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(Table 1) Sr and S isotope compositions of marine barites from ODP Hole 123-765C

Publication Date
DOI: 10.1594/pangaea.712435
  • 123-765C
  • Continuous-Flow Mass Spectrometry
  • Delta 34S
  • Drilling
  • Isotope Ratio Mass Spectrometry
  • Joides Resolution
  • Leg123
  • Ocean Drilling Program
  • Odp
  • Odp Sample Designation
  • Sample Code/Label
  • South Indian Ridge
  • South Indian Ocean
  • Strontium 87/Strontium 86
  • Biology
  • Chemistry
  • Earth Science
  • Geography


Barite can precipitate in microenvironments in the water column (marine barite), from supersaturated pore fluids at the oxic-anoxic boundary within marine sediments and where Ba-rich pore fluids are expelled and come into contact with sulfate-rich seawater (diagenetic barite), or from hydrothermal solutions (hydrothermal barite). Barite is relatively resistant to alteration after burial and has been used in paleoceanographic studies to reconstruct seawater chemistry and productivity through time. For such applications it is very important to determine the origin of the barite used, because both diagenetic and hydrothermal barite deposits may not accurately record the open-ocean contemporaneous seawater chemistry and productivity. We show here that it is possible to distinguish between the different types of barite by using Sr and S isotopes along with crystal morphology and size characteristics.

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