Geochemistry of supergene manganese oxide deposits, Groote Eylandt, Australia

B. Pracejus, B. R. Bolton

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Abstract

Some 20 different supergene Mn oxide ores and associated secondary rocks from the Groote Eylandt manganese deposit were analyzed for their major, minor, and trace element content. It is possible to correlate groups of trace elements to individual minerals using a quantitative normalization technique that determines the mineralogical composition of the samples. Members of these groups tend to be elements with specific ionic radii, contained in the following host phases: pyrolusite (~0.4 Å and ≥1 Å), cryptomelane and todorokite (~0.7 Å), romanechite (no signficant correlation detected), kaolinite (~0.6, 0.8 and 1.0 Å), and goethite (~0.4 Å). Generally, distinctive supergene horizons, enriched in certain elements (eg Zn, Sr) and minerals, develop within the stratigraphic section. -from Authors

Original languageEnglish
Pages (from-to)1310-1335
Number of pages26
JournalEconomic Geology
Volume87
Issue number5
DOIs
Publication statusPublished - 1992

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ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

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