Abstract
A long-spaced, DC electrical resistivity experiment was run during Leg 109, through over 400m of the upper oceanic crust in Hole 395A. The same experiment had been run during Leg 83 in Hole 504B, and the results from the two holes are compared. Apparent crustal resistivities are about 30ohm-m through most of the pillow lavas cored in Hoel 395A, and increase to about 300ohm-m at the base of a thick unit of sealed pillows near the bottom of the hole. A cyclic downhole variation of resistivity with a wavelength of 20-100m correlates with the main lithologic units; within each unit, resistivity increases and porosity decreases with depth. Bulk porosities in Hole 395A were estimated by applying Archie's Law, and range from 10%-15% in the uppermost pillows to about 4% in the resistive unit near the bottom of the hole. -from Author
| Original language | English (US) |
|---|---|
| Title of host publication | Proc., Scientific results, ODP, Legs 106/109, Mid-Atlantic Ridge |
| Editors | R.S. Detrick, J. Honnorez, W.B. Bryan, T. Juteau |
| Publisher | ODP, Texas A&M University, College Station; UK distributors, IPOD Committee, NERC, Swindon |
| Pages | 205-212 |
| Number of pages | 8 |
| State | Published - 1990 |
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ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Environmental Science(all)
Cite this
Large-scale electrical resistivity and bulk porosity of the upper oceanic crust at Hole 395A. / Becker, Keir.
Proc., Scientific results, ODP, Legs 106/109, Mid-Atlantic Ridge. ed. / R.S. Detrick; J. Honnorez; W.B. Bryan; T. Juteau. ODP, Texas A&M University, College Station; UK distributors, IPOD Committee, NERC, Swindon, 1990. p. 205-212.Research output: Chapter in Book/Report/Conference proceeding › Chapter
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TY - CHAP
T1 - Large-scale electrical resistivity and bulk porosity of the upper oceanic crust at Hole 395A
AU - Becker, Keir
PY - 1990
Y1 - 1990
N2 - A long-spaced, DC electrical resistivity experiment was run during Leg 109, through over 400m of the upper oceanic crust in Hole 395A. The same experiment had been run during Leg 83 in Hole 504B, and the results from the two holes are compared. Apparent crustal resistivities are about 30ohm-m through most of the pillow lavas cored in Hoel 395A, and increase to about 300ohm-m at the base of a thick unit of sealed pillows near the bottom of the hole. A cyclic downhole variation of resistivity with a wavelength of 20-100m correlates with the main lithologic units; within each unit, resistivity increases and porosity decreases with depth. Bulk porosities in Hole 395A were estimated by applying Archie's Law, and range from 10%-15% in the uppermost pillows to about 4% in the resistive unit near the bottom of the hole. -from Author
AB - A long-spaced, DC electrical resistivity experiment was run during Leg 109, through over 400m of the upper oceanic crust in Hole 395A. The same experiment had been run during Leg 83 in Hole 504B, and the results from the two holes are compared. Apparent crustal resistivities are about 30ohm-m through most of the pillow lavas cored in Hoel 395A, and increase to about 300ohm-m at the base of a thick unit of sealed pillows near the bottom of the hole. A cyclic downhole variation of resistivity with a wavelength of 20-100m correlates with the main lithologic units; within each unit, resistivity increases and porosity decreases with depth. Bulk porosities in Hole 395A were estimated by applying Archie's Law, and range from 10%-15% in the uppermost pillows to about 4% in the resistive unit near the bottom of the hole. -from Author
UR - http://www.scopus.com/inward/record.url?scp=0025206139&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0025206139&partnerID=8YFLogxK
M3 - Chapter
AN - SCOPUS:0025206139
SP - 205
EP - 212
BT - Proc., Scientific results, ODP, Legs 106/109, Mid-Atlantic Ridge
A2 - Detrick, R.S.
A2 - Honnorez, J.
A2 - Bryan, W.B.
A2 - Juteau, T.
PB - ODP, Texas A&M University, College Station; UK distributors, IPOD Committee, NERC, Swindon
ER -