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Diagenetic origin of the stratiform Cu–Co deposit at Kamoto in the Central African Copperbelt
- Source :
- Mineralium Deposita, Mineralium Deposita, Spinger, 2015, 50 (4), pp.437-447. ⟨10.1007/s00126-015-0582-3⟩
- Publication Year :
- 2015
- Publisher :
- Springer Science and Business Media LLC, 2015.
-
Abstract
- International audience; Sediment-hosted stratiform ore deposits that underwent metamorphism and orogenesis are interpreted either to have a multiphase origin that might in part predate these events or to be exclusively related to fluid migration during the orogeny. This controversy concerns the formation of many world-class sediment-hosted ore deposits such as in the Central African Copperbelt. Here we present Re-Os dating results for disseminated and stratiform Cu-Co sulfide pseudomorphs after anhydrite in nodules and layers from the Copperbelt. Results demonstrate that at least some of the ores formed at around 800 Ma during rifting and basin development, and thus predate the Pan-African Lufilian orogeny. Younger Re-Os ages, i.e., between 682 +/- 28 and 230 +/- 36 Ma, may be due to the replacement of the early Cu-Co sulfides by younger sulfide phases. Alternatively, these younger ages may result from the disturbance or resetting of the Re-Os system during recrystallization/metamorphism or the transition of chalcocite from its high- to its low-temperature polymorph.
- Subjects :
- Chalcocite
Recrystallization (geology)
Rift
Anhydrite
Sediment-hosted deposits
Geochemistry
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences
Metamorphism
Orogeny
engineering.material
Re-Os dating
Diagenesis
chemistry.chemical_compound
Geophysics
chemistry
Geochemistry and Petrology
engineering
Diagenetic copper sulfides
Economic Geology
Central African Copperbelt
Pseudomorph
Geology
Subjects
Details
- ISSN :
- 14321866 and 00264598
- Volume :
- 50
- Database :
- OpenAIRE
- Journal :
- Mineralium Deposita
- Accession number :
- edsair.doi.dedup.....d8f25db3c22eb742eed3307724cbf916