Sulfur transformations in early diagenetic sediments from the Bay of Concepcion, off Chile Metadata

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Title

  • Main Title Sulfur transformations in early diagenetic sediments from the Bay of Concepcion, off Chile

Creator

  • Author: Vairavamurth, M.A.
    Creator Type: Personal
  • Author: Wang, Shengke
    Creator Type: Personal
  • Author: Khandelwal, B.
    Creator Type: Personal
  • Author: Manowitz, B.
    Creator Type: Personal
    Creator Info: Brookhaven National Lab., Upton, NY (United States)
  • Author: Ferdelman, T.
    Creator Type: Personal
  • Author: Fossing, H.
    Creator Type: Personal
    Creator Info: Max Plank Institute for Marine Microbiology, Bremen (Germany). Dept. of Biogeochemistry

Contributor

  • Sponsor: United States. Department of Energy.
    Contributor Type: Organization
    Contributor Info: USDOE, Washington, DC (United States)

Publisher

  • Name: Brookhaven National Laboratory
    Place of Publication: Upton, New York
    Additional Info: Brookhaven National Lab., Upton, NY (United States)

Date

  • Creation: 1995-04-01

Language

  • English

Description

  • Content Description: Despite the recognition that both organic sulfur and pyrite form during the very early stages of diagenesis, and that the amount of H{sub 2}S generated in bacterial sulfate reduction primarily limits their formation, the mechanisms and the active species involved still are not clear. In this study, we quantified the major forms of sulfur distributed in sediments to assess the geochemical mechanisms involved in these transformations. XANES spectroscopy, together with elemental analysis, were used to measure sulfur speciation in the organic-rich sediments from the Bay of Concepcion, Chile. Organic polysulfides constituted the major fraction of the organic sulfur, and occurred maximally just below the sediment surface (1--3 cm), where intermediates from H{sub 2}S oxidation were likely to be generated most abundantly. Sulfonates, which could be formed through the reactions of sulfate and thiosulfate, also showed a sub-surface maximum in the vicinity of the ``oxic-anoxic interface``. These results strongly suggest a geochemical origin for organic polysulfides and sulfonates, and illustrate that intermediates from H{sub 2}S oxidation play a dominant role in incorporating sulfur into organic matter. Pyrite was absent in the surficial layer, and first appeared just below the H{sub 2}S maximum, where organic polysulfides began to decrease in abundance. From these results, we argue, that an iron monosulfide precursor formed first from reactions with H{sub 2}S, and then reacts with organic polysulfides, completing the synthesis of pyrite in the sediment column.
  • Physical Description: 24 p.

Subject

  • Keyword: Pyrite
  • Keyword: Biogeochemistry
  • Keyword: Sediments
  • Keyword: Sulfides
  • STI Subject Categories: 58 Geosciences
  • Keyword: Bays
  • Keyword: Diagenesis
  • Keyword: Sulfur
  • Keyword: Synthesis

Source

  • Other Information: PBD: Apr 1995

Collection

  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI

Institution

  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Report

Format

  • Text

Identifier

  • Other: DE95016018
  • Report No.: BNL--61964
  • Grant Number: AC02-76CH00016
  • DOI: 10.2172/105727
  • Office of Scientific & Technical Information Report Number: 105727
  • Archival Resource Key: ark:/67531/metadc622938

Note

  • Display Note: OSTI as DE95016018
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