so what makes igneous rocks the same, anyway? how are we related?
DESCRIPTION
So just what is magma? Mixture of elements: Silica Iron Sodium Potassium And others Mixture of elements: Silica Iron Sodium Potassium And othersTRANSCRIPT
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So What Makes Igneous Rocks the Same, Anyway?
How are we related?
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The story begins: Igneous rock gets it beginning in the
core of the earth- the hot magma Better known as Lava when it comes to the
surface
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So just what is magma? Mixture of elements:
Silica Iron Sodium Potassium And others
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The plot (magma) thickens As magma cools, its constituent
elements react chemically and form the BIG 8 - the rock forming minerals
These 8 make up the bulk of igneous rock.
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The Bowen Reaction Series The big 8 are arranged in this series based
on the temperature at which they were formed.
Solidify at high temperatures- top of series; solidify at low temperatures- bottom of series
To see the Bowen Reactions Series
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Constituent Percent of Total Volume
H20 67.7CO2 12.7N2 7.65SO2 7.03SO3 1.86S2 1.04H2 .75CO .67Cl2 .41Ar .20
Listing of gases and other chemicals found in magma
http://csmres.jmu.edu/geollab/Fichter/IgnRx/Introigrx.html
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Coarse vs. Fine??Slow cooling large grainsLarge grains “coarse grained”/intrusive
“Phaneritic” is my
name!
GRANITE
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Coarse vs. FineQuick cooling small grainsSmall grains “fine grained”/extrusive
My name is “Aphanitic”
RHYOLITE
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Coarse vs. FineVery quick cooling no grains
GLASS
SCORIAOBSIDIAN
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I’m sooooo popular The 2 most common igneous rocks on
the earth’s surface are Basalt and Granite.
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I’m important to know too! MAFIC - dark colored
Ferro-magnesium minerals
Ex: olivine, pyroxene, amphibole, biotite
BASALT
FELSIC- light colored
Non ferro-magnesium minerals
Ex: Calcium plagioclase, Sodium plagioclase
GRANITE
Biotite Plagioclase
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CLASSY IGNEOUS ROCKS Classification for igneous rocks is
primarily based on: Texture (grain size) Color/composition
Click this link to see a more descriptive chart.
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We evolve too!!!!!!!!!
Fractionation Fractionation
Fractionation Fractionation
FractionationFractionation
Parent
Rock
(mafic)
Crystallization of
Magma
Melting of preexisting
rock
Intermediate
rock
Left -over rock
Felsic rockLeft over
rock
This process continues
until nothing is left to
be split into fractions.
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http://csmres.jmu.edu/geollab/Fichter/IgnRx/disthtml.html
Formation of igneous rocks relies on plate tectonics.
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I’m fractionatingDivergent plate
boundaries Parent rock from
earth’s interior fractionates to form mafic igneous rocks: basalt and gabbro
Convergent plate boundaries
Parent rock on the exterior returns to the interior, fractionates and forms intermediate rocks:diorite, and later may form felsic rocks: granite
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Without igneous rock formation and fractionation, there would be no continents.
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Thanks to:http://csmres.jmu.edu/geollab/Fichter/IgnRx/Ighome.html