NDLI: Trace element distribution in uraninite from Mesoarchaean Witwatersrand conglomerates (South Africa) supports placer model and magmatogenic source

Content Provider	Springer Nature Link
Author	Depiné, M. Frimmel, H. E. Emsbo, P. Koenig, A. E. Kern, M.
Copyright Year	2013
Abstract	The first systematic analyses of the trace and rare earth element (REE) distribution in uraninite from various gold-bearing conglomerates of the Mesoarchaean Central Rand Group in South Africa’s Witwatersrand Basin by in situ laser ablation-inductively coupled plasma-mass spectrometry confirms a placer origin for the uraninite and a magmatogenic provenance thereof. The chemistry of commonly rounded to sub-rounded uraninite is highly variable from grain to grain but generally marked by elevated Th, W, Bi, Mo, Ta, Y, REE contents and unusually high Au concentrations. Especially, the high Th contents and the chondrite-normalised REE patterns are incompatible with post-sedimentary hydrothermal genetic models for the U mineralisation and point to derivation of the detrital uraninite from a high-temperature, magmatogenic, presumably granitic to pegmatitic source. The elevated Au concentrations (of as much as 67 ppm) in this uraninite are unique to the Witwatersrand and hint at a granitic hinterland that was enriched in both U and Au, thus presenting a potential source domain for some of the detrital gold in the Witwatersrand conglomerates. Minute fracture fills of brannerite in close proximity to the larger, rounded uraninite grains are devoid of detectable Bi, Mo, REE and Au and have only very low concentrations of Th, W, Ta and Y. This is explicable by crystallisation from a low-temperature hydrothermal fluid. Thus, Witwatersrand U phases show, analogous to many other ore constituents, such as pyrite and gold, clear evidence of partial, short-range mobilisation of originally detrital particles by post-sedimentary fluids.
Starting Page	423
Ending Page	435
Page Count	13
File Format	PDF
ISSN	00264598
Journal	Mineralium Deposita
Volume Number	48
Issue Number	4
e-ISSN	14321866
Language	English
Publisher	Springer-Verlag
Publisher Date	2013-03-06
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Uraninite Witwatersrand Trace elements Gold Archaean atmosphere Geology Mineral Resources Mineralogy
Content Type	Text
Resource Type	Article
Subject	Geophysics Economic Geology Geochemistry and Petrology

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Reply to comments by T. Oberthür on “Trace element distribution in uraninite from Mesoarchaean Witwatersrand conglomerates (South Africa) supports placer model and magmatogenic source”

Comments on “Trace element distribution in uraninite from Mesoarchaean Witwatersrand conglomerates (South Africa) supports placer model and magmatogenic source” by Depiné et al. (Mineralium Deposita 48: 423–435, 2013)

Trace-element characteristics of different pyrite types in Mesoarchaean to Palaeoproterozoic placer deposits

First whiffs of atmospheric oxygen triggered onset of crustal gold cycle

Paragenesis of mineralization within fractured pebbles in Witwatersrand conglomerates

Microstructural evolution and trace element mobility in Witwatersrand pyrite

Archaean lode gold mineralisation in banded iron formation at the Kalahari Goldridge deposit, Kraaipan Greenstone Belt, South Africa

Sulfur sources of sedimentary “buckshot” pyrite in the Auriferous Conglomerates of the Mesoarchean Witwatersrand and Ventersdorp Supergroups, Kaapvaal Craton, South Africa

Comments on “Trace-element characteristics of different pyrite types in Mesoarchaean to Palaeoproterozoic placer deposits” by Koglin et al. (Mineralium Deposita 42: 259–280, 2010)

Trace element distribution in uraninite from Mesoarchaean Witwatersrand conglomerates (South Africa) supports placer model and magmatogenic source

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Reply to comments by T. Oberthür on “Trace element distribution in uraninite from Mesoarchaean Witwatersrand conglomerates (South Africa) supports placer model and magmatogenic source”

Comments on “Trace element distribution in uraninite from Mesoarchaean Witwatersrand conglomerates (South Africa) supports placer model and magmatogenic source” by Depiné et al. (Mineralium Deposita 48: 423–435, 2013)

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Trace element distribution in uraninite from Mesoarchaean Witwatersrand conglomerates (South Africa) supports placer model and magmatogenic source