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175 FIFTH AVE, NEW YORK, NY 10010
Mineralium Deposita, 1995, Vol 30, Issue 4, p. 257-267
GEOLOGY AND ORE GENESIS OF THE MANGANESE ORE-DEPOSITS OF THE POSTMASBURG MANGANESE-FIELD, SOUTH-AFRICA
Vonplehweleisen E. , Klemm D. D. ,
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
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: breccia, breccias, deposit, deposits, family, genesis, geology, germany, iron, karst, manganese, marine, mineralization, minerals, ore deposits, ore-deposits, origin, products, sea, sedimentation, shale, shallow marine, sinkhole, south africa, south-africa, structure, time, times, transgression,