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Dissertations / Theses on the topic 'Bushveld complex'

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Published: 4 June 2021

Last updated: 15 February 2022

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1

Everitt, Simon James. "Evolution of the UG2 unit, Bushveld Complex, South Africa : mineral composition and petrological evidence." Thesis, Rhodes University, 2013. http://hdl.handle.net/10962/d1001573.

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Several disequilibrium textures are found to occur within the hanging wall and footwall of the UG2 chromitite layer of the Bushveld Complex, South Africa. These textures include plagioclase chadacrysts found included within orthopyroxene and clinopyroxene as well as the orthopyroxenes exhibiting round crystal boundaries that appear to be resorbed. Textures found within the UG2 stratigraphy such as linear boundaries and 120° triple junctions at interfaces of adjacent plagioclase or pyroxene grains also suggest that recrystallization has taken place. The presence of both disequilibrium textures

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2

Curl, Edward Alexander 1972. "Parental magmas of the Bushveld Complex, South Africa." Monash University, Dept. of Earth Sciences, 2001. http://arrow.monash.edu.au/hdl/1959.1/9080.

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3

Gwatinetsa, Demand. "Distribution of iron-titanium oxides in the vanadiferous main magnetite seam of the upper zone : Northern limb, Bushveld complex." Thesis, Rhodes University, 2014. http://hdl.handle.net/10962/d1013281.

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The main magnetite seam of the Upper Zone of the Rustenburg Layered Suite (SACS, 1980) on the Bushveld Complex is known to host the world‘s largest vanadium bearing titaniferous iron ores. The vanadiferous titanomagnetites, contain vanadium in sufficient concentrations (1.2 - 2.2 per cent V₂O₅) to be considered as resources and vanadium has been mined historically by a number of companies among them Anglo-American, Highveld Steel and Vanadium and VanMag Resources as well as currently by Evraz Highveld Steel and Vanadium Limited of South Africa. The titanomagnetites contain iron ore in the form

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4

Lovegrove, Daniel Paul. "Rates and mechanisms of metamorphic processes derived from thermal aureole studies." Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249305.

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5

Sargeant, Fiona. "The seismic stratigraphy of the Bushveld Igneous Complex, South Africa." Thesis, University of Liverpool, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.250322.

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6

Twala, Mthokozisi Nkosingiphile. "Use of multispectral remote sensing data to map magnetite bodies in the Bushveld Complex, South Africa : a case study of Roossenekal, Limpopo." Diss., University of Pretoria, 2019. http://hdl.handle.net/2263/75756.

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Mineral detection and geological mapping through conventional ground survey methods based on field observation and other geological techniques are tedious, time-consuming and expensive. Hence, the use of remote sensing in mineral detection and lithological mapping has become a generally accepted augmentative tool in exploration. With the advent of multispectral sensors (e.g. ASTER, Landsat and PlanetScope) having suitable wavelength coverage and bands in the Shortwave Infrared (SWIR) and Thermal Infrared (TIR) regions, multispectral sensors, along with common and advanced algorithms, have beco

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7

Koegelenberg, Corne. "Experimental evidence for sulphide magma percolation and evolution : relevant to the chromite bearing reefs of the Bushveld Complex." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/20043.

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Thesis (MSc)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: Pt mineralization within the Bushveld Complex is strikingly focused on the chromitite reefs, despite these horizons being associated with low volumes of base metal sulphide relative to Pt grade. Partitioning of Pt (Dsil/sulp) from silicate magma into immiscible sulphide liquid appears unable to explain Pt concentrations in chromitite horizons, due to the mismatch that exists between very large R factor required and the relevant silicate rock volume. Consequently, in this experimental study we attempt to gain better insight into

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8

Venter, Andrew Derick. "Air quality assessment of the industrialized western Bushveld Igneous Complex / Andrew Derick Venter." Thesis, North-West University, 2011. http://hdl.handle.net/10394/8530.

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South Africa has the largest economy in Africa, with significant mining and metallurgical activities. A large fraction of the mineral assets is concentrated in the Bushveld Igneous Complex (BIC), with the western limb being the most exploited. Although the western BIC is considered to be an air pollution hotspot, inadequate air quality data currently exists for this area. To partially address this knowledge gap, a comprehensive air quality monitoring station was operated for more than two years at Marikana in the western BIC. Basic meteorological parameters, precipitation, Photosynthetic Photo

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9

Manyeruke, Tawanda Darlington. "Compositional and lithological variation of the Platreef on the farm Nonnenwerth, northern lobe of the Bushveld Complex implications for the origin of platinum-group elements (PGE) mineralization /." Thesis, Pretoria : [s.n.], 2008. http://upetd.up.ac.za/thesis/available/etd-01192009-164657/.

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10

Botha, Pieter W. S. K. "The mineralogy and geochemistry of the Rooikoppies iron-rich ultramafic pegmatite body, Karee Mine, Bushveld Complex, South Africa [electronic resource] /." Pretoria : [s.n.], 2008. http://upetd.up.ac.za/thesis/available/etd-01272009-172307/.

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11

Kleemann, Gunther Johann. "The Geochemistry and petrology of the roofrocks of the Bushveld complex east of Groblersdal." Diss., University of Pretoria, 1985. http://hdl.handle.net/2263/29478.

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12

Teigler, Bernd. "Mineralogy, petrology and geochemistry of the lower and lower critical zones, Northwestern Bushveld Complex." Thesis, Rhodes University, 1991. http://hdl.handle.net/10962/d1005590.

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This study of the lower part of the Rustenburg Layered Suite in the Western Bushveld Complex is based mainly on drill core samples from three localities, which are approximately 130 km apart. The NG-sequence, situated in the northwestern sector of the complex (Union Section, R.P.M.) extends from the floor of the complex to the base of the upper Critical Zone. The sequence is ca. 1800 m thick and it comprises mainly ultramafic cumulates, namely pyroxenites, olivine pyroxenites, harzburgites and dunites. Norites and anorthos ites are present only in minor proportion. Within the upper half of the

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13

Mooney, David G. "An evaluation of small scale open cast mining of UG2 in the Bushveld complex." Thesis, Rhodes University, 1997. http://hdl.handle.net/10962/d1005555.

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The current weak state of the platinum market, as well as the large inventory of platinum group metals held by Russia, necessitates that the South African platinum mining industry must carefully evaluate the benefits and disadvantage of small-scale mining of shallow, open castable ore resources. Until the late 1980's, these resources were ignored due to the metallurgical complexities of treating oxidized ore, as well as the mind set that existed within the South African mining industry which militated against open cast mining in the Bushveld. During the latter part of the 1980's and early 1990

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14

Kleemann, G. J. "The geochemistry and petrology of the roof-rocks of the Bushveld Complex east of Groblersdal." Pretoria : [s.n.], 1985. http://upetd.up.ac.za/thesis/available/etd-11152006-125021.

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15

Van, Wyngaardt Grizelda. "Temporal assessment of atmospheric trace metals in the industrialised western Bushveld Complex / van Wyngaardt G." Thesis, North-West University, 2011. http://hdl.handle.net/10394/6950.

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The presence of trace transition metal species in the atmosphere can be attributed to the emission of particulate matter into the atmosphere by anthropogenic activities, as well as from natural sources. Trace metals emitted into the atmosphere can cause adverse health–related and environmental problems. At present, limited data exists for trace metal concentrations in South Africa. In this investigation, the general aim was to determine the concentrations of trace metals in atmospheric aerosols in the industrialised western Bushveld Igneous Complex, as well as to link the presence of these spe

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16

Mavimbela, Philane Knowledge. "Metamorphism in the contact aureole of the eastern limb of the Bushveld complex, South Africa." Diss., University of Pretoria, 2013. http://hdl.handle.net/2263/41190.

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The 2.06 to 2.054 Ga Bushveld Igneous Complex intruded into the sedimentary rocks of the Transvaal Supergroup and generated an extensive contact metamorphic aureole mainly developed in the upper Pretoria group. The studied samples represent the Silverton Daspoort and Timeball Hill formations and are divisible into garnet bearing hornfels (DY918, DY954 and DY956) and garnet-free staurolite-bearing metapelites (DY916, DY982 and DY987). The garnet-bearing hornfelses marks the garnet zone within the aureole and the garnet formation is controlled by different reactions forming from 490 to 630 0C. O

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17

Otto, Tahnee. "Texture development in titaniferousmagnetites found in Layer 21 in the Bushveld Igneous Complex, South Africa." Diss., University of Pretoria, 2017. http://hdl.handle.net/2263/63292.

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Very limited studies have been conducted on titaniferous-magnetite exsolution textures and the conditions needed for the formation of these textures. Published research surrounding the exsolution textures consider only a particular element of the oxide, or a specific condition. The Upper Zone of the Rustenburg Layered Suite in the Bushveld Igneous Complex boasts 25 magnetite layers. The 21st layer counted from the Main Magnetite layer is called Layer 21, which is the uppermost titaniferous-magnetite layer in the Upper Zone. Uncommon exsolution textures in the titaniferous-magnetite grain

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18

Viljoen, Willemien. "Phase relations in the system Cu-Fe-Ni-S and their application to the slow cooling of PGE matte." Pretoria : [s.n.], 2005. http://upetd.up.ac.za/thesis/available/etd-10132005-100921/.

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19

Manyeruke, Tawanda Darlington. "The petrography and geochemistry of the Platreef on the farm Townlands near Potgietersrus, northern Bushveld Complex." Pretoria : [s.n.], 2005. http://upetd.up.ac.za/thesis/available/etd-04282005-110052/.

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20

Smith, Jennifer Williamina. "The nature and origin of PGE mineralization in the Rooipoort area, northern Bushveld Complex, South Africa." Thesis, University of Leicester, 2014. http://hdl.handle.net/2381/31995.

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The Grasvally Norite-Pyroxenite-Anorthosite (GNPA) member within the northern limb of the Bushveld Complex is a PGE-Ni-Cu mineralized, layered package of mafic cumulates. This magmatic sulfide deposit is developed at the equivalent stratigraphic position to the Platreef, being overlain by Main Zone gabbronorites and in places resting unconformably on metasediments from the Transvaal Supergroup. Parental magmas to the GNPA member were of a ‘hybrid’ composition containing both B1 and B2/B3 type magma components which were strongly crustally contaminated and S saturated at the time of emplacement

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21

Letsoele, Christopher Sbusiso. "The occurrences of ultramafic pegmatites at Dwarsrivier Mine, Lower Critical Zone, Eastern Bushveld Complex, South Africa." Diss., University of Pretoria, 2017. http://hdl.handle.net/2263/63298.

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This study presents a detailed petrological and geochemical investigation of the concordant ultramafic pegmatites of the Lower Critical Zone at Dwarsrivier Mine, in the eastern Bushveld Complex. The pegmatites are coarse-grained and of variable size and mineralogy. They occur within the LG-6 chromitite layer as well as in the silicate rocks of the Rustenburg Layered Suite. Field observations into their occurrence, and their association with the LG-6 chromitite layer, suggest that the pegmatites intrude, deform and disrupt the LG-6 chromitite. The mineralogy of the pegmatites is similar as

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22

Bamisaiye, Oluseyi Adunola. "Visualisation, 3D Modelling and Spatial Analysis of the Rustenburg Layered Suite, Bushveld Igneous Complex, South Africa." Thesis, University of Pretoria, 2015. http://hdl.handle.net/2263/65903.

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Adequate knowledge of the regional subsurface geometry depth relationship between the limbs and distribution of mineral zones within the Rustenburg Layered Suite (RLS) is required for better understanding of the emplacement geometry, distribution of economic mineral zones and structural evolutionary issues. This will lead to improved exploration prospects that could assist in less degradation mining activities and environmental hazard control and management. Incompleteness of surface outcrops and limited availability of seismic data has been a hindrance to this. This research focused on the de

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23

Mwenze, Tshipeng. "The implications of Sr and Nd isotope data on the genesis of the Platreef and associated BMS and PGE mineralisation, Bushveld Igneous Complex, South Africa." University of the Western Cape, 2019. http://hdl.handle.net/11394/6922.

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Philosophiae Doctor - PhD<br>The Platreef is a platinum group elements (PGE) deposit located in the Northern limb of the Bushveld Igneous Complex (BIC). It is a series of mafic and ultramafic sills that are overlain by rocks from the Main Zone (MZ) of the BIC. In comparison to PGE deposits (i.e., Merensky Reef and the UG-2 chromitite) occurring in the Critical Zone (CZ) of the Eastern and Western Limbs of the BIC, which are less than 1 m in thickness, the Platreef is 10 to 400 m in thickness and is comprised of a variety of rocks. PGE mineralisation in the Platreef is not confined to a specifi

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24

Holwell, David. "Roles of magmatism, contamination and hydrothermal processes in the development of Platreef mineralization, Bushveld Complex, South Africa." Thesis, Cardiff University, 2006. http://orca.cf.ac.uk/56160/.

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The Platreef is a highly complex, pyroxenite-hosted Ni-Cu-PGE deposit. It is located at the base of the northern limb of the Bushveld Complex, South Africa, in direct contact with a variety of country rock sediments and Archaean basement. The interaction of the Platreef magma with these diverse country rock lithologies during emplacement had a profound effect on the style and distribution of the mineralization on both regional and local scales. Geometrically, the Platreef was emplaced as a thin, sill-like intrusion, with pre-formed PGE- rich sulfide droplets entrained within the magma. Sulfur

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25

Fischer, Lennart Alexander [Verfasser]. "The Upper Zone of the Bushveld Complex, South Africa: Parental Magma and Crystallization Processes / Lennart Alexander Fischer." Hannover, 2018. http://d-nb.info/1160378800/34.

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26

Fraser, Nicholas Tweedie. "A Metamorphic Study of Pretoria Group Sediments Found at the Dwarsrivier Pass, Bushveld Igneous Complex, South Africa." Diss., University of Pretoria, 2019. http://hdl.handle.net/2263/76009.

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The study takes place in the Dwarsrivier area which lies on the border between Mpumalanga and Limpopo, to the North-West of Lydenberg, at an exposed road cutting. Within the road cutting, there is a unique portion of exposed rock which is light in colour and identified as a calc-silicate. The calc-silicate material is present as a package of rock and is surrounded top and bottom by pyroxenite. The surrounding rock belongs to the Bushveld Igneous Complex (BIC), which is the largest known layered intrusion on the planet and is host to numerous mines. The sample area is within the Critical Zone o

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Fischer, Lennart A. [Verfasser]. "The Upper Zone of the Bushveld Complex, South Africa: Parental Magma and Crystallization Processes / Lennart Alexander Fischer." Hannover, 2018. http://d-nb.info/1160378800/34.

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28

Andrews, Marcelene. "The use of chemostratigraphy and geochemical vectoring as an exploration tool for platinum group metals in the Platreef, Bushveld Igneous Complex, South Africa : a case study on the Tweefontein and Sandsloot farms." University of the Western Cape, 2015. http://hdl.handle.net/11394/5229.

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>Magister Scientiae - MSc<br>The Platreef is known for its complexity and its heterogeneous lithologies, coupled with an unpredictable PGE and BMS mineralisation. The motivation behind this study was to aid mining geologists in targeting mineralisation irrespective of the farm. It is known that the Platreef generally overlies different footwall lithologies at individual farms. Thus, the aims of this study were firstly to investigate the potential of chemostratigraphy by delineating indices indicative of distinctive lithological layers. These indices were then tied to the second aim; which were

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29

Armitage, Paul Edward Blake. "Development of the Platreef in the northern limb of the Bushveld Complex at Sandsloot, Mokopane District, South Africa." Thesis, University of Greenwich, 2011. http://gala.gre.ac.uk/9079/.

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The Platreef is a Ni-Cu-PGE mineralised tabular body at the base of the Rustenburg 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 suggest that the Platreef was emplaced as a broadly horizontal sill-like sheet into the Transvaal Supergroup, but local variations in its thickness and path of intrusion were caused by pre-existing structures in the country r

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Mitchell, Andrew Alexander. "The petrology, mineralogy and geochemistry of the main zone of the Bushveld Complex at Rustenburg Platinum Mines, Union Section." Thesis, Rhodes University, 1988. http://hdl.handle.net/10962/d1001563.

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Union Section of Rustenburg Patinum Mines is situated in the northwestern part of the Bushveld Complex, some twenty kilometres north of the Pilanesberg Alkaline Complex. The mining lease area covers a roughly triangular segment of Lower, Critical and Main Zone rocks, transgressed to the north and south by magnetite-bearing ferrogabbro of the Upper Zone. The Main Zone at Union Section is the focus of this study. The prime source of sample material for the study is the deep exploration borehole SK2, but additional, supplementary samples were collected on surface and underground, as well as from

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Van, Huyssteen Darryn Ashley. "Mineralogical variation in the basal Upper Zone, Bushveld Igneous Complex, South Africa: implications for ore genesis and mineral extraction." Thesis, Rhodes University, 2017. http://hdl.handle.net/10962/5060.

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32

Haikney, Susan Ann. "The nature of olivine-rich cumulate rocks of the lower critical and lower zones of the northwestern Bushveld Complex." Thesis, Rhodes University, 1993. http://hdl.handle.net/10962/d1005592.

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Boreholes NG1 and NG2 were drilled on the farm Nooitgedacht 406 KQ to intersect the lower Critical and lower Zones of the western Bushveld Complex. The aim of this study is to describe the textural features and chemical characteristics of the olivine-bearing rocks in the intersections, as determined by petrographic studies, XRF analysis and microprobe analysis. The olivine-bearing rocks are dunites, harzburgites and olivine pyroxenites. They comprise olivine and orthopyroxene, with minor chromite, clinopyroxene and plagioclase, and their textures vary between adcumulate, mesocumulate and poiki

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33

Wall, Corey James. "Establishing the age and duration of magmatism in large open-system layered intrusions from the high-precision geochronology of the Neoarchean Stillwater Complex and Paleoproterozoic Bushveld Complex." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/58716.

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The Neoarchean Stillwater Complex (Montana, USA) and the Paleoproterozoic Bushveld Complex (South Africa), two of the world’s largest layered intrusions, have been cornerstones for the study of magmatic processes in the Earth’s crust. Mafic layered intrusions are natural laboratories for assessing the emplacement, crystallization, and cooling mechanisms of mantle-derived basaltic magmas. Most layered intrusions do not yet have robust geochronological frameworks from the base to the top of their stratigraphic successions. Zircon is recognized as a relatively common accessory mineral in the Stil

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34

Botha, Michael James. "Petrology and geochemistry of the lower group chromitites and host rocks on the farm Zandspruit 168 JP, Western Bushveld Complex." Thesis, Rhodes University, 1988. http://hdl.handle.net/10962/d1001565.

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The eight Lower Group chromitite layers of the Ruighoek Pyroxenite in the area west of the Pilanesberg (LGl - LG7), on the farm Zandspruit 168 JP, were sampled in borehole cores drilled through the succession. The stratigraphic succession faIls within Cameron's (980) units B to E of the Critical Zone. The lowermost layer of the Lower Group, the LG 1 chromitite, is located some 440 metres below the MG 2 (Middle Group) chromitite layer, above which the first appearance of cumulus plagioclase in the Complex is seen. By convention, this horizon is designated the top of the Ruighoek Pyroxenite in t

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Maier, Wolfgang Derek. "Geochemical and petrological trends in the UG2-Merensky unit interval of the upper critical zone in the Western Bushveld Complex." Thesis, Rhodes University, 1992. http://hdl.handle.net/10962/d1005563.

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One of the most remarkable features of the layered sequence of the Bushveld Complex is its lateral consistency in lithology. This work has established a geochemical and lithological correlation along 170 km of strike of the interval between the UG2 chromitite and the Merensky Reef within the Upper Critical zone of the western limb of the Bushveld Complex. The correlation is based on geochemical investigations of 10 borehole intersections and lithological comparisons of more than 20 borehole intersections around the western lobe of the complex. The basic data presented include 123 whole-rock an

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De, Klerk William Johan. "Petrogenesis of the upper critical zone in the Western Bushveld Complex with emphasis on the UG1 Footwall and Bastard units." Thesis, Rhodes University, 1992. http://hdl.handle.net/10962/d1005598.

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This study is an account of the stratigraphic sequence, the petrography, mineralogy (microprobe investigations of orthopyroxene, clinopyroxene, olivine and plagioclase feldspar), and whole-rock major- and traceelement geochemistry of the silicate cumulates of the Upper Critical Zone in the western Bushveld Complex. Two parts of the study - an investigation of a 350m column incorporating the MG3 and UGI Footwall Units, and a comparison of two additional Upper Critical Zone profiles with a previously compiled profile between the UGI and Bastard Units - are focused on RPM Union Section in the nor

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Edwards, Hunter R. "A multi-isotopic geochemical investigation of the Lower Zone, Bushveld Complex, South Africa: implications for a crustal component for parental magmas." Master's thesis, Faculty of Science, 2020. http://hdl.handle.net/11427/32606.

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The 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) such as elevated  18O values. These geochemical and isotopic systems include major elements, trace elements, highly siderophile elements, oxygen isotopes, 87Sr/86Sr, 143Nd/144Nd, and Os-Os isotopes. Samples come from the Nooitgedacht Borehole 2 (NG2) at Union Section of the western limb of the Bushvel

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Doig, Heather Leslie. "Strike comparison of the compositional variations of the lower group and middle group chromitite seams of the critical zone, Western Bushveld complex." Thesis, Rhodes University, 2000. http://hdl.handle.net/10962/d1005618.

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The variations in the composition, specifically the Cr20 S content and the Cr:Fe ratio, and the morphology of the Lower Group (LG) and Middle Group (MG) chromitite seams of the Critical Zone (CZ) across the western Bushveld Complex, including the Ruighoek and Brits sections, is investigated by means of whole-rock chemical data, both major and trace elements analysis, XRD and electron microprobe data. As a result ofthe paucity of exposed or developed LG1 - LG5 chromitite seams in the western Bushveld Complex, this study is confined to the investigation of the compositional variations of the LG6

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Largatzis, Savvas Anthony. "Petrogenetic implications for the Merensky Reef: a platinum-group element distribution study from wide-reef facies in the western Bushveld Complex, RSA." Thesis, Rhodes University, 2016. http://hdl.handle.net/10962/3167.

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Despite decades of research and its economic importance, the formation of the Merensky Reef still remains controversial. This study reports on the distribution of platinum-group elements within widereef facies in an attempt to identify petrogenetic controls in the formation of the Merensky Reef. Widereef Merensky was sampled from Eland Platinum Mines in the western Bushveld. Macroscopic investigation of the drillcore identified a basal chromitite stringer overlying an anorthositic footwall. The reef comprised a pyroxenite unit while the hangingwall comprised noritic, leuconoritic and anorthosi

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Ramushu, Adam Puleng. "Geochemical and Petrographic Characterization of the Transition Boundary between the MG2 package to MG3 package at Dwarsrivier Chrome Mine, Bushveld Complex, South Africa." University of the Western Cape, 2018. http://hdl.handle.net/11394/6407.

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Magister Scientiae - MSc (Earth Science)<br>This study area is situated within the Eastern Bushveld complex at Dwarsrivier chrome mine, which is approximately 30 km from Steelpoort and 60km from Lydenburg in the Mpumalanga province. The primary aim of the project is to identify the petrological and geochemical characteristics that can be used to distinguish the various rock types of feldspathic pyroxenites, chromitites, anorthosites and chromitite pyroxenites and determine whether the various rock types are from the MG2 package and MG3 package were formed from a single or multiple magma pulses

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Mandende, Hakundwi. "Geochemical and petrographic characterization of platreef pyroxenite Package p1, p2, p3 and p4 units at the akanani prospect area, bushveld Complex, South Africa." University of the Western Cape, 2014. http://hdl.handle.net/11394/4350.

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>Magister Scientiae - MSc<br>This study is focused on the Akanani prospect area, approximately 25 km north-west of the town of Mokopane, Limpopo Province where exploration geologists at the study area have classified the ‘pyroxenitic’ units into P1, P2, P3 and P4 units upward in order of succession with height based on their textures, mineralogy and colour. The primary aim of this study is to distinguish the distinctive geochemical and mineralogical characteristics that can be used to identify each unit (P1 to P4) and in so doing create major geochemical, petrographic and mineralogical variabl

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"A mineralogical and petrographic study of prematoids and layered rocks of the upper critical zone of the western Bushveld Complex, South Africa." Thesis, 2015. http://hdl.handle.net/10210/14325.

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D.Phil.<br>This study which describes rocks of the Upper Critical Zone of the Bushveld Complex is subdivided into three parts. The main rock type of the Upper Critical Zone, the noriteanorthosite, is the subject of the first part. Inclusions in chromite and plagioclase were studied. The inclusions' in chromite were observed at different stages of their formation. The chromite crystals usually overgrow plagioclase, pyroxene and hydrous minerals (biotite, amphibole and clinozoisite) trapping them at grain boundaries or triple junctions of chromite host grains. With 'continuous growth of the host

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Coetzee, Hendrik. "The tectono-chronological evolution of the Bushveld complex." Thesis, 1995. http://hdl.handle.net/10539/22842.

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A dissertation submitted to the Faculty of Science of the University of the Witwatersrand for the degree of Master of Science<br>Detailed high precision geochronological studies have been performed on the 2054 Ma old Bushveld Complex, in an attempt to unravel its tectonic and thermal evolution in the period immediately following intrusion and crystallisation. The geochronological techniques used have been specifically chosen to sample specific temperature episodes in the cooling of the Complex, rather than to necessarily provide an accurate emplacement age, The Bushveld Complex is seen

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Shelembe, Refilwe Pamela. "The Merensky Unit, Lonplats' Mines, western Bushveld Complex." Thesis, 2008. http://hdl.handle.net/10539/5910.

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Wabo, Hervé. "Paleomagnetism of post-Transvaal sill complexes, selected dykes and the Uitkomst Complex - relation to the Bushveld Complex." Thesis, 2014. http://hdl.handle.net/10210/8790.

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Ph.D. (Geology)<br>The Paleoproterozoic (i.e. 2500 Ma to 1600 Ma) apparent polar wander path (APWP) for the Kaapvaal craton (KC) is not well constrained, due to the lack of reliable paleopoles and absence of numerical ages for existing poles. In addition, the duration of emplacement, and timing of remanence acquisition of the Rustenburg Layered Suite (RLS) and other units of the Bushveld Large Igneous Province (LIP) are still unclear. During the present paleomagnetic study, samples were collected from the small intrusions that occur around the RLS and that are believed to be related to the Bus

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Letts, Shawn Andrew. "The palaeomagnetic significance of the Bushveld Complex and related 2 Ga magnetic rocks in ancient continental entities." Thesis, 2008. http://hdl.handle.net/10539/4889.

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The Kaapvaal Craton was the scene of two major magmatic events around 2.0 Ga, namely the Bushveld Complex and the Phalaborwa Complex. Both complexes have been the subject of numerous palaeomagnetic studies during and prior to the 1980s. Despite these studies, systematic inconstancies for emplacement ages, in particular for the Bushveld Complex, have been found between the palaeomagnetic findings and well constrained ages. The greatest concern with the Bushveld Complex results are the large spread in pole positions previously determined for the different zones. This has been interpreted

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Zintwana, Masibulele P. "The petrology and geochemistry of the marginal and lower zones in the Clapham Trough, Eastern Bushveld Complex." Thesis, 2016. http://hdl.handle.net/10539/19360.

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Submitted in fulfilment of the requirements for a Master of Science degree in Geology, in the Department of Geosciences, University of the Witwatersrand, Johannesburg, South Africa. 2015<br>This study undertook to re-evaluate the conventional historic interpretation that accepted the Marginal Zone as representative of the chill phase to the earliest emplacement of Lower Zone magmas. The Clapham Trough preserves a thick sequence of the Marginal Zone rocks, at least 220 m thick. Poor exposures and incomplete stratigraphy of the rock succession that occurs between the floor and the Marginal Zone

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Coomber, Stephen John. "Gravity modelling in the western Bushveld Complex, South Africa, using integrated geophysical data." Thesis, 2009. http://hdl.handle.net/10539/6962.

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A 10 km x 10 km study area in the western Bushveld Complex, south of the Pilanesberg Complex, was selected for testing the inversion of vertical component gravity (Gz) data to determine the geometry of the Bushveld Complex/Transvaal Supergroup contact. This contact has a density contrast of ~0.350 g.cm-3 making it a suitable target for gravity inversion. The resulting 3D gravity model agrees well with the 3D seismic interpretation, indicating that the depths determined from the seismic data are appropriate. The gravity inversion could be extended laterally to investigate regions without seismi

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VanTongeren, Jill A. "The 'Ins' and 'Outs' of the Bushveld Complex Upper Zone." Thesis, 2011. https://doi.org/10.7916/D86M3DTZ.

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This dissertation is an investigation into the geochemical and 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 nature of magmatic differentiation in the uppermost portions of the Bushveld. As a first order, I quantify the chemical composition of the preserved stratigraphy (i.e. the bulk composition) from the geochemical base of the Upper Zone (the Pyrox

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Lum, Jullieta Enone. "Plagioclase compositions in the upper zone of the bushveld complex." Thesis, 2011. http://hdl.handle.net/10539/10270.

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The approximately 2 km thick Upper Zone of the Rustenburg Layered Suite represents a series of differentiated rocks with the appearance of magnetite, olivine and apatite in that order, as cumulus phases in the stratigraphy. Plagioclase is the dominant cumulus mineral throughout the sequence; hence its composition provides a continuous record of differentiation. 126 plagioclase mineral separates have been obtained and analyzed from bore core drilled through the Upper Zone. Anorthite content decreases from An60 close to the base of the Upper Zone to An30 at the top. Six reversals were iden

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