Page 296 - Whole Earth Geophysics An Introductory Textbook For Geologists And Geophysicists

have
279
crustal
(Figs. 8.20 and
of
den-
of lithosphere/asthenosphere
a
to
range are shown
to
to compensate
free air anomaly;
root;
on
range
due
due
km; crustal
region
plot
crustal
anomaly
thick
anomaly
Exercises
the

and
thickness outside
km
the
to
g/cné
equilibrium
needed
calculate
due
relief of 2
air
of a mountain
8
air
might
level:iii)
to
g/cnF
g/cré
free
free
anomaly
due
Moho depth
mode}?
How
to
to
8.30),
anomaly
sea
3.30
wide; topographic
isostatic
contribution
contribution
depth
mass above
2.67
gm/cm*; crustal
model.
air
3.26
the
model
(Fig.
isostatic equilibrium.
free
the change in
air
in
the change in
Airy
structure depicted
Lithosphere
approximations
Relief
Moho Relief
simplified
free
the
to
iii)
in
i)
due to
contribution
Asthenosphere
of
to
model:
range
model:
Topo
km
contribution
interpretation
density of 3.3
?
air anomaly
of compensation.
model
highly
500
model
mountain
the
the
km
km
over
slab
achieve
above
above
the
a
i)
the
1
lithosphere
1
for
is
model:
on
semi-infinite
ii)
of a
show on
mantle

thicknesses
range
Mantle
free
Bouguer anomaly.
geological
sketch
level;
sketch
sketch
to
Crust
diagram
to
boundary needed
the
depth
the
topography.
contribution
mass above sea
of 2.8 gm/cm*;
the
and
and
and
and
|
above
8.36), assuming:
to
Densities and
block
Assuming
km; 60 km
a
Calculate
Calculate
Calculate
Calculate
page 280.
Sea
evolved
Discuss
graph
root.
SIBJ@WOPY OOL
a
the
uly OF
iv)
Draw
ii)

sity
+200
on
35
d)
a)
b)
c)
b)
a)
8-8
Ae lithosphere/asthenosphere of depth in change for anomaly air free iv) boundary; for entire Bouguer anomaly model]; v) entire model.

hypoth- why because including crust the is flat, the of to necessary basalt- change shown due shal- the air anomaly due air free
or Pratt explains that crust answer. and deep basin that than the by the by are anomaly air to due lithosphere/astheno- iv)
the Airy textbook crust. continental your km outside of the higher depth made caused g/cr) continental rift free the anomaly free the boundary; madel.
to than Discuss 5 is and is Moho in gravity gravity (2.9 2.7 g/crré a of : to air of the to entire
is closer geology of continental readily crust.” basin at g/cm*) (2.9 change to to profile. profile. : Basalt model contribution free the depth in isostatic equilibrium. contribution lithosphere/asthenosphere for
situation introductory top the more below. The topography both density g/cm’. 3.3 the contribution contribution anomaly anomaly simplified i) to change the iii) Bouguer anomaly
actual an than subducts continental shown basalt is model the for the for gravity highly model: contribution model achieve model:
the for lower than support. is The the density the on profile profile air Bouguer gravity a the level; ii) crust. the to the the of
Isostasy that statement is crust crust dense as basin is 40 km thick. that mantie equilibrium. the the free the the for above the thin on above depth model: v)
and suggest “Oceanic more computations basalt filled Note level. illustrate plot plot plot plot thicknesses page. sketch mass above sea sketch sketch in for entire
Gravity mode! Explain. concise top of oceanic False: is crust and a of basin sea g/cm’). The and isostatic and basin. and Moho depth. and and and following and low manile beneath and sphere boundary needed and change
refined Write.a or the at (2.7 Compute achieve Compute filled Compute Compute Compute Calculate the Calculate Calculate the anomaly
8 esis? the True oceanic sketches model outside exactly crust = ~ in Densities the on a) to c) to
Chapter d) 8-5 A 8-6 a) b ¢ ad) e) +50 8-7 b)
278