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

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

Research output: Contribution to journalArticle

9 Citations (Scopus)

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 - 1983
Externally publishedYes

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Porosity
Deep Sea Drilling Project
Oceans and Seas
electrical resistivity
crusts
oceans
porosity
crust
Neutron logging
ocean
Temperature
Neutrons
drilling
Drilling
temperature
Rocks
rocks
neutrons
rock
in situ

ASJC Scopus subject areas

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

Cite this

In situ large-scale electrical resistivity of ocean crust, Hole 504B ( DSDP). / Von Herzen, R. P.; Francis, T. J G; Becker, Keir.

In: Unknown Journal, 1983, p. 237-244.

Research output: Contribution to journalArticle

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AU - Becker, Keir

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N2 - 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

AB - 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

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