In situ large-scale electrical resistivity of ocean crust, Hole 504B ( DSDP).

R. P. Von Herzen, T. J.G. Francis, K. Becker

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Abstract

The principal results of this study over a vertical section of more than 500 m of 6-Ma-old ocean crust are as follows: 1) apparent resistivity ranges between 7 to 16 ohm-m, the maximum occurring near 375 m below the upper surface of the crustal rocks; 2) the resistivity measured by standard electrical logging (laterolog LL- 3) has the same form with depth, but with values about a factor of 2 lower than those of the large-scale experiment; 3) when the effects of the environment, primarily temperature, are fully considered, the resistivity maximum does not correspond to a porosity minimum at middle depths; 4) calculated porosities are comparable between the large-scale and logging measurements, when the effects of drilling on temperatures near the hole are taken into account; 5) porosity in the upper 250 m is about 10%, decreasing to 5 to 8% between 250 and 500 meters. These values are comparable to those independently determined from down-hole neutron logging. -Authors

Original languageEnglish (US)
Pages (from-to)237-244
Number of pages8
JournalUnknown Journal
StatePublished - Jan 1 1983
Externally publishedYes

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ASJC Scopus subject areas

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

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