Off-axis hydrothermal circulation: parametric tests of a refined model of processes at Deep Sea Drilling Project/Ocean Drilling Program site 504

A. T. Fisher, K. Becker, T. N. Narasimhan

Research output: Contribution to journalArticle

66 Scopus citations

Abstract

A refined model of coupled heat and fluid flow has been developed to numerically simulate off-axis hydrothermal circulation through the upper oceanic crust. Curvilinear simulations of circulation at Deep Sea Drilling Project/Ocean Drilling Program site 504 confirm the broad conclusions derived from the rectilinear simulations of Fisher et al. (1990) but also suggest that permeability within the upper few hundred meters of crust around hole 504B must be concentrated within several narrow zones. Within these highly permeable zones, absolute permeability may be several orders of magnitude higher than the bulk permeability measured for the upper crust as a whole. A series of detailed parametric simulations was conducted to determine the quantitative importance of basal heat flow, seafloor bathymetry, basement relief, and differential sediment thickness in modifying the geometry and intensity of off-axis hydrothermal circulation. These studies reveal that basement relief and differential sediment thickness are more important than seafloor bathymetry in enhancing off-axis convection within the seafloor. -from Authors

Original languageEnglish (US)
Pages (from-to)3097-3121
Number of pages25
JournalJournal of Geophysical Research
Volume99
Issue numberB2
DOIs
StatePublished - Jan 1 1994
Externally publishedYes

ASJC Scopus subject areas

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

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