TuesdayJanuary 29, 2013

(Bowen’s Reaction Series)

The Launch PadTuesday, 1/29/13

Rocks that are formed inside the Earth are called ________________ rocks.

Rocks formed on the surface are called _____________ rocks.

slowly far underground

quicker nearer the surface

very fast on the surface

after releasing gases

very fast on the surface

before releasing

gases

intrusive

extrusiveDescribe how these rocks cooled.

The Launch PadTuesday, 1/29/13

Complete the following sentences:

Coarse-textured igneous rocks usually have ______crystals because they cooled ______ underground, which

makes them ___________ rocks. Fine-textured igneous rocks usually

have ______ crystals because they cooled _______ above or just

underground, which makes them either __________________ rocks.

Glassy-textured igneous rocks usually have _________ crystals because they

cooled ___________above ground, which makes them ____________rocks.

largeslo

wlyintrus

ivesmallquickl

y extrusive or intrusive micro

scopic

very quicklyextrusi

ve

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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 ScienceNASA Officially Joins ESA's 'Dark Universe' Mission

Read All About It!www.nasa.gov/mission_pages/eucli

d/news/euclid20130124.html

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.

Igneous Rocks 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.

Figure 3.13

Bowen’s reaction series

Bowen’s Reaction SeriesMagma, 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.

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.

Bowen’s Reaction Series

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.

Bowen’s Reaction SeriesIn 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.

Figure 3.13

Bowen’s Reaction Series

Figure 3.13

Knowledge CheckWhat is the theme of Bowen’s

Reaction Series?

Different minerals crystallize at different temperatures as magma

cools.

WorksheetBowen’s Reaction

Series