Genetic implications of halide enrichment near a Mississippi Valley-type ore deposit.

S. V. Panno, G. Harbottle, E. V. Sayre, W. C. Hood

Research output: Contribution to journalArticle

Abstract

Analysis of samples of host dolomite from the Buick Pb-Zn-Cu deposit, Viburnum Trend, SE Missouri, by instrumental NAA and XRF techniques has revealed distinct wallrock enrichment of both Br and Cl. The presence of this halide enrichment zone extending up to 250' from the deposit is strong evidence that the ore-forming solutions of the Viburnum Trend were metal-rich Na-Cl brines. Br/Cl ratios asymptotically decrease (from approx 0.009 to 0.003) with distance from the deposit. The relatively high ratios near the deposit reflect that of the ore-forming solutions, whereas the lower ratios away from the deposit reflect the solutions present during the formation of the host rock. Ore-forming solutions were enriched in Br relative to sea-water and were extremely saline (4.0-5.0 molal chloride), suggesting they initially formed from bitterns by sea-water evaporation beyond the point of halite precipitation.-J.E.S.

Original languageEnglish (US)
Pages (from-to)150-156
Number of pages7
JournalUnknown Journal
Volume78
Issue number1
DOIs
StatePublished - Jan 1 1983
Externally publishedYes

ASJC Scopus subject areas

  • Geophysics
  • Geology
  • Geochemistry and Petrology
  • Economic Geology

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