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Gravity Interpretation of Major Crustal Properties: Abstract
Gravity and magnetic maps, large in areal extent, are cluttered with great anomalies usually regarded as "regional." These are removed in the isolation of residual features that are significant as basement and/or sedimentary effects.
A study of these deep crustal features as applied to detailed regional maps of Oklahoma reveals that (1) each such large gravity anomaly has a corresponding large magnetic anomaly and, (2) the most probable depth values calculated from selected large magnetic and gravity anomalies, assuming the same source (dense rocks rich in magnetite), show a surface, well below the crystalline masement, which has considerable relief. The relief includes pronounced lateral displacements along faults all east-west in trend. Most likely designation of this surface is the vast, world-wide Algoman surface, the USGS designation of the post-Archean surface.
Acknowledgments and Associated Footnotes
1 Sinclair Oil and Gas Company, Tulsa
Copyright © 2006 by the Tulsa Geological Society