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- Publisher
- Wiley
- Copyright
- Copyright © 1990 by the American Geophysical Union.
- ISSN
- 0094-8276
- eISSN
- 1944-8007
- DOI
- 10.1029/GL017i006p00709
- Publisher site
- See Article on Publisher Site
Abstract
Darcy's Law flow in a permeable medium, consisting of uniform parallel evenly spaced fractures, is used to elucidate how thermoelastic effects may modify the permeability and flow in fracture‐controlled hydrothermal systems. Some simple permeability models are then used to investigate whether black smoker venting can result from focussing of low velocity porous flow into fractures at shallow depths (≃ 100 m.). The models indicate that: (a) thermoelastic processes may be important in controlling the temporal evolution of hydrothermal upflow zones; (b) permeability structure, not just the bulk value of the permeability, may be critical for the formation of black smokers; (c) a small zone extending to a depth of ≃ 100 m containing a few fractures a factor of 2 or more wider than average may be sufficient to focus upflow into discrete vents provided thermoelastic and chemical effects seal parts of the upper crust.
Journal
Geophysical Research Letters – Wiley
Published: May 1, 1990