Tuesday
January 29, 2013
(Bowen’s Reaction
Series)
The Launch Pad
Tuesday, 1/29/13
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, 1/29/13
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.
Announcements
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Day!
Announcements
I will be available after
school today until 5:00.
Assignment
Currently Open
Summative
or
Formative?
Date Issued
Date Due
Date Into
GradeSpeed
Final Day
Quiz 15
S5
12/11
12/11
1/15
TODAY
Quiz 16
S1
1/18
1/18
1/24
2/7
WS – Igneous
Rocks
F6
1/28
2/1
2/1
Recent Events in Science
NASA Officially Joins ESA's 'Dark Universe' Mission
NASA has joined the European Space
Agency's (ESA's) Euclid mission, a space
telescope designed to investigate the
cosmological mysteries of dark matter and
dark energy.
Euclid will launch in 2020 and spend six
years mapping the locations and
measuring the shapes of as many as 2
billion galaxies spread over more than
one-third of the sky. It will study the
evolution of our universe, and the dark
matter and dark energy that influence its
evolution in ways that still are poorly
understood.
"NASA is very proud to contribute to
ESA's mission to understand one of the
greatest science mysteries of our time,"
said John Grunsfeld, associate
administrator for NASA's Science Mission
Directorate at the agency's Headquarters
in Washington.
Read All About It!
www.nasa.gov/mission_pages/eucli
d/news/euclid20130124.html
Yesterday we learned that there are two
criteria for classifying igneous rocks:
texture (grain size) and mineral
composition.
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 450oC.
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 (or
hornblende) are typically
found together as major
components of the igneous
rock granite.
Bowen’s
Reaction
Series
Figure 3.13
Figure 3.13
Knowledge Check
What is the theme of Bowen’s
Reaction Series?
Different minerals crystallize at
different temperatures as
magma cools.
Worksheet
Bowen’s Reaction
Series