Abstract
The Neoproterozoic and its transition into the Cambrian was a time of major geological, e v o l u t i o n a r y and geochemica l changes. Geological key features include the break-up of the supercontinent(s) (i.e. Smith et aL 1981), lowlatitude glaciations (Kirschvink 1992), deposition of iron-formations (Klein & Beukes 1992) and evaporites (Zharkov 1984). Evolutionary features include extinction and radiation events (i.e. Brasier 1979, 1982). Geochemical changes include secular variations of the global carbon, sulphur and strontium isotope records (i.e. Derry et aL 1992, Strauss 1993, Kaufman et al. 1993, Kaufman & Knoll 1994). Constraints regarding the Neoproterozoic sedimentary sulphur cycle and its isotopic characteristics can be derived from marine evaporite deposits as tracers for past seawater composition and sedimentary pyrite, reflecting the activity of sulphate reducing bacteria. Results will be presented from a recent worldwide survey of more than 250 Neoproterozoic and early Cambrian samples (evaporites, carbonates, elastic sediments) with respect to their sulphur geochemistry and isotopic composition. In addition, relevant literature data have been compiled.
Published Version
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