Stable isotopes and fluid inclusion study of anhydrite from the East Pacific Rise at 21oN.

M. Kusakabe, H. Chiba, H. Ohmoto

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

The wide variation in the fluid inclusion T (180o-360oC) of anhydrite samples from the East Pacific Rise at 21oN suggests that anhydrite precipitation took place during a wide range (-0 to -50%) of sea-water mixing. Sea-water sulphate origin for anhydrite- sulphur is indicated by delta 34S values that are essentially identical with the present-day sea-water sulphate value, whereas the delta 18O values are up to 2per mille higher than the sea-water sulphate value. This enrichment of 18O may be attributed to partial equilibration of fine-grained anhydrite with solutions at lower T after deposition. Absence of anhydrite in dead vents suggests that 031SO42- slightly enriched in 18O is added to sea-water sulphate owing to dissolution of anhydrite after the cessation of a high-T stage of hydrothermal activity.-Y.H.

Original languageEnglish
Pages (from-to)89-95
Number of pages7
JournalGeochemical Journal
Volume16
Publication statusPublished - 1982
Externally publishedYes

Fingerprint

sea water
anhydrite
Isotopes
fluid inclusion
stable isotope
isotopes
Sulfates
inclusions
sulfates
Fluids
Water
fluids
seawater
sulfate
Vents
vents
Sulfur
hydrothermal activity
dissolving
Dissolution

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

Stable isotopes and fluid inclusion study of anhydrite from the East Pacific Rise at 21oN. / Kusakabe, M.; Chiba, H.; Ohmoto, H.

In: Geochemical Journal, Vol. 16, 1982, p. 89-95.

Research output: Contribution to journalArticle

Kusakabe, M. ; Chiba, H. ; Ohmoto, H. / Stable isotopes and fluid inclusion study of anhydrite from the East Pacific Rise at 21oN. In: Geochemical Journal. 1982 ; Vol. 16. pp. 89-95.
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