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Mineralogy and petrology of the Townlands iron-rich ultramafic pegmatite

- Phillips, David

  • Authors: Phillips, David
  • Date: 1985 , 2013-09-09
  • Subjects: Ultrabasic rocks -- South African -- Rustenburg , Platinum ores -- South Africa -- Rustenburg , Pegmatites -- South Africa -- Rustenburg , Mines and mineral resources -- South Africa -- Rustenburg
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: vital:5040 , http://hdl.handle.net/10962/d1007617 , Ultrabasic rocks -- South African -- Rustenburg , Platinum ores -- South Africa -- Rustenburg , Pegmatites -- South Africa -- Rustenburg , Mines and mineral resources -- South Africa -- Rustenburg
  • Description: The Townlands iron-rich ultramafic pegmatite is a relatively large pipelike body situated in the western corner of Rustenburg Section, Rustenburg Platinum Mines. It is characterised by a strong negative magnetic signature and transgresses the noritic layered sequence of the upper critical zone of the Bushveld Complex. The layered rocks are downwarped in the vicinity of the pipe and are in sharp contact with the pegmatitic material. The pegmatite varies in composition between dunite and wehrlite, with the marginal zones being more wehrlitic in composition. Olivine (Fo₃₀ - Fo₅₂) and clinopyroxene (Wo₄₅En₃₀Fs₂₅ - Wo₄₅En₃₇Fs₁₈) are the dominant constituents and accessory phases include ilmenite, Ti -magnetite, apatite, amphiboles, chlorite-group minerals, biotite, ilvaite and a host of unusual ore minerals. The Fe-Ti oxides exhibit exsolution textures typically found in slowly cooled igneous rocks and temperatures of formati on are consi dered to be in excess of 800°C. The UG2 chromitite leader layers intersected by borehole TLP.l are enriched in Fe and Ti and exhibit compositions intermediate between chromite and Ti-magnetite. The ore mineral assemblage includes a primary sulphide assemblage consisting of troilite, chalcopyrite, cubanite and pentlandite, and an array of unusual phases formed by late-stage secondary processes. The unusual sulphides mooihoekite and haycockite, that occur in certain parts of the pegmatite, are considered to have formed by partial replacement of the primary assemblage and a possible paragenetic sequence is discussed. Mineral compositions and whole rock geochemical data are consistent with an origin for the pegmatite by crystallization from a fractionated melt. It is suggested that intercumulus fluids, trapped during the crystallization of the noritic layered sequence, accumulated in an area of structural weakness, in response to an increasing overburden pressure and/or tectonic activity. Evidence is also presented that indicates that the Townlands pegmatite may consist of at least two separate, but adjoining pegmatite bodies. , KMBT_363 , Adobe Acrobat 9.54 Paper Capture Plug-in
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  • Date Issued: 1985

Beasts to beer pots - migrant labour and ritual change in Willowvale district, Transkei

- McAllister, P A

  • Authors: McAllister, P A
  • Date: 1985
  • Language: English
  • Type: Article
  • Identifier: vital:6112 , http://hdl.handle.net/10962/d1003832
  • Description: [From the introduction]: Why do some rituals disappear while others continue to be performed? Why do some persist in a relatively unaltered state while others are radically modified? In an article published in 1978 Monica Wilson drew attention to the scarcity of information on this subject, and proceeded to consider possible reasons for the 'resilience' of certain rituals, such as those accompanying initiation and death, and the 'obliteration' of others, such as those concerning the birth of twins. My concern in this paper is with the persistence and radical modification of a Gcaleka ritual called umhlinzeko or umsindleko, performed in celebration of the return of a migrant worker to his rural home. The earlier form of the ritual (umhlinzeko) is described and this is followed by an outline of the present-day form (umsindleko). The bulk of the paper is taken up with an attempt to explain why the one form gave way to another. In this respect the analysis concentrates on the relationship between the two forms and their socio-economic contexts, and tries to relate the changes in the form and meaning of the ritual to the changing economic and political circumstances affecting the Gcaleka and other Xhosa-speakers.
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  • Date Issued: 1985

Mtsitso 4

- Venancio Mbande and his Timbila orchestra, Tracey, Andrew T N

Title not specified

- Venancio Mbande, Tracey, Andrew T N

Vice-Chancellor's message

- Henderson, Derek Scott

  • Authors: Henderson, Derek Scott
  • Date: 1985
  • Language: English
  • Type: Text
  • Identifier: vital:7514 , http://hdl.handle.net/10962/d1018391
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  • Date Issued: 1985

The playing characteristics of American trombones and German-system bassoons

- Galloway, David John

  • Authors: Galloway, David John
  • Date: 1985
  • Subjects: Trombone Bassoon
  • Language: English
  • Type: Thesis , Masters , MMus
  • Identifier: vital:2661 , http://hdl.handle.net/10962/d1004508
  • Description: Preface: South Africa, a country renowned for its mineral wealth has, perhaps manufacturing paradoxically, no musical wind instrument industry of its own as yet. Thus performers, educators and students alike have either to travel to Europe or America to select an instrument, or to import an expensive instrument that may be both unseen and untried, as very few musical instrument dealers are prepared to outlay capital on stock which appeals to a decided minority of their potential customers. Alternately, a purchase of a particular make or model can be made on the basis of a hearsay opinion; at best, the opportunity for first-hand assessment is minimal. It is the trombone of U. S.A. manufacture and the German bassoon which represent the current state of their respective manufacturing arts, and the yardsticks by which their many imitator's efforts are measured. One of the main aims of this Thesis is to describe in objective terms what has been experienced subjectively over the years of involvement with these instruments -- arguably a task similar to that of the art critic, but operating within more positively defined parameters namely, what works for the student and professional. , and what doesn't. The candidate claims credit for introducing the large-bore Bb/F trombone to South Africa in 1961, following with the introduction of the ·first double-valve bass trombone in 1965, and the first in 1979. The first Schreiber bassoons The advantages and trombone and other bassoon and other such instrument with in-line rotors of the new 5000 series larger-bore was likewise introduced in 1981. pitfalls of " doubling" between the wind instruments , and between the winds, are disc ussed at length in the final section of the Thesis.
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  • Date Issued: 1985

Rhodes University 1985 Graduation Ceremonies Address

- Henderson, Derek Scott

  • Authors: Henderson, Derek Scott
  • Date: 1985
  • Language: English
  • Type: text
  • Identifier: vital:7487 , http://hdl.handle.net/10962/d1018364
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  • Date Issued: 1985

Gerard Manley Hopkins's poetic art as "current language heightened" : (with reference to selected sonnets and in the light of contemporary stylistic theory)

- McDermott, Lydia Eva

  • Authors: McDermott, Lydia Eva
  • Date: 1985
  • Subjects: Hopkins, Gerard Manley, 1844-1889 , English poetry -- 19th century -- History and criticism
  • Language: English
  • Type: text , Thesis , Masters , MA
  • Identifier: vital:2337 , http://hdl.handle.net/10962/d1002019
  • Description: The aim of this thesis is twofold: To examine Hopkins's writings on poetics and to relate these to modern theories of poetic stylistics; and to show, through an examination of two sets of Hopkins sonnets, the ways in which Hopkins's writings on language and poetics are reflected in his verse (Introductory outline, p. 5)
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  • Date Issued: 1985

Kuhauzela

- Venancio Mbande and his group of 25 men, Tracey, Andrew T N

Mtsitso 6

- Shalati, Tracey, Andrew T N

Mtsitso 5

- Shalati, Tracey, Andrew T N

Mtsitso 4

- Venancio Mbande and his group of 25 men, Tracey, Andrew T N

Mtsitso 1

- Venancio Mbande and his group of 25 men, Tracey, Andrew T N

Address to new students, 11 February 1985

- Henderson, Derek Scott

  • Authors: Henderson, Derek Scott
  • Date: 1985
  • Language: English
  • Type: text
  • Identifier: vital:7485 , http://hdl.handle.net/10962/d1018362
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  • Date Issued: 1985

The mineralogy, petrology, and origin of the Merensky cyclic unit in the western Bushveld Complex

- Kruger, F J, Marsh, Julian S

  • Authors: Kruger, F J , Marsh, Julian S
  • Date: 1985
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/136024 , vital:37329 , https://doi.org/10.2113/gsecongeo.80.4.958
  • Description: The Merensky cyclic unit of the Bushveld Complex represents the first products to crystallize after the influx and mixing of a large new batch of magma in the chamber. Excluding the Merensky pegmatoid, the Merensky cyclic unit grades upward from an orthopyroxenite at the base, through norite to anorthosite at the top of the sequence. It is followed by the very similar Bastard cyclic unit.
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  • Date Issued: 1985

Chibhudhu 1985

- Venancio Mbande and his group of 25, Tracey, Andrew T N

Mchuyo 1985

- Venancio Mbande and his group of 25, Tracey, Andrew T N

Mtsitso 6

- Venancio Mbande and his group of 25 men, Tracey, Andrew T N

Montagu middagskof

- University of Cape Town, Centre for Extra-Mural Studies

  • Authors: University of Cape Town, Centre for Extra-Mural Studies
  • Date: 1985
  • Subjects: Readers for new literates , Afrikaans language -- Readers
  • Language: Afrikaans
  • Type: text , book
  • Identifier: http://hdl.handle.net/10962/74888 , vital:30351
  • Description: Op Saterdag 5 Oktober 1985 het 50 mense indie saal van die Montagu/Ashton-Gemeenskaosdiens bymekaargekom. Almal het te doen met die Lees- en-Skryfprojek : daar was 21 leerders en 15 groepleiers uit die dorp en wyk; La-La, Dawie en ander personeel en vriende van die MAG; en 5 mense van die Kaap wat die afge- lope maande gehelp het met die projek. Die leerders en groepleiers het die stories geskryf wat in hierdie boek verskyn.
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  • Date Issued: 1985

Kuhauzela

- Venancio Mbande and his group of 25 men, Tracey, Andrew T N

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