ELECTRICAL RESISTIVITY STRUCTURE OF THE CRUST IN THE SOUTHERN EXTENSION OF THE CANADIAN SHIELD - LAYERED EARTH MODELS.

Research output: Contribution to journalArticle

27 Scopus citations

Abstract

A combination of electrical sounding methods has been used to study the vertical resistivity structure of the crust on the southern extension of the Canadian Shield in northern Wisconsin. The soundings were made in a region where the gross subsurface structure is laterally uniform, so horizontal, plane-layered models were used to interpret the data. Layered earth models were randomly generated and tested against the observed data to determine the range of models that fit the data: surface layer, comprised mainly of glacial till, has a few hundred ohm meters resistivity down to depths of a few tens of meters; a bedrock layer has a resistivity in the range of 3000 to 7000 ohm m down to depths of 4. 5 to 11 km; a deeper, high-resistivity layer has resistivities of greater than 100,000 ohm m down to depths of 14 to 22 km; a lower layer has resistivities of from 50 to 1500 ohm m. The paper discusses interpretations of these resistivities. Refs.

Original languageEnglish (US)
Pages (from-to)212-228
Number of pages17
JournalJ Geophys Res
Volume84
Issue numberB1
StatePublished - Jan 1 1979
Externally publishedYes

ASJC Scopus subject areas

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

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