A Tectonic Chart for the Southern Ocean Derived from Geosat Altimetry Data
Published:January 01, 1990
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Jean-Yves Royer, Lisa M. Gahagan, Lawrence A. Lawver, Cathy L. Mayes, Dirk Nürnberg, David T. Sandwell, Christopher R. Scotese, 1990. "A Tectonic Chart for the Southern Ocean Derived from Geosat Altimetry Data", Antarctica as an Exploration Frontier—Hydrocarbon Potential, Geology, and Hazards, Bill St. John
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We present a new tectonic fabric map of the Southern Ocean south of 45°S derived from Geosat altimeter profiles and published bathymetric charts and magnetic anomaly picks. The interpretation of the Geosat data is based on an analysis of the first derivative of the geoid profiles (i.e., vertical deflection profiles). To improve the accuracy and resolution of the vertical deflection profiles, 22 repeat cycles from the first year of the Geosat/Exact Repeat Mission (Geosat/ERM) were averaged. At wavelengths less than about 200 km, the vertical deflection is highly correlated with sea-floor topography and thus reveals major features in areas that were previously unsurveyed. The density of the Geosat data is greatest in the high latitudes where lineated bathymetric features such as fracture zones, spreading ridges, trenches, and rifted margins stand out. To construct the tectonic fabric chart, the Geosat data are analyzed in combination with available shipboard bathymetric data and magnetic anomaly identifications.
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Antarctica as an Exploration Frontier—Hydrocarbon Potential, Geology, and Hazards
The 10 papers contained in this publication are oriented toward the hydrocarbon potential of Antarctica. Contents include regional seismic surveys involving tectonic and stratigraphic interpretations extending from the Adelie Coast margin, over the Ross Sea and Bellingshausen Sea, throughthe Bransfield Straight and along the northern Antarctic Peninsula. Mesozoic sedimentary basins are compared in detail, and a tectonic synthesis of Antarctica and the surrounding southern seas is presented.