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Mineralium Deposita

, Volume 30, Issue 3–4, pp 257–267 | Cite as

Geology and ore genesis of the manganese ore deposits of the Postmasburg manganese-field, South Africa

  • E. von Plehwe-Leisen
  • D. D. Klemm
Article

Abstract

The Postmasburg Mn/Fe-ores occur exclusively in dolomitic Precambrian sinkhole structures with siliceous breccias and shales as hostrocks. The main manganese minerals are braunite and bixbyite, apart from secondary alteration products of the psilomelane-manganomelane family. Various generations of ore minerals could be identified. The ore mineralization is subdivided into three different genetic types. They are classified either as pure karst deposits or as combined formations of karst origin and shallow marine sedimentation due to the transgression of the Banded Iron Formation (BIF) sea. Post-sedimentary metamorphism is identified as very low grade. The development of the different ore types is illustrated schematically.

Keywords

Shale Breccia Marine Sedimentation Combine Formation Banded Iron Formation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1995

Authors and Affiliations

  • E. von Plehwe-Leisen
    • 1
  • D. D. Klemm
    • 1
  1. 1.Department of GeologyUniversity of MunichMunichGermany

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