Effects of mass transfer, compaction and secondary porosity on hydrothermal upgrading of Paleoproterozoic sedimentary manganese ore in the Kalahari manganese field, South Africa

J. Gutzmer; N. J. Beukes

doi:10.1007/s001260050090

Effects of mass transfer, compaction and secondary porosity on hydrothermal upgrading of Paleoproterozoic sedimentary manganese ore in the Kalahari manganese field, South Africa

J. Gutzmer, N. J. Beukes

Geology

University of Johannesburg

Research output: Contribution to journal › Article › peer-review

23 Citations (Scopus)

Abstract

In the northwestern part of the Kalahari manganese field low-grade carbonate-rich Mamatwan-type ore is altered to high-grade oxide-rich Wessels-type ore in association with normal faults. Mass balance calculations, based on the assumption that manganese was geochemically immobile, suggest that upgrading of the manganese ore can be attributed to leaching of Mg, Ca, CO₂ and SiO₂ from the sedimentary ore with residual enrichment of Mn. Hydrothermal alteration resulted in development of about 10 to 20% of secondary porosity in the ores and the orebed was compacted to two thirds of its original stratigraphic thickness.

Original language	English
Pages (from-to)	250-256
Number of pages	7
Journal	Mineralium Deposita
Volume	32
Issue number	3
DOIs	https://doi.org/10.1007/s001260050090
Publication status	Published - May 1997

ASJC Scopus subject areas

Geophysics
Geochemistry and Petrology
Economic Geology

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Effects of mass transfer, compaction and secondary porosity on hydrothermal upgrading of Paleoproterozoic sedimentary manganese ore in the Kalahari manganese field, South Africa

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