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Physical properties of upper oceanic crust: Ocean Drilling Program Hole 801C and the waning of hydrothermal circulation
 

Summary: Physical properties of upper oceanic crust: Ocean Drilling Program
Hole 801C and the waning of hydrothermal circulation
Richard D. Jarrard,1
Lewis J. Abrams,2
Robert Pockalny,3
Roger L. Larson,3
and Tetsuro Hirono4
Received 19 December 2001; revised 4 September 2002; accepted 26 November 2002; published 8 April 2003.
[1] The hydrologic evolution of oceanic crust, from vigorous hydrothermal circulation
in young, permeable volcanic crust to reduced circulation in old, cooler crust, causes a
corresponding evolution of geophysical properties. Ocean Drilling Program (ODP) Hole
801C, which obtained the world's oldest section of in situ, normal oceanic crust,
provides the opportunity to examine relationships among hydrologic properties (porosity,
permeability, fluid flow), crustal alteration, and geophysical properties, at both core plug
and downhole log scales. Within these upper crustal basalts, fluid flux in zones with
high porosity and associated high permeability fosters alteration, particularly hydration.
Consequently, porosity is correlated with both permeability and a variety of hydration
indicators. Porosity-dependent alteration is also seen at the log scale: potassium
enrichment is strongly proportional to porosity. We extend the crustal alteration patterns
observed at Hole 801C to a global examination of how physical properties of upper

  

Source: Abrams, Lewis J. - Center for Marine Science & Department of Geography and Geology, University of North Carolina at Wilmington

 

Collections: Geosciences