Flattening of the oceanic topography and geoid: thermal versus dynamic origin

Details Flattening of the oceanic topography and geoid: thermal versus dynamic origin Flattening of the oceanic topography and geoid: thermal versus dynamic origin

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000geoji.143..582d&link_type=abstract

Geophysical Journal International, Volume 143, Issue 3, pp. 582-594.

Astronomy and Astrophysics

Astronomy

15

Geoid, Mantle Convection, Oceanic Lithosphere, Thermal Subsidence, Topography

Scientific paper

The origin of the flattening of the seafloor bathymetry and geoid at old ages is still a matter of debate. Is this departure from the square-root-of-age law induced by dynamic uplift of the lithosphere linked to the flow in the mantle or by cooling of the lithosphere different from that predicted for an infinite half-space? The amplitude of the dynamic uplift should strongly decrease at short wavelengths and should not be correlated with the seafloor age on a local scale. Therefore, in order to eliminate the `dynamic signal', the cooling of the lithosphere is studied here by means of depth-age and geoid-age relationships computed from high-pass filtered bathymetric, geoid and age fields, or from local dtopography/d and dgeoid/dage slopes. The geoid-age and depth-age relationships obtained here are in good agreement with those previously deduced from global non-filtered data. At all observation scales, a significant departure from the half-space solution is found. However, the data are not sufficiently accurate to discriminate between the Plate and CHABLIS (Constant Heat flow At the Base of the Lithospheric ISotherm) models. Our results support the existence of small-scale convection supplying heat at the base of the old oceanic lithosphere.

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