a lower temperature
• Plays an important role in subducting
ocean plates
Basaltic Magma at the Surface