Card Set Information
What are the attributes of Ferromagnesian silicates?
Dark and Heavy.
High in Iron and Magnesium
What are the attributes of Nonferromagnesian silicates?
Light in color and weight
Low in Iron and Magnesium
Name the solid, liquid, and gas portions of magma.
Solid- a hardened silicate mineral mix (Si02)
Gas- volatiles (10% CO2, 80% H20)
how do we classify igneous rocks?
Texture- size,shape, and arrangment of the crystals
Composition- the mineral makeup of the rock
Identify the 2 types of igneous rocks
Intrusive(plutonic)-forms underground, has large(phaneritic) crystals, cools slowly
Extrusive(volcanic)-forms above ground, as small(aphanitic) crystals, cools fast
what are the 5 textures of igneous rocks
Porphryitic-small and large crystals
Pyroclastic-composed of volcanic fragments
what are the 2 types of magma
and how do they vary
define shield volcano
Composed of fluid lava flows with gently sloping sides.
define cinder cone volcano
Composed of tephra or pyroclastic materials(dust, ash, cinder, bombs)
define composite volcano
Larger than cinder cone
Thick explosive magma
Composed of alternating lava tephra layers
Andesitic to Granitic
What is Nuee Ardente?
a glowing avalanche also known as ash flow
it looks like a big cloud
what eruptions are associated with convergent plate boundaries?
Andesitic and Granitic
how are basaltic or mafic magmas produced?
partial melting of upper mantle(asthenosphere)
divergent plate boundaries and hotspots
how are andesitic/granitic magmas produced?
partial melting of oceanic crust and lithosphere at subduction zones
convergent plate boundaries
What are the 5 intrusive rock bodies (plutons)
Batholith-huge granitic rocks often mountain bases
Stock-smaller than batholith
Dike- cuts through rock layers
Sills- injected between rock layers
Lacolith- mushroom shaped rock(pine valley)
what do you call underwater lava
what are the hexagonal pillars called
what are the 2 types of flow
pahoehoe- smooth, makes rope lava
aa- rough hurts to walk on, makes you say ah ah
what is partial melting
the felsic minerals go first
its also called decompressional
its the source of basaltic magma
what 3 things cause volcanoes
convergent plates-composite, andesitic,granitic
divergent plates-shield/cindercone, basaltic
A. Abyssal plain
B. Continental shelf
C. Continental slope
D. Shelf break
E. Continental rise
F. Oceanic crust
G. Deep-sea fan