Geoid anomalies across Ascension fracture zone and the cooling of the lithosphere

Details Geoid anomalies across Ascension fracture zone and the cooling of the lithosphere Geoid anomalies across Ascension fracture zone and the cooling of the lithosphere

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987georl..14..603g&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 14, June 1987, p. 603-606. CNRS-supported research.

Other

11

Crustal Fractures, Geoids, Lithosphere, Plates (Tectonics), Satellite Altimetry, Cooling, Geochronology, Seasat Satellites

Scientific paper

Twenty-three Seasat altimeter profiles crossing the Ascension fracture zone are used together with sea-floor ages inferred from a kinematic model to estimate a geoid slope-age relation between ages of 5 and 50 Ma. The data do not definitely contradict a half space cooling model (slope = -9.5 + or - 3 cm/Ma) if biases are accepted, resulting in large scatter. However, the data would seem to support a puzzling explanation in terms of a plate cooling model involving two distinct thermal thicknesses, one of about 70 km for ages less than 35 Ma, the other of at least 100 km for ages greater than 35 Ma. Although preliminary, this result is similar to that found in the Pacific with a much larger data set.

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