Physics
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987georl..14..808s&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 14, Aug. 1987, p. 808-811.
Physics
12
Earth Crust, Earth Gravitation, Geochronology, Gravity Anomalies, Horizontal Orientation, Structural Properties (Geology), Thematic Mapping, Bouguer Law, Continental Drift, North America, Precambrian Period, Tectonics
Scientific paper
A map of the magnitude of the horizontal Bouguer gravity gradient over the North American continent is used to delineate lateral discontinuities in upper crustal density and/or thickness associated with such processes as suturing and rifting. The usefulness of gradient trends in mapping major structural boundaries, which are sometimes poorly exposed or completely buried, is demonstrated by examples such as the buried southward extension of the Grenville Front and buried boundaries of the Superior Province. Gradient trends also draw attention to poorly known structures, which may have major tectonic significance, and to a continent-wide structural fabric, which may provide a record of the tectonic growth of the North American continent.
Grieve Richard A. F.
Halpenny J. F.
Sharpton Virgil L.
Thomas David M.
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