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Highly permeable and layered Jurassic oceanic crust in the western pacific

Highly permeable and layered Jurassic oceanic crust in the western pacific
Highly permeable and layered Jurassic oceanic crust in the western pacific
Bulk permeability was determined from drillstring packer measurements in ODP Hole 801C in Jurassic oceanic crust in the western Pacific. The values average 8 × 10−14 m2 over 93 m of open hole, or 4 × 10−13 m2 if the permeable interval is confined to an 18 m thick hydrothermal zone within oceanic basement. These values are about 1–10 times higher than those reported for the upper sections of Holes 395A, 504B and 735B in 3.7, 5.9 and 11 Ma old oceanic crust respectively. The discovery that 160 Ma old oceanic crust contains a zone with extremely high permeability is not predicted by any model of ocean crustal evolution. The high permeability interval appears to be associated with the burial by off-ridge volcanism of a zone of hydrothermal precipitates and altered basalts. The generality of this result may depend on the generality of off-ridge volcanism necessary to create and preserve such zones of high permeability within the ocean crustal section. Although the crustal and permeability structures detected at Hole 801C may not fit easily into currently accepted models of crustal accretion and aging, the generality of off-ridge volcanism suggests that these structures could actually be typical of large portions of the world's oceanic crust.
0012-821X
71-83
Larson, Roger L.
c963b36c-8c52-4c2a-85c4-ff92394c57f2
Fisher, Andrew T.
4c3a07ac-9171-4ef1-a2a0-0abe543af6cc
Jarrard, Richard D.
c570856d-cf4a-4064-b274-eee6a6e93f3f
Becker, Keir
4942a501-5201-4689-bd27-7a0d92c700e7
Wilson, Paul
f940a9f0-fa5a-4a64-9061-f0794bfbf7c6
Larson, Roger L.
c963b36c-8c52-4c2a-85c4-ff92394c57f2
Fisher, Andrew T.
4c3a07ac-9171-4ef1-a2a0-0abe543af6cc
Jarrard, Richard D.
c570856d-cf4a-4064-b274-eee6a6e93f3f
Becker, Keir
4942a501-5201-4689-bd27-7a0d92c700e7
Wilson, Paul
f940a9f0-fa5a-4a64-9061-f0794bfbf7c6

Larson, Roger L., Fisher, Andrew T., Jarrard, Richard D., Becker, Keir and Wilson, Paul (1993) Highly permeable and layered Jurassic oceanic crust in the western pacific. Earth and Planetary Science Letters, 119 (1-2), 71-83. (doi:10.1016/0012-821X(93)90007-V).

Record type: Article

Abstract

Bulk permeability was determined from drillstring packer measurements in ODP Hole 801C in Jurassic oceanic crust in the western Pacific. The values average 8 × 10−14 m2 over 93 m of open hole, or 4 × 10−13 m2 if the permeable interval is confined to an 18 m thick hydrothermal zone within oceanic basement. These values are about 1–10 times higher than those reported for the upper sections of Holes 395A, 504B and 735B in 3.7, 5.9 and 11 Ma old oceanic crust respectively. The discovery that 160 Ma old oceanic crust contains a zone with extremely high permeability is not predicted by any model of ocean crustal evolution. The high permeability interval appears to be associated with the burial by off-ridge volcanism of a zone of hydrothermal precipitates and altered basalts. The generality of this result may depend on the generality of off-ridge volcanism necessary to create and preserve such zones of high permeability within the ocean crustal section. Although the crustal and permeability structures detected at Hole 801C may not fit easily into currently accepted models of crustal accretion and aging, the generality of off-ridge volcanism suggests that these structures could actually be typical of large portions of the world's oceanic crust.

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Published date: 1993

Identifiers

Local EPrints ID: 468486
URI: http://eprints.soton.ac.uk/id/eprint/468486
ISSN: 0012-821X
PURE UUID: 110fd08f-a65a-4003-b0cf-009f9c6a5727
ORCID for Paul Wilson: ORCID iD orcid.org/0000-0001-6425-8906

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Date deposited: 16 Aug 2022 16:44
Last modified: 23 Feb 2024 02:38

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Contributors

Author: Roger L. Larson
Author: Andrew T. Fisher
Author: Richard D. Jarrard
Author: Keir Becker
Author: Paul Wilson ORCID iD

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