A carbonate-banded iron formation transition in the Early Protorezoicum of South Africa
Date
1992
Authors
Halbich I.W.
Lamprecht D.
Altermann W.
Horstmann U.E.
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Journal ISSN
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Abstract
Seven new and two resurveyed stratigraphic sections through the important carbonate-BIF transition in Griqualand West are presented and compared with six published sections. Lateral correlation within this zone is attempted but the variability was found to be too great for meaningful subdivision. Substantial lithological irregularity is the only unifying character of this zone, for which the new name Finsch Member (Formation) is proposed. Vertical and lateral lithological variations as well as chemical changes across this zone are discussed with reference to environmental aspects. Local and regional considerations lead to the conclusion that fresh water-sea water mixing occurred in a shallowing basin. © 1992.
Description
Keywords
banded ironstone formation, carbonate rock, depositional environment, Proterozoic, stratigraphy, transitional sequence, South Africa, Griqualand West
Citation
Journal of African Earth Sciences
15
2
15
2