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Showing 1 to 20 of 25 for “"Bushveld Complex"”.
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The 'Ins' and 'Outs' of the Bushveld Complex Upper Zone
… geodynamic evolution of the Upper Zone of the Bushveld Complex. The Bushveld Complex is one of the few large layered intrusions in which the entire cumulate stratigraphy is preserved and well-exposed from its base to its roof. Despite this unique feature, relatively little is known about the …
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Geochemical characteristics and rare earth element trends of the Upper Zone in the western Bushveld Complex
… crystallization of the Upper Zone in the western Bushveld. The geochemical characteristics of the western Bushveld Upper Zone are also briefly compared to the Upper Zone of the eastern Bushveld as exposed in the Roossenekal district. The rock types intersected by the Bierkraal 1 borehole consist …
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Development of the Platreef in the northern limb of the Bushveld Complex at Sandsloot, Mokopane District, South Africa
… Layered Suite in the northern limb of the Bushveld Complex. The reef lies unconformably on a footwall (floor) sequence of Transvaal Supergroup sedimentary rocks and Archaean granite/gneiss basement, and is overlain by a hangingwall (roof) of Main Zone gabbronorites. Structural relationships …
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An investigation into the formation of the lower Main Zone in the eastern limb of the Bushveld complex, South Africa
The Main Zone is dominated by medium – grained, homogeneous gabbronorite, and anorthosites. The plagioclase compositions of the core is ((Na(0.227 – 0.353), K (0.012 – 0.046), Ca (0.651 – 0.777)) Al (1.630 – 1.752) Si (2.183 – 2.345) O8) and at the rim is ((Na (0.189 – 0.371), K (0.005 – 0.108), Ca …
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P-T estimates of peak Bushveld metamorphism in the eastern Bushveld complex, Limpopo Province, South Africa : constraints from P-T pseudosections
The Bushveld Igneous Complex (BIC) is the largest layered mafic intrusion in the world and contains the largest known deposits of vanadium, chromium and Platinum group elements on the planet, as well as large deposits of iron, nickel, copper, tin and fluorite. To aid and improve our understanding …
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A multi-isotopic geochemical investigation of the Lower Zone, Bushveld Complex, South Africa: implications for a crustal component for parental magmas
… current study focuses on the Lower Zone of the Bushveld Complex, South Africa using multiple geochemical and isotopic systems to determine the origin of crustal signatures, i.e. crustal assimilation or recycled crust in the mantle source, present throughout the Rustenburg Layered Suite (RLS) …
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Some aspects of the geochemistry of platinum, palladium, and gold in igneous rocks with special reference to the Bushveld Complex, Transvaal
Thesis. (Ph.D.) Massachusetts Institute of Technology. Dept. of Geology and Geophysics, 1954.
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The Application of Machine Learning Methods to Portable X-Ray Fluorescence Data: A Case Study from Zwartfontein Farm, Northern Limb of the Bushveld Complex, South Africa
… as a case study, on the Northern Limb of the Bushveld Complex of South Africa – a complex multi-commodity deposit (Ni-Cu-(Co)-PGE) comprising intricately layered mafic-ultramafic cumulate rocks overprinted by variable alteration minerals. Although pXRF provides rapid multi-elemental analysis, …
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The discovery of baddeleyite (ZrO2) and chrome spinel in the basal Rooiberg Group of the 2.057 Ga Bushveld Complex, South Africa: Implications for the impact and igneous scenarios for the petrogenesis of the Rooiberg Group.
… thick siliceous Rooiberg Group of the 2.057 Ga Bushveld Complex, South Africa. The discovery of composite zircon-baddeleyite grains and chromite in the Basal Rhyolite demands a reassessment of proposed scenarios for its petrogenesis. These scenarios include: 1) crustal melting caused by, and …
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A geochemical profile through the Uitkomst Complex on the farm Slaaihoek, with special reference to the platinum-group elements and Sm-Nd isotopes
The Uitkomst Complex is a mineralized, layered basic to ultrabasic intrusion, hosted by sedimentary rocks of the lower part of the Transvaal Supergroup. It is situated on the farms Uitkomst 541JT and Slaaihoek 540JT, about 25 km north of Badplaas and 50 km east of the eastern limb of the Bushveld …
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An electrochemical investigation of platinum group minerals
The Bushveld complex is the largest ore body in the world hosting platinum group elements (PGEs). It is a stratified orebody with three major reefs namely, the Merensky reef, UG2 reef and the Platreef. Platinum and palladium are the most abundant PGEs found in the Bushveld complex. They occur in …
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Surface characterisation and flotation behaviour of the platinum and palladium arsenide, telluride and sulphide mineral species
… Platreef is located in the northern limb of the Bushveld Complex of South Africa. This reef consists of a complex assemblage of rock types, with pyroxenites, serpentinites and calcsilicates being the most abundant. The predominant PGMs are the tellurides, arsenides, alloys and sulphides. The Pt …
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The oxygen, carbon & hydrogen isotope geochemistry of the Phalaborwa Complex, South Africa
The 2060 ± 2 Ma Phalaborwa Complex is a pipe-like ultramafic to carbonatite intrusion formed from multiple magma pulses. This produced a main pipe of pyroxenite, carbonatite and foskorite (olivineapatite-magnetite-calcite) and many smaller syenite plugs around the pipe. The complex is the oldest …
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In situ mineral geochemistry as a guide to ore-forming processes
… Cu-Au deposits. These studies revealed complex chemical zonation, providing a detailed record of cryptic fluid chemistry and depositional processes. A distinct isotopic signature and residual metastable silica hydrates in quartz microcrystals from the El Indio deposit, Chile provided the …
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In situ mineral geochemistry as a guide to ore-forming processes
… Cu-Au deposits. These studies revealed complex chemical zonation, providing a detailed record of cryptic fluid chemistry and depositional processes. A distinct isotopic signature and residual metastable silica hydrates in quartz microcrystals from the El Indio deposit, Chile provided the …
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Investigation of the surface properties of gangue minerals in PGM bearing ores
… associated sulphides by froth flotation from the Bushveld Igneous Complex is complicated by the presence of naturally floatable gangue minerals such as talc. Although talc is present in small quantities it has a disproportionate effect on concentrate grade by enhancing froth stability and …
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An investigation into chemical factors that affect the behaviour of Gangue minerals in the flotation of PGM ores
… of Platinum Group Elements (PGE) from the Bushveld Complex in South Africa. This process aims to optimise the recovery of valuable PGE and sulphide minerals and the rejection of unwanted gangue minerals. The major reefs are exploited in South Africa i.e. Merensky reef and UG-2 reef. Gangue …
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A quality control model for the development of high-confidence flotation test data
… test data for the Merensky ore type found in the Bushveld complex of South Africa. The complex nature of the platinum-group element (PGE) deportment in this ore renders the normally-practiced procedures inappropriate for this particular testwork. A more robust and thorough procedure is necessary …
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Application of the 190Pt-186Os isotope decay system to dating platinum-group minerals
… well constrained situations. The age of the Bushveld Complex has been measured using various radioisotope chronometers which yield ages ranging from 1921 – 2165 Ma, although an age of 2054 Ma is widely accepted. We present an accurate isochron age of 2012 ± 47 Ma (2σ, n = 50, MSWD = 1.19) for …
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