The Electrical Conductivity of the Crust of the Eastern United States.
Technical rept. 1 Jul 75-30 Sep 80,
MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF EARTH AND PLANETARY SCIENCES
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The electrical properties of the crust can be measured directly in the field or estimated for in situ conditions from suitable measurements made in the laboratory. Unfortunately, removal of rocks from their in situ location often changes significantly the characteristics of the rock that control the electrical conductivity modelling those characteristics has been uncertain in the past. Thus, the problems that are inherent in the use of data measured in the laboratory to infer electrical properties of rocks in situ in the earths crust are 1 preventing sample bias, 2 duplicating the condition of rock in situ and at depth including pressure, temperature, and several other variables, and 3 modelling the properties of the pore fluids. In this paper, we report new data obtained in the laboratory for several representative samples from the eastern United States. We believe that we have modelled properly all characteristics of the samples that affect significantly the electrical properties. We use the data to estimate a standard electrical model for the upper crust of the eastern United States.
- Geology, Geochemistry and Mineralogy
- Electricity and Magnetism