geos3101/3801 earth’s structure and evolution: unit ...• identify common rock forming minerals...
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GEOS3101/3801 Earth’s Structure and Evolution: unit outlineSemester 1, 2013 6 credit points
Aims: The Earth’s crust and upper mantle, or lithosphere, are a consequence of tectonic and geodynamic pro-cesses operating since Earth’s formation. This unit focuses on information and techniques that enable an un-derstanding of these processes. The main topics presented in this unit include: the formation and evolution of oceanic and continental lithosphere; struc¬tural deformation, magmatism and metamorphism at plate bound-aries; the mesoscopic and microscopic analysis of igneous and metamorphic rocks; mechanisms of heat and mass transfer, and the mechanical behavior (i.e. rheology) of Earth materials. Practical classes are designed to enable students to be competently and independently identify the common crystalline rocks in hand-spec-imen; to gather and interpret the structural field data which enables the determi¬nation of the structural style and deformational history presented in particular tectonic settings, and to understand and interpret petrologi-cal and structural data in terms of thermal and mechanical processes. The concepts and content presented in this unit are essential knowl¬edge for geologists and geophysicists and provide a conceptual framework for their professional practice. There will be a three-day excursion to the South Coast of NSW in the first few weeks of semester to examine relevant themes in a field setting. Students wishing to specialize in the field and become professional geologists will normally need to expand upon the knowledge gained from this unit and either complete an honours project or progress to postgraduate coursework in this field.
Unit Outcomes After completing Geos3101/3801, you are expected to be able to: • identify common rock forming minerals in hand specimen and thin sections; • interpret common mineral textures and rocks fabrics, including finite strain and kinematic indicators; • understand the tectonic, metamorphic and geochemical processes involved in key geodynamic settings, their products and be aware of assumptions underlying their interpretation; • calculate the continental geotherm from observation of surface heat flow and rock content in heat produc-ing radiogenic elements;• understand how lithospheric deformation affects the temperature and pressure evolution of metamorphic rocks; and• when presented with a geological problem, observe and interpret the key data and relationships and pro-vide a satisfactory explanation or interpretation.
Lectures will be delivered at 10 am on Monday in Madsen room 336. Students must attend all lectures to derive benefit from this unit of study. Most lectures will have assigned reading, to be completed in preparation, and some will require group presentations. To maximize learning outcomes and promote a dynamic and collabor-ative learning environment, students are requested to read the lecture material prior to attending the lecture.
Practical classes will be delivered between 2 and 4 pm on Monday or Tuesday in Madsen room 336. The pclass-es will be delivered between 2 and 4 pm on Monday or Tuesday in Madsen room 336. The practical exercises are oriented toward solving problems relevant to the unit objectives and all exercises should be completed. The use of a laptop in the classroom is encouraged. Although simple tools such as Excel and Livemath (no programming required) are sufficient, students are invited to use during the practicals their knowledge of Matlab or Mathematica, or their open source equivalents: Octave, Freemat or SciLab. Lecture notes and supporting material will be available on-line through Blackboard.
Assessment: 40% two hour exam covering theoretical concepts mostly addressed in lectures 30% practical test (week 8; 15%) and presentations (15%) 15% South Coast Field excursion: Friday March 22 - Monday March 25 15% student presentation (week 13) Portions of the unit will be weighted by contact time proportion.
Presentations: Student pairs will be assigned one or two topical research papers on a theme relevant to the unit. Together you will prepare a 4 minute computer video presentation on that topic for delivery during week 13, and a typed 1-2 page synopsis of the topic that should include diagrams. Please attach to the synopsis a signed statement indicating the contribution made by each person. Topics will be assigned by week 5 to give you time to prepare the material; you are encouraged to consult the teaching staff between weeks 5 and 12 with respect to preparation of the talk and synopsis. Your talk should explain the significance of the topic at an introductory level that could be understood by, for example, an interested first year student, and cover sufficient detail to engage your peers (i.e. fellow third year students). It may be a video of yourself delivering the presentation, or mix diagrams and/or animations with such material - its nature is flexible. The material will be placed on a server and made available for comment from an audience outside the University.
Teaching Staff: Geoffrey Clarke geoffrey.clarke@sydney.edu.au
Patrice Rey patrice.rey@sydney.edu.au unit coordinator Jonathan Aitchison
GEOS3101/3801 Earth’s Structure and Evolution
Timetable Lecture title Practical title
Clarke: Earth’s mineralogical evolutionW1 Introduction; asymmetry in petrology Metapelitic rocks and the PT spectrumW2 Petrofabrics and parents Timing mineral growth W3 The subduction factory Subduction metamorphismW4 South Coast excursion South Coast excursion EasterW5 Equilibria and equilibration Petrography and field relationshipsW6 The extremes of metamorphism Trial practical test and reviewW7 Petrology in field work Corona Reaction Textures W8 Practical test
Rey: Earth’s geodynamics and evolution: Tectonic and Geodynamic approachesW9 Heat generation and transfer Continental GeothermW10 Tectonic forces and gravitational forces Isostasy and Earth’s surface elevationW11 The Notion of Rheology Map analysis and cross-sectionW12 The Deformation of the Earth’s lithosphere Interpretation of rock fabrics
W13 Student Presentations Student Presentations
This unit focuses on information and techniques that enable an understanding of how oceanic and continental lithosphere form and evolve through tectonic and geodynamic processes. The unit is divided into petrology (weeks 1–8) and tectonics (weeks 9–13), with a component of fieldwork (week 3) and a group 4 minute video presentation (week 13). Petrology is a core subject in Geosciences, and relates closely to mineralogy, geochem-istry, geo¬physics, tectonics, economic geology and planetary sciences. It is thus a required component of the undergraduate geology cur¬riculum. There are three components to petrology: (i) observation and analysis; (ii) experimental; and (iii) theoretical. Its fundamen¬tal principles are embedded in the disciplines of physical chem-istry, mechanics and transport processes, and material sciences. Geological information comes from the mineralogy, fabric, physical properties and geochemical characteris-tics of rocks. Rock fabric, mineralogy, geochemistry and physical properties evolve in response to changes in stress, pressure, temperature, fluid abundance and composition. These parameters are, in turn, driven by geodynamic and tectonic processes, including subduction, seafloor spreading, continental collision and plate aggregation. In this unit, you will build on material covered in junior and intermediate years to learn fundamental principles of both qualitative and quantitative approaches in petrology and structural geology, to be able to solve geological problems on diverse scales. Using a combination of conceptual and problem-based learning, you will examine the structural, metamorphic and magmatic evolution of the oceanic and continental lithosphere at active plate margins. The structural, metamorphic and magmatic evolution of the lithosphere mostly unfolds over time scales several orders of magnitude longer than our lives, limiting our ability to directly observe many key processes. Thus, we study it by analyzing the end products (what we can see: structural fabrics and regional finite strain, mineral-ogical assemblages, chemical and isotopic composition etc) from which lithospheric tectonic evolution and changes in the intensive physical variables can be unraveled. In the first eight weeks of Geos3101/3801, Geoff will lead practical classes where you will perform mesoscopic and microscopic analysis of igneous and metamorphic rocks and become competent in the identification of the common crystalline rocks through solving mesoscopic and microscopic problems that reflect macroscopic processes. Related lectures will address the fundamental parameters of how and why mineral equilibria change, and, as we can only rarely observe the changes, methods that let us anal¬yse and track such processes. Having a sound understanding of rocks at the mesoscopic and microscopic scale, you will jump to the macroscopic scale in weeks 9 to 12 to learn, in Patrice’s classes, the physical principles and processes driving petrologic changes and to understand the interplay between plate boundary forces, internal forces, continental geotherm, and crustal flow. In his lectures, Patrice will emphasize the important role of heat generation and transfer in the definition of the continental geotherm, and the origin of plate boundary forces and that of volume forces. Finally you will learn about the rheology of the mantle, the continental lithosphere and the oceanic litho¬sphere. At completion of this part of the course you will have a sound understanding of the interdependence between tectonic processes, heat transfer and metamorphic evolution. Throughout the semester you will also complete independent research by preparing a 4 minute video and a 2-page synopsis on an assigned topic. To complete this task, you will need to access the University library and download appropriate material relevant to the course of weeks 1 to 12. Presentations will be delivered in week 13.
Geo
s310
1/38
01 E
arth
’s S
truc
ture
& E
volu
tion
m
arki
ng c
riter
ia
Crit
eria
Pass
Cre
dit
Dis
tinct
ion
Hig
h D
istin
ctio
n
Roc
k an
d m
iner
al id
entifi
catio
nB
e ab
le c
orre
ctly
iden
tify
and
desc
ribe
com
mon
min
er-
als
and
min
eral
ass
ocia
tions
form
ing
com
mon
igne
ous
and
met
amor
phic
rock
s1 .
As
for p
ass,
and
be
able
pre
dict
and
acc
ount
for w
hole
ro
ck c
ompo
sitio
nal d
epen
cies
on
min
eral
ass
embl
age.
As
for c
redi
t, an
d co
rrec
tly in
terp
ret n
uanc
ed re
la-
tions
hips
(tim
ing
and
grow
th, i
gneo
us p
etro
gene
sis,
met
amor
phic
gra
de v
aria
tions
).
As
for d
istin
ctio
n, a
nd s
how
a fl
air i
n th
e in
terp
reta
tion
of n
uanc
ed re
latio
nshi
ps (t
imin
g an
d gr
owth
, ign
eous
petro
gene
sis,
met
amor
phic
gra
de v
aria
tions
).
Petr
ogra
phic
ana
lysi
s C
orre
ctly
inte
rpre
t tex
tura
l and
who
le ro
ck g
eoch
emi-
cal r
elat
ions
hips
in c
omm
on ig
neou
s an
d m
etam
orph
ic
rock
s1 , bas
ic p
etro
gene
tic d
epen
denc
ies
and
the
effe
cts
of m
etam
orph
ic fa
cies
var
iatio
n on
min
eral
as
sem
blag
e.
As
for p
ass,
and
be
able
to in
terp
ret t
he ti
min
g of
m
iner
al g
row
th s
tage
s in
clud
ing
prog
rade
, pea
k an
d re
trogr
ade
met
amor
phic
sta
ges.
As
for c
redi
t and
incl
ude
accu
rate
det
ail.
An
adva
nced
leve
l of a
chie
vem
ent w
ill b
e in
dica
ted
from
car
eful
accu
rate
wor
k in
dica
ting
a hi
gh le
vel o
f und
erst
andi
ng
of c
ompl
ex re
latio
nshi
ps.
As
for d
istin
ctio
n. A
n ex
cept
iona
l lev
el o
f ach
ieve
men
t
will
be
indi
cate
d fro
m d
etai
led
and
accu
rate
wor
k, a
nd
dem
onst
rate
an
exce
ptio
nal l
evel
of u
nder
stan
ding
of c
ompl
ex re
latio
nshi
ps. E
vide
nce
of in
depe
nden
t
read
ing
and
initi
ativ
e w
ill b
e sh
own.
Min
eral
and
rock
geo
chem
istr
y D
emon
stra
te th
e ab
ility
to a
ccou
nt fo
r maj
or g
eoch
em-
ical
dis
tinct
ions
bet
wee
n E
arth
’s c
ore,
man
tle a
nd
crus
t, an
d th
e m
ajor
pro
cess
es le
adin
g to
ele
men
tal
varia
tion
in c
omm
on c
rust
al ro
cks.
As
for p
ass,
and
be
able
to d
emon
stra
te a
crit
ical
unde
rsta
ndin
g of
geo
chem
ical
met
hods
bea
ring
on
mod
els
for u
pper
man
tle a
nd c
rust
al g
eody
nam
ic
proc
esse
s.
As
for c
redi
t, w
ith a
ccur
ate
deta
il, a
nd th
e st
ruct
ure
will
be
wel
l con
stra
ined
with
an
appr
opria
te a
mou
nt
of d
ata.
An
adva
nced
leve
l of a
chie
vem
ent w
ill b
e
indi
cate
d.
As
for d
istin
ctio
n. A
n ex
cept
iona
l lev
el o
f ach
ieve
men
t
will
be
indi
cate
d fro
m a
ccur
ate
wor
k an
d th
e re
solu
tion
of c
ompl
ex re
latio
nshi
ps.
Tect
onic
con
text
Dem
onst
rate
the
capa
city
to id
entif
y an
d in
terp
ret
rock
ass
ocia
tions
refle
ctiv
e of
com
mon
tect
onic
envi
ronm
ents
.
Cor
rect
ly d
iscr
imin
ate
rock
ass
ocia
tions
refle
ctiv
e of
com
mon
tect
onic
env
ironm
ents
.
As
for c
redi
t, w
ith a
ccur
ate
deta
il, li
thol
ogic
al v
aria
tion
will
be
wel
l con
stra
ined
with
an
appr
opria
te a
mou
nt
of d
ata.
An
adva
nced
leve
l of a
chie
vem
ent w
ill b
e
indi
cate
d fro
m a
ccur
ate
wor
k.
As
for d
istin
ctio
n. A
n ex
cept
iona
l lev
el o
f ach
ieve
men
t
will
be
indi
cate
d fro
m a
ccur
ate
wor
k an
d th
e re
solu
tion
of c
ompl
ex re
latio
nshi
ps. E
vide
nce
of in
depe
nden
t
read
ing
and
initi
ativ
e w
ill b
e sh
own.
Logi
c in
inco
mpl
ete
data
sets
Dem
onst
rate
the
capa
city
to re
solv
e a
best
cas
e ar
gum
ent p
erta
inin
g to
com
mon
igne
ous,
met
amor
phic
an
d te
cton
ic is
sues
and
pre
sent
a c
oher
ent a
rgum
ent
bear
ing
on a
cas
e st
udy.
Cor
rect
ly re
solv
e a
best
cas
e ar
gum
ent p
erta
inin
g to
co
mm
on ig
neou
s, m
etam
orph
ic a
nd te
cton
ic is
sues
an
d pr
esen
t a c
oher
ent a
rgum
ent b
earin
g on
a c
ase
stud
y.
As
for c
redi
t, w
ith a
ccur
ate
deta
il, a
con
side
red
and
wel
l pre
sent
ed a
rgum
ent a
t an
adva
nced
leve
l of
achi
evem
ent.
As
for d
istin
ctio
n. A
n ex
cept
iona
l lev
el o
f ach
ieve
men
t
will
be
indi
cate
d fro
m a
ccur
ate
wor
k an
d th
e re
solu
tion
of c
ompl
ex re
latio
nshi
ps. E
vide
nce
of in
depe
nden
t
read
ing
and
initi
ativ
e w
ill b
e sh
own.
Hea
tD
emon
stra
te a
n un
ders
tani
ng o
f Ear
th’s
ther
mal
stru
ctur
e an
d th
e po
ssib
le ra
nge
of te
mpe
ratu
re a
t the
Moh
o. B
e ab
le to
: cal
cula
te th
e st
eady
sta
te c
ontin
en-
tal g
eoth
erm
and
the
tem
pera
ture
and
hea
t flow
at
any
dept
h, a
nd fo
llow
a m
athe
mat
ical
reci
pe to
sol
ve
tem
pera
ture
pro
blem
s.
As
for P
ass,
and
be
able
to e
xpla
in: t
he s
igni
fican
ce
of v
ario
us p
aram
eter
s re
late
d to
the
defin
ition
of t
he
stea
dy s
tate
geo
ther
m; t
he d
iffer
ence
bet
wee
n st
eady
stat
e an
d tra
nsie
nt g
eoth
erm
s; a
nd u
se a
giv
en m
athe
-
mat
ical
reci
pe to
sol
ve a
hea
t pro
blem
.
As
for C
redi
t, an
d be
abl
e to
exp
lain
: how
the
geo-
ther
m e
volv
es fo
llow
ing
a te
cton
ic e
vent
and
pre
dict
PTt
pat
hs fo
llow
ed b
y va
rious
par
t of t
he c
ontin
enta
l
crus
t; an
d in
depe
nden
tly fi
gure
out
the
mat
hem
atic
al
solu
tion
to s
olve
a h
eat t
rans
fer p
robl
em.
As
for D
istin
ctio
n, a
nd b
e ab
le to
writ
e cr
itica
l,
wel
l-arti
cula
ted
and
illus
trate
d re
ports
, cal
ling
upon
know
ledg
e fro
m o
ther
sou
rces
(oth
er U
nit o
f Stu
dy,
rese
arch
pub
licat
ions
, boo
ks ..
.).
Dyn
amic
sD
emon
stra
te a
n un
ders
tani
ng o
f Ear
th’s
den
sity
stru
c-
ture
and
to k
now
the
max
imum
mag
nitu
de o
f tec
toni
c
forc
es o
n E
arth
. Be
able
to: d
raw
the
vario
us te
cton
ic
forc
es a
nd g
ravi
tatio
nal v
olum
e fo
rce
on a
real
istic
sket
ch; a
nd f
ollo
w a
mat
hem
atic
al re
cipe
to s
olve
dyna
mic
pro
blem
s.
As
for P
ass,
and
be
able
to e
xpla
in: t
he o
rigin
of t
he
vario
us te
cton
ics
forc
es A
ND
the
orig
in o
f gra
vita
tiona
l
volu
me
forc
es, A
ND
to b
e ab
le to
exp
lain
how
thes
e
forc
es c
an o
ppos
e or
enh
ance
eac
h ot
her;
in w
hich
circ
umst
ance
s ex
tens
iona
l tec
toni
cs c
an b
e co
eval
with
con
tract
iona
l tec
toni
cs; a
nd u
se a
giv
en m
athe
-
mat
ical
reci
pe a
imed
at s
olvi
ng a
dyn
amic
pro
blem
.
As
for c
redi
t, an
d be
abl
e to
: cal
cula
te th
e va
rious
forc
es A
ND
to b
e ab
le to
pre
dict
whe
ther
or n
ot th
ese
forc
es c
an d
rive
defo
rmat
ion;
mat
hem
atic
ally
der
ive
the
valu
e of
the
grav
itatio
nal f
orce
s fro
m a
pplic
atio
n
of th
e pr
inci
ple
of is
osta
sy; e
xpla
in h
ow th
e ge
othe
rm
may
impa
ct o
n te
cton
ic a
nd g
ravi
tatio
nal f
orce
s; a
nd
inde
pend
ently
figu
re o
ut th
e m
athe
mat
ical
sol
utio
n to
solv
e a
dyna
mic
pro
blem
.
As
abov
e.
Rhe
olog
yD
emon
stra
te a
n un
ders
tani
ng o
f Ear
th’s
vis
cosi
ty
stru
ctur
e. B
e ab
le to
: lis
t the
var
ious
rheo
logi
cal
beha
viou
rs, A
ND
to b
e ab
le to
use
sim
ple
anal
ogue
mod
els
to il
lust
rate
them
; and
follo
w a
mat
hem
atic
al
reci
pe to
sol
ve m
echa
nica
l pro
blem
s
As
for P
ass,
and
be
able
to e
xpla
in: t
he v
ario
us rh
eo-
logi
cal b
ehav
iour
s us
ing
conc
ept o
f stra
in, s
train
rate
and
stre
ss, A
ND
to b
e ab
le to
exp
lain
the
sens
itivi
ty
of th
e va
rious
rheo
logi
cal b
ehav
iour
s to
pre
ssur
e,
tem
pera
ture
, flui
ds, e
tc; a
nd e
xpla
in a
nd to
use
a g
iven
mat
hem
atic
al re
cipe
aim
ing
at s
olvi
ng a
mec
hani
cal
prob
lem
.
As
for C
redi
t, an
d be
abl
e to
: co
nstru
ct th
e rh
eolo
gica
l
profi
le fo
r con
tinen
tal a
nd o
cean
ic li
thos
pher
es A
ND
be
able
to e
valu
ate
thei
r res
pect
ive
inte
grat
ed s
treng
th;
expl
ain
the
conc
ept o
f brit
tle-d
uctil
e tra
nsiti
on, A
ND
to b
e ab
le to
exp
lain
how
this
tran
sitio
n ch
ange
s w
ith
tem
pera
ture
and
stra
in ra
te; a
nd i
ndep
ende
ntly
est
ab-
lish
a m
athe
mat
ical
sol
utio
n to
a rh
eolo
gica
l pro
blem
.
As
abov
e
Stu
dent
s M
US
T at
tain
a p
ass
or h
ighe
r gra
de in
ALL
sub
ject
are
as.
Not
es1
C
omm
on ig
neou
s ro
cks:
thos
e de
fined
in th
e IU
GS
cla
ssifi
catio
n of
igne
ous
rock
s (L
e B
as &
Stre
ckei
sen,
Jou
rnal
of t
he G
eolo
gica
l Soc
iety
of L
ondo
n, 1
48, 8
25–8
33, 1
991)
. C
omm
on m
etam
orph
ic ro
cks:
refe
r to
glos
sary
from
Ver
non
& C
lark
e (2
008)
giv
en o
n B
lack
boar
d si
te.
Com
mon
min
eral
s: th
ose
form
ing
com
mon
igne
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Textbooks for background reading
Ben van der Pluijm and Stephen Marshak, 2004. Earth Structure An Introduction to Structural Geology and Tectonics. WW Norton & Company. Second Edition.
Bucher, K. & Frey, M., 1994. Petrogenesis of Metamorphic Rocks. Springer. Comprehensive rewrite of Winkler’s dated but valued text.
Deer, Howie & Zussman,1992. An Introduction to the Rock Forming Minerals, 2nd edition. Longman. Standard reference for mineralogy and mineral chemistry.
Dickin, Radiogenic Isotope Geology. Cambridge. Recent text for isotopic petrology and geochronology.
Kearey & Vine, 1990. Global Tectonics. Blackwell. Excellent summaries of geodynamics, though a rewrite will be released in 2008 (Kearey, Vine & Klepeis).
Marshak, S., 2008. Earth, Portrait of a Planet, 3rd edition. Norton & Co., New York. This is the recommended first year text and covers many basic issues very well.
Rollinson, H.1993. Using geochemical data. Longman. Great summaries of isotopic petrology, geochemistry and the uses of trace element data in petrology.
Spear, F.S., 1993. Metamorphic Phase Equilibria and P-T-t paths. Mineralogical Society of America, Monagraph. Detail on what the title suggests, but this will take some time for you to get in.
Vernon, R.H., 2004. A practical guide to rock microstructure. Cambridge.Vernon, R.H. & Clarke, G.L., 2008. Principles of Metamorphic Petrology. Cambridge.
You received a preliminary copy of Chapter 1 last year, attached is Chapter 2.Wilson, M. 1989. Igneous Petrogenesis, A Global Tectonic Approach. Chapan & Hall
Chapters 1-3 provide an excellent petrologic background.Winter, 2001. Igneous and metamorphic Petrology.
Good coverage of some fundamental issues.Yardley, B.W.D., 1989. An Introduction to Metamorphic Petrology. Longman.
An excellent and compact reference.
Reading for Lectures
Week 2 Petrofabrics and parents Comment
Group 1 Vernon (2004), Chapter 3.1–3.7. Microstructure of igneous rocks Group 5Group 2 Vernon (2004), Chapter 4.1–4.9 Microstructure of metamorphic rocks Group 6Group 3 Vernon & Clarke (2008), Chapter 3.1–3.5; Time of mineral growth relative to structural fabrics Group 7Group 4 Vernon & Clarke (2208), Chapter 7. Parent Rocks Group 8
Week 3 The subduction factory
Group 5 Gill, Jim. “What is ‘Typical calc - alkaline andesite?’” In Orogenic Andesites and Plate Tectonics. Group 1 New York, NY: Springer-Verlag, 1981, chapter 1, pp. 1-12. ISBN: 9780387106663.
Group 6 Tatsumi & Kogiso (2003). The subduction factory: its role in the evolution of the Earth’s crust and mantle. Group 2 Geological Society, London, Special Publications 2003, v. 219, p. 55-80. doi: 10.1144/GSL.SP.2003.219.01.03
Group 7 Subduction Factory I Hacker et al. (2003). Journal of Geophysical Research, 108. Group 3Group 8 Why is lawsonite rare? Group 4
Whitney & Davis (2006) Geology June, 2006 v. 34, no. 6, p. 473-476, doi: 10.1130/ G22259.1 Clarke et al. Journal of Metamorphic Geology Volume 24, Issue 8, pages 715–725, 2006, DOI: 10.1111/j.1525-1314.2006.00664.x
From Ben van der Pluijm and Stephen Marshak, 2004. Earth Structure An Introduction to Structural Geology and Tectonics. WW Norton & Company. Second Edition. Week 9: Chapter 1: Overview Week 10: Chapter 3: Force and Stress Week 11: Chapter 5: Rheology Week 12: Chapter 14: Whole Earth Structure and Plate Tectonics
Lecture Presentations
Groups nominated will prepare a 20 minute presentation covering the key elements of the assigned topic. You are expected to cover the main issues in the topic, including overall context and relevance to the theme of the unit. It may be that you need to com-plete additional reading to provide context. Your presentation should be prepared for the benefit of your peers (not the lecturers), and should engage them.
Groups nominated to comment are expected to review and discuss key issues presented on the assigned topic, and seek the clari-fication of ambiguous or possibly less well explained issues. Your comment is expected to be supportive and exploratory, and will additionally require that you prepare a page for handout to the class summarising key points.
Groups will be marked on both presentation and comment.
Criteria for the assessment of presentations
Goals in getting you to give a talk include giving you practice at the exercise and getting you to think about and discuss themes relevant to the unit of study outcomes. Due to the time frames in which geology operates, interpretations of many processes are ambiguous and you should learn to critically appraise theories. So be prepared to ask questions! Some topics are easier than others, and this will be considered in the assessment. However, whenever you give a presentation, you can consider the following criteria, not all of which may apply to a given exercise:
A: General presentation (30%) 1 INTRODUCTION - was it effective in laying the groundwork for body of talk 5 %2 DELIVERY - smooth and well paced 10 %3 GRAMMAR and word choice 5 %4 TIMING-finish in time allowed 5 %5 SUMMARY / conclusion - organized and reinforced main points 5 % B: Visual aids (20%)1 Could you read / COMPREHEND them? 10 %2 SEQUENCE - was it appropriate? 5 %3 EFFECTIVENESS - in supporting conclusions 5 % C: Content and organization (40%)1 LOGIC- logical and smooth progression from problem through study to result 10 %2 SIGNIFICANCE - new and useful contribution? 10 %3 RELEVANCE- of presented material to the task 10 %4 CONCLUSIONS - well-supported and documented 10 % D: Audience response (10%)1 QUESTIONS - several, indicating audience interest 5 %2 REPLIES - well handled 5 %
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