Proterozoic sedimentary exhalative ( SEDEX ) deposits and links to evolving global ocean chemistry

  title={Proterozoic sedimentary exhalative ( SEDEX ) deposits and links to evolving global ocean chemistry},
  author={Timothy W. Lyons and Anne M. Gellatly},
Sedimentary exhalative (SEDEX) Zn-Pb-sulfi de mineralization fi rst occurred on a large scale during the late Paleoproterozoic. Metal sulfi des in most Proterozoic deposits have yielded broad ranges of predominantly positive δS values traditionally attributed to bacterial sulfate reduction. Heavy isotopic signatures are often ascribed to fractionation within closed or partly closed local reservoirs isolated from the global ocean by rifting before, during, and after the formation of Rodinia… CONTINUE READING
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