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New evidence for the early onset of supergene alteration along the Kalahari unconformity
Citation
Vafeas, NA and Blignaut, LC and Viljoen, KS and Meffre, S, New evidence for the early onset of supergene alteration along the Kalahari unconformity, South African Journal of Geology, 121, (2) pp. 157-170. ISSN 1012-0750 (2018) [Refereed Article]
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Copyright Statement
Copyright 2018 Geological Society of South Africa
DOI: doi:10.25131/sajg.121.0012
Abstract
The manganese ore of the Hotazel Formation in the Kalahari Manganese Field, which has been thrust along the Blackridge thrust fault, has been subjected to various degrees of pre-thrusting hydrothermal and post-thrusting supergene alteration. Coarse-grained apatite, which appears to be formed under supergene conditions on textural grounds, is present in the thrusted manganese ore in previously unrecorded abundances. U-Pb dating of this apatite within the thrusted manganese ore has placed the onset of chemical weathering of the succession at a 77 ± 7.5 Ma, approximately 35 million years earlier than previously thought for the area. This implies that erosion along the Post-African I land surface, as well as the effects of supergene alteration in the Kalahari Manganese Field must have commenced within the late Cretaceous Period, subsequent to earlier erosion along the African land surface.
Item Details
Item Type: | Refereed Article |
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Keywords: | manganese, metal ores, Upper Cretaceous, Cretaceous, Africa, manganese ores, metasomatism, South Africa, Southern Africa, U/Pb, absolute age, Mesozoic mineral deposits, genesis, Northern Cape Province, South Africa |
Research Division: | Earth Sciences |
Research Group: | Geology |
Research Field: | Geochronology |
Objective Division: | Expanding Knowledge |
Objective Group: | Expanding knowledge |
Objective Field: | Expanding knowledge in the earth sciences |
UTAS Author: | Meffre, S (Dr Sebastien Meffre) |
ID Code: | 129976 |
Year Published: | 2018 |
Funding Support: | Australian Research Council (CE0561595) |
Web of Science® Times Cited: | 10 |
Deposited By: | CODES ARC |
Deposited On: | 2019-01-02 |
Last Modified: | 2019-03-08 |
Downloads: | 0 |
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