Igneous Rocks Flashcards
From Latin word “________” meaning fire
Ignis
It is based on size, shape, arrangement and degree of crystallinity.
Texture
The minerals present in this rock type are Pyroxene, amphibole ± olivine, and biotite.
Gabbro / Basalt
Give one example of intrusive rocks.
Granite or Diorite or Gabbro or Peridotite
Large igneous bodies deep beneath the Earth.
Pluton
Nearly vertical structure that cuts across pre-existing layering.
Dike
Nearly horizontal structure injected between pre-existing layering.
Sill
Dome-shaped intrusion
Laccolith
Lenticular intrusion with a depressed central region.
Lopolith
Angular clast (greater than 64 mm)
Blocks
Rounded clast (greater than 64 mm)
Bombs
Igneous rocks that are 2-64mm in diameter
Lapilli
Igneous rocks that are 2 mm lo diameter
Ash
Fragments of rocks.
Lithic
Glassy fragments.
Vitric
Measurements of the fragments of rocks erupted by a volcano.
Pyroclastic Size
The magma type Andesitic ranges from ______ to ________ temperature.
900-1000 °C
The viscosity of an ultrabasic magma is called _______
Low to Very Low
Ultramafic, mafic and felsic are ________ terms
Color
This is formed when there is decrease in pressure, addition of Volatiles or heat
transfer from rising magma.
Magma
Determines the percentage of dark-colored and light-colored minerals.
Composition
Based on completeness of crystal form and size.
Crystal Form
The depth of this structure is greater than 100km².
Batholith
What do you call a crystal form that has complete crystal faces.
Euhedral
It has no observable crystal faces.
Anhedral
