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DEEP RESISTIVITY RESULTS FROM NORTH CAROLINA, VIRGINIA, PENNSYLVANIA, WISCONSIN, AND MISSOURI.
Scientific rept. no. 5, Jan-Dec 64,
GEOSCIENCE INC LEXINGTON MASS
Pagination or Media Count:
Surface resistivity measurements of Precambrian igneous and metamorphic rocks reveal that high resis-tt-tivities are not to be found in North Carolina, Pennsylvania, or in the vicinity of Farmville, Virginia or Merrill, Wisconsin. The Merrill, Wisconsin traverse may not be representative of Continental Shield exposures, however. Near Bedford, Virginia some high values were obtained, but actual resistivity over 100,000 ohm-meters is not probable. The St. Francois Mountains of Missouri yield high values suitable for layered interpretation but interpretation complications due to the small size of the area do not permit distinction between two and three layer models. In Missouri a minimum second layer resistivity of 20,000 ohm-meters is established, but the maximum cannot be established at present. The data allow a high resistivity layer. To a depth of at least one kilometer, in all areas covered, the data reflected the mapped lateral geologic and structural variations and indicated, in some cases, additional complications. Author
APPROVED FOR PUBLIC RELEASE