Modern sulfide ores at mid-atlantic ridge and pacific back-arc basins: Fluid inclusion, hydrocarbon and he, ar, and s isotope studies

摘要

A comparative study of fluid inclusions, He, Ar, and hydrocarbons in fluid inclusions trapped in sulfides and S isotopes in sulfides from modern sulfide edifices on the Mid-Atlantic ridge and in the Manus and Lau back-arc basins (Pacific) was carried out. Variations in fluid salinity were found. Methane through butane occur in fluids. R/Ra ratio indicates a contribution of helium from upper mantle and recycled seawater to fluids. The S isotope ratio suggest a mixing of sulfur derived from different sources.