rdf-syntax-grammar
mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    title: Hydrothermal processes along mid-ocean ridges: an experimental investigation
  name:
    name part: Hajash, Andrew.
    role:
      role term: creator
  name:
    name part: Fahlquist, Davis A.
    role:
      role term: degree committee member.
  name:
    name part: Presley, Bob J.
    role:
      role term: degree committee member.
  name:
    name part: Scott, Robert B.
    role:
      role term: degree supervisor.
  name:
    name part: Stern, David W.
    role:
      role term: degree committee member.
  name:
    name part: Tieh, Thomas T.
    role:
      role term: degree committee member.
  name:
    name part: Texas A & M University
    role:
      role term: degree granting institution.
  type of resource: text
  genre: theses
  genre: Academic theses
  origin info:
    place:
      place term: txu
    date issued: 1975
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: print
    extent: 61 leaves illustrations
  abstract: An 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.
  note: Ph. D. in Geology Texas A & M University
  subject:
    topic: Hydrothermal deposits
  subject:
    topic: Major geology
  classification: QE431.5 .H36
  identifier: http://proxy.library.tamu.edu/login
  identifier: https://hdl.handle.net/1969.1/DISSERTATIONS-182868
  related item:
    location:
      url: http://proxy.library.tamu.edu/login
  related item:
    location:
      url: https://hdl.handle.net/1969.1/DISSERTATIONS-182868
  record info:
    record content source: TXA
    record creation date: 791206
    record change date: 20220103135446.0
    record identifier: in00000180106
    language of cataloging:
      language term: eng