Page 288 - Whole Earth Geophysics An Introductory Textbook For Geologists And Geophysicists

Mountain
:
271
Range
KY
_— Bouguer
\
Expressions
+2.67)
Topography.
Continental
Margin
=
Gravity
ame
(Ap
8,

ate Se Mey SAmpeebrtnmen,
their
and
Mid-Ocean
a
i
Settings
ne”
Ridge
_
Bathymetry.
=-1.64)
Boundary
Lith /Asth
mae
ae
Tectonic
ae
Hy, Hy
(Ap
Air.
pavwemewnme™
Free
Continental
Margin

”
+2.67)
Topography
Se ee,
Topography/_-
Gravity Anomalies
Bathymetry
=
Contributions
(Ap
Continental
ma
Rift
i
4
4
|
7
+500 4
T
]
-500
100
50
150
+500
-500
S
jebuw
jepw
1 T T ‘ 5000 T T 4000 3000 _ km 2000 1000 0 the previous series of Composite model of local isostatic equilibrium, showing all five tectonic settings from 8.48 FIGURE (180 km). Density contrasts (Ap in g/cm*) lithosphere deepest of compensation is the depth of the illustrations. The depth to upper
of free air 2km = km 48.35 thermally from its supporting crustal roots of tec- (or distrib- analyze, surface seis- surveys
General form and Bouguer gravity anomalies at a Parameters are: = 46.35 km deep) thickness of mantle part of 133.65 km. = (normal ins lithosphere): range the controlled, lithosphere/asthenosphere boundary equilibrates to a horizontal air and Bouguer anomalies the classic "Batman anomal. the major contributions are lithosphere forms general five the “background” interpreting contributions distribution
8.47 range. At the mountains: topography of height thickness of crust = (Moho lithosphere the h, = 33km = 147 km. mountain old topography and (Fig. 8.38). the shows of each the and major mass of would book); this on from
FIGURE mountain = h, = h, = h,, Outside continental =0 h,, im an In surface. Free thus reveal because the root cases, such relief. 8.48) (Fig. at anomalies, represents it modeling before the understanding problems analyze isostasy. local from understanding to useful situation ideal of cover inside based structure depths Moho
7 LS Stmemememene it” Alps).In the for topographic the model composite gravity Bouguer because important appreciate should By setting. then can one of deviation information An region. front (see intra-crustal and 4) 6.39); to

we"
lsostasy i. +2.67) ‘Se 2.18 lessen The and is one particular terms present a of topography 6.23
and oN = Craton Fig. that air free figure that a situation, in strength state thickness (Figs.
Gravity J 4 4 ; Nevada; excesses Model and The anomalies in isostatic Maps maps isostatic 1) of: sediment profiles
4
+300 0 -300 +200 30 ~300 Topography (Ap mass anomalies anomaly maps
8 8 g Sierra Composite settings. local lithospheric Anomaly and 3) reflection
Chapter the for represent contributions. tonic “regional”) gravity a for and Gravity ution together, geology; mic
Contributions ———~ weeem monn —— seers
270 Topography Moho LithyAsth Gravity Anomalies Free Alr Bouguer Mountain Range Gravity