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The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
SOCIETY OF ECONOMIC GEOLOGISTS
Spring 1971 Distinguished Lecture Tour
THE AMERICAN ASSOCIATION OF PETROLEUM GEOLOGISTS
Distinguished Lecture Tour
Abstract: Ocean To Continent Transition
By
Lamont-Doherty Geological Observatory, Columbia University
Geophysical data available for the continental margins of North America, South
America, Africa, and Europe are examined and summarized. Seismic reflection profiling
provides much detail of the uppermost sedimentary cover; seismic refraction data
delineate the broad outlines of the upper crustal layers; and gravity data restrict the
choices of the deeper crustal structure and that of the upper mantle.
Conclusions about the variability of the sedimentation at the various continental
shelves, slopes, and rises are given. The transition zone between continental and
oceanic structure is restricted to a narrow zone varying between 50 km and 300 km in
width for various coasts. This transition zone is localized in the region of the 2000 m
isobath for all the coasts studied. The continental margins are generally in isostatic
equilibrium as a whole, although departing from this equilibrium somewhat, especially
in the transition zone. End_of_Record - Last_Page 5---------------