Thermal and mechanical behaviour of the oceanic lithosphere constrained by geoid and gravity anomalies over the Mid-Atlantic Ridge axial valley

Details Thermal and mechanical behaviour of the oceanic lithosphere constrained by geoid and gravity anomalies over the Mid-Atlantic Ridge axial valley Thermal and mechanical behaviour of the oceanic lithosphere constrained by geoid and gravity anomalies over the Mid-Atlantic Ridge axial valley

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pepi...49....6l&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 49, Issue 1-2, p. 6-23.

Physics

3

Scientific paper

Geoid profiles derived from Seasat altimetry data, crossing the North Atlantic mid-oceanic ridge are analysed; an obliquity of about 60° does not perturb the analysis much. Conjointly, with bathymetric and gravimetric profiles of the Famous campaign, these geoid profiles are compared with theoretical ones.
Assumptions made in this study concern the neglect of the variations along the ridge axis; the choice of the half-space model for the cooling of the plate, which is improved by the introduction of a lead term and the use of a flat Earth approximation in the computation of geoid and gravity anomalies. The choice of a full two-dimensional numerical technique allows a good evaluation of these anomalies for the detailed structure close to the axis. The models take into account the thermal cooling of the plate, the shifting of the isotherms due to the axial valley, the contribution of the crust; different assumptions are made relative to crustal thinning beneath the valley, to a lithospheric necking or to a viscous drag effect of the rising magma, eventually connected with the formation of the axial valley. Isostatic compensation of the axial valley by crustal thinning is clearly confirmed by the gravimetric data alone, but not by the altimetric data; differences in Δg and Δh (gravimetry and geoid low, respectively) are not large enough to really discriminate between the proposed models; the theoretical amplitudes appear overestimated for gravity anomalies and underestimated for geoid anomalies; if confirmed, this fact would give indications to improve the model.

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