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dc.contributor.advisorScott, Robert B.
dc.creatorHajash, Andrew
dc.description.abstractAn experimental investigation of high-temperature seawater/basalt interactions has been conducted in order to better evaluate the geochemical and economic implications of hydrothermal circulation of seawater in the oceanic crust along active mid-ocean ridges. The results indicate that, as seawater reacts with basalt between 200°C and 500°C at 500-800 bars, the fluid tends to change from an oxygenated, slightly alkaline, Na�, Mg��, SO₄[superscipt =], Cl� solution to a reducing, acidic, Na�, Ca��, Cl� solution with Fe, Mn and Cu concentrations up to 1500, 190 and 0.3 ppm respectively. Silica concentrations in the fluid approach saturation values with respect to quartz at all temperatures; however, Al abundances remain very low (~0.5 ppm). Montmorillonite, nontronite, albite, tremolite-actinolite, chalcopyrite, pyrrhotite and hematite were the dominant alteration products formed. These data imply that large-scale circulation of seawater in the oceanic crust could account for the Al-deficient metalliferous sediments associated with mid-ocean ridges and be important in the genesis of certain Fe-Cu sulfide ore deposits. The process could also affect the geochemical budgets of certain elements and exert substantial control on the steady-state composition of seawater by removing excess Na and Mg and adding Ca, Si and H to the oceans.en
dc.format.extent61 leaves : illustrationsen
dc.rightsThis thesis was part of a retrospective digitization project authorized by the Texas A&M University Libraries. Copyright remains vested with the author(s). It is the user's responsibility to secure permission from the copyright holder(s) for re-use of the work beyond the provision of Fair Use.en
dc.subject.classification1975 Dissertation H154
dc.subject.lcshHydrothermal depositsen
dc.titleHydrothermal processes along mid-ocean ridges: an experimental investigationen
dc.typeThesisen A&M Universityen of Philosophyen
dc.contributor.committeeMemberFahlquist, Davis A.
dc.contributor.committeeMemberTieh, Thomas T.
dc.contributor.committeeMemberPresley, Bob J.
dc.contributor.committeeMemberStern, David W.
dc.format.digitalOriginreformatted digitalen
dc.publisher.digitalTexas A&M University. Libraries

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