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: Environmental controls on sulfate reduction and iron sulfide mineral formation
  name:
    name part: Lin, Saulwood
    name part: 1957-
    role:
      role term: creator
  name:
    name part: Morse, John W.
    role:
      role term: degree supervisor.
  name:
    name part: Brooks, James M.
    role:
      role term: degree committee member.
  name:
    name part: Grossman, Ethan L.
    role:
      role term: degree committee member.
  name:
    name part: Loeppert, Richard H.
    role:
      role term: degree committee member.
  name:
    name part: Presley, Bobby J.
    role:
      role term: degree committee member.
  name:
    name part: Texas A & M University
    role:
      role term: degree granting institution.
  type of resource: text
  genre: bibliography
  genre: Observations.
  genre: Academic theses
  origin info:
    place:
      place term: xx
    date issued: 1990
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: print
    extent: xviii, 190 leaves : illustrations ; 29 cm
  abstract: Sulfate reduction and iron sulfide mineral formation were investigated in Atchafalaya Bay, Louisiana, the Mississippi River delta and Gulf of Mexico continental shelf and slope sediments. The primary objective of this investigation was to determine the factors controlling these processes in different depositional environments. The influence of dissolved sulfate concentration on sulfate reduction and iron sulfide mineral formation was investigated in the freshwater to seawater transitional environment of Atchafalaya Bay. High sulfate reduction rates were observed in sediments with a salinity range of 0.2 to 22. Unexpectedly high concentrations of AVS and pyrite-S were observed in sediments with low salinity. A complete reduction of dissolved sulfate did not occur in sediments with low salinity pore waters. However, the degree of sulfidization of iron was as high as 0.95, indicating that reactive iron possibly limits sulfide mineral formation in the low salinity Atchafalaya Bay sediments. Consequently, C/S ratios are higher in the low salinity sediments than in typical marine sediments, but not because of sulfate limitation as is commonly presumed. Sulfate reduction and iron sulfide mineral formation in the Gulf of Mexico are strongly influenced by the massive amount of sediments dominantly derived from the Mississippi River. Both sulfate reduction rates and pyrite-S concentrations decrease exponentially with increasing overlying water depth. This is probably a result of decreasing sedimentation rate and organic carbon concentration. The linear relationship between sulfate reduction rate and organic carbon concentration together with the normal marine C/S ratios indicate that the concentration of organic carbon is the primary factor controlling sulfate reduction and iron sulfide mineral formation in this region. Furthermore, due to a higher organic carbon reactivity, higher sulfate reduction rates are observed in the Mississippi River delta sediments as compared to th…
  note: Typescript (photocopy).
  note: Vita.
  note: "Major subject: Oceanography."
  note: Ph. D. Texas A & M University 1990
  note: Includes bibliographical references.
  subject:
    topic: Environmental engineering
    genre: Observations
  subject:
    topic: Sulfate minerals
  subject:
    topic: Ferrous sulfate
  subject:
    topic: Oceanography
    topic: Research
  subject:
    topic: Environmental engineering
  subject:
    topic: Major oceanography
  identifier: http://proxy.library.tamu.edu/login
  related item:
    location:
      url: http://proxy.library.tamu.edu/login
  record info:
    record content source: TXA
    record creation date: 910115
    record change date: 20200904152513.0
    record identifier: in00000998248
    language of cataloging:
      language term: eng