Information Circular, Issue 89Economic Geology Research Unit, University of the Witwatersrand, 1960 - Geology |
Other editions - View all
Common terms and phrases
area studied assemblage banded iron formation barred basin basal transition zone Black Reef Quartzite bodies of primary brines Bushveld Complex calcium carbonate carbonaceous mudstone carbonate deposition carbonate detritus CARBONATE SEDIMENTARY CYCLES carbonate sediments carbonate with chert centimetres Chert Dolomite Light-Colored Chert Zone clastic clastic sediment concentrations of iron disconformities dolomite and chert Duitschland Formation END-MEMBER IN CARBONATE evaporite facies-belt Field evidence Figure fluvial formation Iron-rich carbonate grades upwards grunerite grunerite-bearing hematite higher-than-normal intraclastic breccia iron and manganese iron and silica IRON CONCENTRATION iron distribution iron formation precursor iron peaks Iron-Enrichment iron-poor iron-rich dolomite iron-rich sediments kilometres laterally impersistent Lower Dolomite magnetite Malmani Dolomite mega-cycle metres thick mixed zone northeastern Transvaal Olifants River Group oölite overlain Penge Formation Pretoria Group primary limestone principal iron formation Proto-iron formation Iron-rich regionally-persistant schematic second iron formation sedimentary structures shale stratigraphic STRATIGRAPHIC RELATIONSHIPS stromatolite terriginous sedimentation Transvaal Basin Transvaal epeiric sea Transvaal Supergroup Upper Dolomite waters