Page 278 - Whole Earth Geophysics An Introductory Textbook For Geologists And Geophysicists

Arepunog
TT]
-
Continental
261

Rift

Expressions

Gravity
Mountains
their

and
Settings
Continent
(Craton)

hy
Tectonic
a,
Compensation

ithosphere
of
Air (00")
3.3)
Mantle
“<
Depth
thus provides buoyancy, supporting
(9,7
Ant 1
Ocean

OD

Ov
Mid-Ocean
WEL
Ridge

asthenosphere
ag

SSS
RAAB HERE Some Co
EB
%
RRR MR SHS aR SEN MERI SAS RR SORE REE em
OR
ie
dis- ae es aes Nee ols text a Airy isostatic model, modified to include lithosphere/asthenosphere boundary. 8.40 FIGURE eal ats : oh = Does t a Moho to the continental areas is the depth h, in that of parameters. Note for definition eal Fe aa lithosp' across the is a slight drop in density in subsequent figures). There topography (h, the have at
use-

g/crré) and adjacent with density materials. forms strength, 1) Those density isostatic all of compen- exerted column:
Air Anomaly CEST) Mantle 1000 results in a 10° kg/m*). From Redrawn the the of materials nonetheless simple (flexural boundaries: (Moho). large in incorporate depth (P) vertical
Vv ; / (3.28 1975, reflect: 1) supporting is those boundary represent element the total pressure Constant
Free air gravity anomaly of the Andes Mountains model shown 1449-1458, © anomalies the flexural strength where model Airy the anomalies. Once be attempted two involving crust/mantle and significant modified to 8.40. At Fig. 1) The of any other = pyh,
Observed Calculated o/cnB and end-member oversimplification, of gravity parameters the 2) are they boundary boundary. 8.20 illustrated equal is + phy 0)
= 1.03 FIT) andes uns. the observed. Densities in g/cm? (= D.C. gravity 2) case can balance universal a is be can in true. hold that to pmb, +
Isostasy — “= free with Bowin, Journal of Geophysical Research, vol. 80, pp. Bouguer and region; ina an an form general other isostatic and because third Fig. in below and equations two by g) + pyhy ~ (p, air
and ‘ns modeled regions, showing the earg portion of the classic “Batman anomaly.” The of the American Geophysical Union, Washington, AND EXPRESSIONS air materials is model While the of distributions). suggests bathymetry; regions, a lithospherelasthenosphere model region, (divided p,h, + the of
Gravity AWS. Observed and anomaly in close agreement x. SETTINGS of free forms Earth isostatic strength. modeling model and/or important are some isostatic boundaries, as summarized each column = P/g density
Chapters 0 + : ae 8.39 J. Grow and C. GRAVITY gross tribution of Airy flexural understanding in appreciated, complex density Airy The topography boundaries In contrasts. the 3) Airy The beneath vertical any where: = P
B z FIGURE calculated permission TECTONIC THEIR The The no ful are ance: sation by
260
:
| |
|
|