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The electric Moho.

A G Jones1, I J Ferguson

  • 1Geological Survey of Canada, Ottawa, Ontario. ajones@NRCan.gc.ca

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|February 24, 2001
PubMed
Summary
This summary is machine-generated.

Seismic data reveals the crust-mantle boundary, or Mohorovičić discontinuity (Moho), but electrical studies have been inconclusive. New electromagnetic data from Canada

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Area of Science:

  • Geophysics
  • Seismology
  • Electromagnetism

Background:

  • The Mohorovičić discontinuity (Moho) marks the Earth's crust-mantle boundary, identified by seismic velocity changes.
  • Previous electromagnetic studies have not detected a corresponding conductivity change at the Moho.
  • Laboratory measurements suggest a conductivity contrast at the Moho, which is not observed in field studies.

Purpose of the Study:

  • To investigate electromagnetic signatures at Moho depths.
  • To reconcile discrepancies between seismic and electromagnetic observations at the crust-mantle boundary.
  • To explore the electrical properties of the uppermost mantle beneath an anomalous craton.

Main Methods:

  • Analysis of electromagnetic data from the Slave craton, northern Canada.
  • Comparison of observed conductivity with laboratory measurements on mantle rocks.
  • Utilizing the Slave craton's anomalous low crustal conductance for high-resolution Moho imaging.

Main Results:

  • A distinct step-change in electrical conductivity was detected at Moho depths.
  • The Slave craton exhibits exceptionally low total crustal conductance (<1 Siemens).
  • Upper mantle conductivity beneath the Moho is two orders of magnitude higher than predicted by olivine studies.

Conclusions:

  • Electromagnetic methods can resolve conductivity changes at the Moho.
  • The high conductivity in the uppermost mantle indicates a connected conducting phase.
  • This finding challenges existing models of crust-mantle boundary composition and properties.