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5 edition of Aspects of the geochemistry of the acid phase of the Central and Eastern Bushveld Complex found in the catalog.

Aspects of the geochemistry of the acid phase of the Central and Eastern Bushveld Complex

D. H. Lenthall

Aspects of the geochemistry of the acid phase of the Central and Eastern Bushveld Complex

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  • 26 Currently reading

Published by University of the Witwatersrand in Johannesburg .
Written in English

    Places:
  • Bushveld Complex (South Africa),
  • South Africa,
  • Transvaal.
    • Subjects:
    • Granite -- South Africa -- Transvaal.,
    • Geochemistry -- South Africa -- Transvaal.,
    • Bushveld Complex (South Africa)

    • Edition Notes

      Bibliography: leaf 20.

      Statementby D. H. Lenthall.
      SeriesInformation circular - Economic Geology Research Unit ;, no. 99, Information circular (University of the Witwatersrand. Economic Geology Research Unit) ;, no. 99.
      Classifications
      LC ClassificationsQE325 .J6 no. 99, QE462.G7 .J6 no. 99
      The Physical Object
      Pagination20 leaves :
      Number of Pages20
      ID Numbers
      Open LibraryOL4283774M
      ISBN 100854943595
      LC Control Number78310234
      OCLC/WorldCa4489970

      The Platreef is a platinum group elements and base metal enriched mafic/ultramafic layer situated along the base of the northern limb of the Bushveld Complex. The present study contains a detailed petrographic and geochemical investigation of a borehole core intersection through the Platreef on the farm Townlands. At this locality, the Platreef rests on metasedimentary rocks of the Silverton. The Platreef, located in the northern limb of the Bushveld Complex in South Africa, is a world-class Ni-Cu-PGE deposit. The complexity of the deposit has meant that despite the numerous studies, developing an accepted genetic model to account for the variations observed has been difficult. The layered nature of the Bushveld Complex lends itself to the use of density as a stratigraphic tool. Densities were calculated for samples from borehole GC10 in the southwest Bushveld Complex and for samples from borehole ZG74 in the northeast Bushveld Complex. The density was determined firstly by weighing the sample. Mafic dykes in the Bushveld Complex 37 Figure 1. (a) Regional aeromagnetic map over the eastern Bushveld Complex and surrounding area, indicating locations of palaeomagnetic drill sites (1 to 5). The location of the high-resolution survey in (c) is indicated with white outlines and covers sites 1, 4 and 5.

      Shear wave velocity structure of the Bushveld Complex, South Africa Eldridge M. Kgaswane a,c,⁎, Andrew A. Nyblade b, Raymond J. Durrheim c,e, Jordi Julià f, Paul H.G.M. Dirks c,d, Susan J. Webb c a Council for Geoscience, Pretoria Road, Private Bag X, Pretoria , South Africa b Department of Geosciences, Pennsylvania State University, University Park, PA, USA.


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Aspects of the geochemistry of the acid phase of the Central and Eastern Bushveld Complex by D. H. Lenthall Download PDF EPUB FB2

Add tags for "Aspects of the geochemistry of the acid phase of the Central and Eastern Bushveld Complex". Be the first. The Bushveld Igneous Complex (BIC) is the largest layered igneous intrusion within the Earth's crust.

It has been tilted and eroded forming the outcrops around what appears to be the edge of a great geological basin: the Transvaal is approximately 2 billion years old and is divided into four different limbs: the northern, southern, eastern, and western limbs.

This is the preface to a special issue on various aspects of the Bushveld complex, Transvaal basin, South Africa. The geology is described briefly (assuming familiarity on the part of the reader. The Bushveld Complex: Introduction and Review G. VON GRUENEWALDT, MARTIN R.

SHARPE, AND C. HATTON Institute for Geological Research on the Bushveld Complex, University of. INTRODUCTION. The effects of volatile components in igneous systems are well documented. During partial melting, the addition of water lowers the solidus of the source rock (e.g.

Burnham & Davis, ), which can change both the major and trace element chemistry of the partial melt (e.g. Hickey & Frey, ; Iwanori, ).Further, volatile elements can alter the anhydrous Cited by: The Bushveld Complex The Bushveld Complex is the world’s largest layered intrusion, and because of its unique char- acter most other layered intrusions are compared with it.

The Bushveld Complex, as exposed at cur- rent levels of erosion, consists eastern, western and northern limbs, see Figure 1, File Size: KB. A vast composite body of plutonic and volcanic rocks in the central part of the Transvaal, the Bushveld igneous complex includes the platinum reef worked by Rustenburg Platinum Mines Limited and constituting the world’s greatest reserve of the platinum metals.

This article describes the geological and economic aspects of this unusually interesting formation. The chromite deposits of the eastern Bushveld Complex occur in the Critical Zone, a layered pile consisting mainly of pyroxenite, norite, and anorthosite, with minor gabbro, dunite, and harzburgite.

With probable reserves in excess of one billion tons, the deposits are among the major mineral resources of. The Bushveld complex crops out in the Northern part of South Africa, in the provinces of North-West, Limpopo and Mpumalanga. It is about km wide and km thick; its total surface is close to 55, km2.

However, a large part of the complex is actually covered by younger deposits, and the actual outcrop of mafic rocks has a complex File Size: 1MB. The floor of this part of the Bushveld Complex is undulous with two approximately north-south-trending structures composed of metasedimentary rocks flanking the lower and critical zones; the floor is confined to a north-south-aligned, kidney-shaped by: The last magmatic event of the Bushveld Complex is dated at ± 48 m.y (Rb-Sr whole rock age) (Walraven et aI., ) and is represented by the Lebowa Granite, which was emplaced at, or close to, the contact between the Rustenburg Layered Suite and the acid.

The northern lobe of the Bushveld Complex is currently a highly active area for platinum-group element (PGE) exploration. This lobe hosts the Platreef, a 10–m thick package of PGE-rich pyroxenites and gabbros, that crops out along the base of the lobe to the north of Mokopane (formerly Potgietersrus) and is amenable to large-scale open pit mining along some portions of its by: layers of the central Critical Zone in the eastern ‘lobe’ of the Bushveld Complex south of Steelpoort.

Figure 1. Geological and locality map of Tweefon- tein Mine in the Critical Zone of the eastern. File Size: KB. The geochemistry of the Bushveld granites in the Potgietersrus tin-field. Precambrian Res., 5: An area of km2 was selected for a pilot-study of the geochemical characteristics of the Bushveld granites in the Potgietersrus tin-field.

Two hundred and sixty Cited by: eastern limb of the Bushveld Complex. It is peripheral to the main Complex and lies within a structurally complex setting to the south-west of the Mineral Range area. The ultramafic-mafic rocks strike approximately east-west and lie to the southeast of the Dennilton Dome and to.

Geological Setting Introduction to the Bushveld Complex, South Africa The Bushveld Complex, of Palaeoproterozoic age, is located in the central northeast portion of the Kaapvaal Craton in southern Africa, and has an estimated total area of 65 km2 (Hunter, ).

File Size: 4MB. Subdivision of the Bushveld Complex The Bushveld Complex can be subdivided into five compartments (Fig. 3): (1) a far western or Nietverdiend compartment, (2) a western com- partment, (3) the Villa Nora-Potgietersrust com- partment, (4) the eastern compartment, and (5) the covered Bethal compartment, and in addition the Molopo Farms Complex in Cited by:   This whole rock and silicate mineral study focuses on the genesis of the Merensky reef sequence, as well as the footwall and hanging wall norites at an area of Rustenburg Platinum Mines in a demonstrably normal (undisturbed) environment.

Continuous sampling provides major and trace element variations and mineral compositions and allows an evaluation of the post- liquidus processes which Cited by:   Pre 7 Eastern Limb of the Bushveld Complex. The Ga–old Bushveld Complex is situated in the north-eastern part of South Africa.

Three distinct groups of rocks make up the Complex but this excursion is directed primarily at the layered ultramafic-mafic rocks. We will, however, briefly examine the roof rocks, the older felsite and younger.

The Bushveld Complex underlies an area of ab square km (20, square miles); and the Great Dyke of Zimbabwe, another layered complex, has been traced for more than km ( miles).

Anorthosite is also found on the lunar surface. In Precambrian: Layered igneous intrusions. and most famous is the Bushveld Complex in South Africa. The group of 32 geologists representing approximately a dozen countries and six continents commenced the six-day field excursion to the Eastern Limb of the Bushveld Complex on 22 nd August.

Despite blustery conditions and a dust-laden sky for the first two days, the remaining four days yielded near perfect field conditions. The central sector (Scoon & Teigler, ) of the eastern Bushveld Complex is a broad NW–SE-trending arcuate distribution of mafic and ultramafic rock units extending for some 80 km (Fig.

1 b). It has the best preserved Marginal Zone and Lower Zone rocks but, overall, exposure is selective of more resistant by: Figure 1: General geological map of the Bushveld Complex (adapted from Van der Merwe and Cawthorn ).

The main limbs of the complex are shown; Western Limb, Eastern Limb and Northern Limb. The location of the De Wildt project, east of the Brits Graben is shown. The Geology of the Bushveld Complex on the Sekhukhune Plateau, Eastern Transvaal Alan Gerald Marlow University of Pretoria, - Bushveld Complex (South Africa) - pages.

the Critical Zone of the Eastern Bushveld Complex has been under way at the University of Wisconsin for some years. Both chromite and associated sili-cates in chromite-rich and chromite-poor rocks have been studied.

This paper reports on the composition of chromite in the Critical Zone of the central sector of the Eastern Complex, as Cited by: 1. Geochemistry and mineralogy of the Platreef and ‘‘Critical Zone’’ of the northern lobe of the Bushveld Complex, South Africa: implications for Bushveld stratigraphy and the development covery of the Merensky Reef in the eastern Bushveld in and was systematically explored and mined until.

in the central Transvaal. Elliptical in plan, While most investigations inshield areas are concerned with acid pluronic rocks, the Bushveld Complex offers an opporrunity to examine landforms deriving from lithologies which are rarely encountered at outcrop. If, originally, the objectives ofthe field in the eastern Bushveld Complex is.

Eastern limb of the Bushveld Complex, South Africa: Geology and Geomorphology of a Uniquely Layered Ultramafic-mafic Intrusion. PDF version. GEOSCIENCE IN THE ECONOMY. Mineral Deposits and Ore Forming Processes.

T - Processes governing ore formation in the Bushveld Complex and other mafic and ultramafic magmatic systems (IAGOD-CODMUR.

The Bushveld Complex, a product of interaction among magmas derived from a mantle plume C.J. Hatton Anglo American Research Laboratories (Pty) Ltd., P.O. BoxCrown Mines,South Africa Chromite and PGE-enriched layers in the Bushveld are modelled on a process of the cooling of resident lower zone magma by sub.

The Bushveld Complex is part of the massive Bushveld Igneous Province that also includes voluminous ferroan granites and other felsic rocks, all of similar age of ≈ Ga. The enormous extent of the Bushveld Complex ( × km if a continuous sheet) belies the fact that it is generally poorly exposed, with the exception that parts of the File Size: 3MB.

Western Central Bushveld Bioregion Geographic location The study area is located within the vast Savanna biome, which covers large parts of southern Africa and comprises the western portion of the Central Bushveld Bioregion (figure ).

Winterbach et al. () define the Central Bushveld as the bushveld of the North-West and. Bushveld Complex. The mines are extracting the PGE minerals, which comprise Platinum, Palladium, Rhodium and Gold, together with base metals Copper and Nickel.

This article focuses on the description of the aquifer systems associated with the Bushveld Complex’s mafic and ultramafic rocks and attempts to characterise the shallow.

Geochemistry of the Central and Western Structures method was selected. As such, there can still be slight variations in results from repeated runs of the tool due to the randomness in initialisation. The Grouping Analysis tool can statistically suggest the optimal number of groups, based on the highest pseudo F- statistics.

Steelpoort fault of the eastern Bushveld Complex – Petrogenetic implications C. Gauert 1, J.J. Beukes geochemistry during decompression and advanced crystallization.

• The site of investigation is the. cumulus phase (S - poor) after Tredoux et al. Major and trace element geochemistry of the Platreef on the farm Townlands, northern Bushveld Complex tl > most of the eastern and westerti litnbs of the lUishveld Complex are conslittttetl by relatively complex or is separated from the latter by a few lO's of meters.

Secondly, the mineralized intet^'al is much. Controls on polymetallic mineralisation in the acid phase of the bushveld complex: a case study from the area North of Bronkhorstspruit, South Africa.

Imprint Johannesburg: University of the Witwatersrand, Physical description 27 p. Series Information circular (University of the Witwatersrand.

Complex has been suggested to be genetically related to the Ma, Bushveld Igneous Complex (BIC; de Waal and Gauert, ), also hosted within the Kaapvaal craton by Transvaal Supergroup sediments (Figure ). The Bushveld Igneous Complex is comprised of a Western- Eastern- Northern. ultramafic phase of the intrusive Bushveld Complex.

The Lebowa Granite Suite, the granitic phase of the Bushveld Complex, intrudes the Rooiberg Group in other areas. Most of the isotopic age dates acquired for samples of the Rooiberg Group and the Bushveld Complex range from ±2 to ±48 Ma (e.g.; Walraven et al.

Iwtitute for Geological Research on the Bushveld Complac, University of Pretoria, Hillcrest, PretoriaRepublic of South Africa ABSTRAcT The uppermost [email protected] m of the upper zone of the western Bushveld Complex at Bierkraal were investigated by whole-rock geochemistry and mineral chernistry of.

new book. Yet it retains a distinctly French flavor, particularly in the way many subjects are addressed via mathematical description. This approach is entirely normal for a student of the French Ecole Normale or a French university, but it will surprise many American geochemistry as a quantitative science, this book is definitely for Size: KB.

Bushveld Complex since has allowed vertical and lateral variations of the Merensky Cyclic Unit to be studied in detail in a variety of reef types over a wide area and using identical sampling techniques and analytical procedures.

Changes in thickness, structure and textures are related to the style and distributions of PGE.`a] complete and authoritative geochemistry desk reference.' Environmental Science and Technology, () `This Encyclopedia of Geochemistry has been painstakingly put together over a number of years, and the care and attention to detail has been very worthwhile.

Here is a volume that exceptionally compiles basic information, and the details of commonly used techniques, with essays of Format: Hardcover.Characteristics of Cr-Spinel and Whole Rock Geochemistry of the Nuasahi Igneous Complex, Orissa, India Sisir K.

Mondal1, Michael D. Glascock2 and Edward. M. Ripley1 1Department of Geological Sciences, Indiana University, Bloomington, Indiana 2Research Reactor Center, University of Missouri, Columbia, Missouri e-mail: [email protected], [email protected]@edu, File Size: KB.