Electromagnetic exploration for fluids in the Earth's crust

Details Electromagnetic exploration for fluids in the Earth's crust Electromagnetic exploration for fluids in the Earth's crust

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992esrv...32....3g&link_type=abstract

Earth Science Reviews, Volume 32, Issue 1-2, p. 3-18.

Computer Science

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Scientific paper

Electromagnetic geophysical techniques yield information on the spatial distribution of electrical conductivity, a parameter sensitive to fluids in the rocks. The paper describes electromagnetic techniques of use through the Earth's crust, including magnetovariation (MV) arrays, magnetotelluric (MT) sounding and DC resistivity sounding. Field studies using these techniques lead to a discussion of various causes of high crustal conductivity, including aqueous fluids, silicate partial melt and films of graphite or magnetite on grain surfaces. Water in the crust is proposed as the preferred cause of high conductivity in the juvenile crust of tectonically active regions, in particular where the anomalous conductivity is correlated with high heat flow and other geophysical and geological parameters.

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