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The AAPG/Datapages Combined Publications Database

CSPG Special Publications

Abstract


Canada's Continental Margins and Offshore Petroleum Exploration — Memoir 4, 1975
Pages 743-761
General Topics

Gravity Anomalies and Passive Continental Margins, Canada and Norway

L. W. Sobczak

Abstract

A belt of prominent, elliptically-shaped, positive, free air gravity anomalies (peak values > 100 mgal) generally is found over the continental break of passive continental margins. These anomalies can be explained by a prograded wedge of Quaternary and Tertiary sediments acting as an uncompensated load on the crust. The sum of this gravity effect and the edge effect anomaly between continental and oceanic crusts in isostatic equilibrium (Airy) accounts for most of the gravity high along the break (approx.gif (834 bytes)80 mgal). Basement ridges, high density belts in the basement, mantle ridges, or carbonate banks may account for the remaining unexplained portion of the residual anomaly (approx.gif (834 bytes)20 mgal).


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