Groote Eylandt manganese norm

A new application of mineral normalization techniques on supergene alteration products

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

The method described assists in the quantification of oxidic manganese minerals and associated materials from the Groote Eylandt manganese deposits (Northern Territory, Australia) which have been influenced by supergene processes. These ores are commonly composed of very fine grained minerals, intergrown with lateritie components like kaolinitic clays and iron oxyhydroxides. Additionally, many manganese phases are poorly-ordered structures which are difficult to identify. Although Fourier transform infrared (FTIR) spectroscopy has produced dependable data for a limited range of processed ores, it failed with rocks that contained a mixture of ore minerals and various gangue phases, as was the case with other analytical techniques (microscopic studies, XRD, IR, etc.). The normalization is based on the same principles as other mineral norms (e.g. CIPW-Norm) and the norm minerals themselves were developed according to the mineralogical conditions in the supergene manganese deposits of Groote Eylandt in the Northern Territory of Australia. Nevertheless, the list of minerals can easily be extended and adjusted to slightly different environments (e.g. bauxites). The following minerals can be obtained from this normalization technique: romanechite, todorokite, cryptomelane, pyrolusite, anatase, quartz, kaolinite, gibbsite, goethite for hematite-free and hematite-containing samples, hematite, and excess water.

Original languageEnglish
Title of host publicationSediment-Hosted Mineral Deposits
Publisherwiley
Pages2-15
Number of pages14
ISBN (Print)9781444303872, 9780632028818
DOIs
Publication statusPublished - Apr 3 2009

Fingerprint

manganese
mineral
hematite
manganese deposit
supergene process
todorokite
gibbsite
anatase
gangue
ore mineral
goethite
FTIR spectroscopy
kaolinite
norm
normalisation
product
analytical method
X-ray diffraction
quartz
iron

Keywords

  • Computerized infrared characterization of materials (CIRCOM)
  • Deposits of Groote Eylandt, containing pyrolusite, cryptomelane, romanechite and todorokite
  • Differential thermal analysis (DTA)
  • Fourier transform infrared (FTIR) spectroscopy
  • Groote Eylandt manganese deposits

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

Cite this

Groote Eylandt manganese norm : A new application of mineral normalization techniques on supergene alteration products. / Pracejus, B.

Sediment-Hosted Mineral Deposits. wiley, 2009. p. 2-15.

Research output: Chapter in Book/Report/Conference proceedingChapter

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