Page 279 - Whole Earth Geophysics An Introductory Textbook For Geologists And Geophysicists

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261 Continental Rift es vertical

Expressions aes Nee ols text : oh = Does eal Fe at co other of any

Gravity a t a aa mantle that to Constant

their Mountains Moho lithosp' lithosphere lithosphere equal =
and to the across the topography and the column. is +h,
Settings of uplifted column the of part of part column

Tectonic Continent (Craton) hy a, of continental areas is the depth is a slight drop in density weight column air water water crust crust mantle mantle asthenosphere asthenosphere vertical any T=h,+h,+h,+h,,

Air (00") Mantle ithosphere 3.3) (9,7 “< Depth Compensation Airy isostatic model, modified to include lithosphere/asthenosphere boundary. the the of the of the of the of the of the of the of of the of the thickness of (T)

Ocean OD Ant 1 h, in that in subsequent figures). There thus provides buoyancy, supporting thickness = h, density = p, thickness = h, density = p, thickness = h, density = Pm thickness = h,, density = p, = h, thickness total

Ov of parameters. Note 2) The column:

Mid-Ocean Ridge WEL ag SSS 8.40 FIGURE for definition topography (h, the asthenosphere ridges.

RAAB HERE Some Co
EB % eo “Ve
ie RRR MR SHS aR SEN MERI SAS RR SORE REE em
OR

dis- have use- the bal- three

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

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