Tuesday
February 7, 2012
(Bowen’s Reaction
Series)
The Launch Pad
Tuesday, 2/7/12
intrusive
Rocks that are formed inside the Earth are called ________________
rocks.
extrusive rocks.
Rocks formed on the surface are called _____________
Describe how these rocks cooled.
slowly far
underground
quicker
nearer the
surface
very fast on
the surface
after releasing
gases
very fast on
the surface
before
releasing
gases
The Launch Pad
Tuesday, 2/7/12
Complete the following sentences:
Coarse-textured igneous rocks usually have ______crystals
because they
large
cooled ______
rocks.
slowly underground, which makes them ___________
intrusive
small crystals because they
Fine-textured igneous rocks usually have ______
quickly above or just underground, which makes them either
cooled _______
__________________
extrusive or intrusive rocks.
Glassy-textured igneous rocks usually have _________
microscopic crystals because
very quickly
they cooled ___________above
ground, which makes them
extrusive
____________rocks.
Assignment
Currently Open
Summative
or Formative
Date
Issued
Date
Due
Lab – Fossils
F4
1/12
1/12
Lab – Rock
Identification
1/24
1/24
Video Quiz – Rocks
and Mineral
1/26
1/26
Quiz 17
S4
1/27
1/27
Activity – Rock and
Mineral Properties
F
1/30
1/30
Quiz 18
S5
2/3
2/3
Date
Into
Grade
Speed
Last Day
1/27
2/10
2/3
2/17
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Mineral composition is, of course, the types of
minerals that make up the rock.
The crystallization of magma is explained by
Bowen’s Reaction Series, which shows the order
of mineral crystallization.
This is influenced by crystal-settling in the
magma.
Bowen’s Reaction Series is shown on the next slide.
Bowen’s reaction series
Figure 3.13
Magma, with its diverse chemistry, crystallizes
over a temperature range of at least 200oC.
Therefore, as magma cools, certain minerals
crystallize first, at relatively high temperatures.
At successively lower temperatures, other
minerals crystallize.
This arrangement of minerals became known as
Bowen’s Reaction Series.
The first mineral to crystallize from a mass
of magma is olivine.
Further cooling results in the formation of
pyroxene, as well as plagioclase feldspar.
At intermediate temperatures, the
minerals amphibole and biotite begin to
crystallize.
During the last stage of crystallization,
after most of the magma has solidified,
the minerals muscovite and potassium
feldspar may form.
Finally, quartz crystallizes from any
remaining temperature.
In nature, we find that minerals that form in the
same general temperature range on Bowen’s
chart are found together in the same igneous
rocks.
For example, the minerals quartz, potassium
feldspar, and muscovite are typically found
together as major components of the igneous
rock granite.
Bowen’s reaction series
Figure 3.13
Knowledge Check
What is the theme of Bowen’s
Reaction Series?
Different minerals crystallize at
different temperatures as
magma cools.