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Published in:
2005 | OriginalPaper | Chapter
Trace and rare earth element chemistry of garnet and apatite as discriminant for Broken Hill-Type mineralization, Namaqua Province, South Africa
Authors : Marcel Stalder, Abraham Rozendaal
Published in: Mineral Deposit Research: Meeting the Global Challenge
Publisher: Springer Berlin Heidelberg
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This paper reports trace and rare earth element data of garnet and apatite from the Broken Hill-type Gamsberg Zn-Pb deposit and several occurrences of Fe-rich but base metal sulphidepoor metahydrothermal rocks in the Namaqua Province of South Africa. Garnet and apatite within ore-bearing assemblages at Gamsberg are characterised by a prominent positive Eu anomaly, which is not developed in metahydrothermal host rocks at Gamsberg and the investigated ferrugious rocks in the Namaqua Province. The positive Eu anomaly is interpreted as a premetamorphic signature related to the initial ore-forming fluids. It indicates that relatively hot (200–250‰C) and reduced metal-rich brines were responsible for the emplacement of the ores. This distinct ore-related signature may serve as geochemical discriminant in the exploration for Broken Hill-type deposits.