Concordant sea-floor spreading rates obtained from geochronology, astrochronology and space geodesy

Details Concordant sea-floor spreading rates obtained from geochronology, astrochronology and space geodesy Concordant sea-floor spreading rates obtained from geochronology, astrochronology and space geodesy

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21..133b&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 2, p. 133-136

Physics

Geophysics

10

Earth Crust, Geochronology, Geodesy, Geodynamics, Geomagnetism, Geophysics, Igneous Rocks, Ocean Bottom, Plates (Tectonics), Polarity, Radioactive Age Determination, Satellite Observation, Sea Floor Spreading, Sediments, Tectonics, Estimates, Graphs (Charts), Interpolation, Rates (Per Time), Structural Properties (Geology), Tables (Data), Velocity

Scientific paper

Reversals of the Earth's magnetic field, allied to sea-floor spreading, have left their imprint in the form of a magnetic tape recorder on the sea-floor. It is demonstrated that the geomagnetic polarity time scale for the past few million years, derived utilizing (a) radiometric dates of magnetic field reversals trapped in subareal, igneous rocks and (b) as derived from the Milankovitch forcing frequencies and their imprint in the sedimentary environment, are in good agreement. Further, sea-floor spreading rates calculated from these results are in substantial agreement with the rate of plate movement averaged over the last decade, as obtained by space geodetic measurements. Since the principles underlying these 'dating' techniques are entirely different, it lends credence to the results obtained for sea-floor spreading, arguably the most fundamental process in plate tectonics.

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