scholarly journals Mylonitization and decomposition of Garnet: Evidence for rapid deformation and entrainment of Mantle Garnet-Harzburgite by Kimberlite Magma, K1 Pipe, Venetia Mine, South Africa

2003 ◽  
Vol 106 (2-3) ◽  
pp. 231-242 ◽  
Author(s):  
J. M. Barton
Keyword(s):  
South Africa ◽  
Kimberlite Magma ◽  
Rapid Deformation

scholarly journals Helium-ratios of rocks and minerals from the diamond pipes of South Africa

1936 ◽  
Vol 154 (882) ◽  
pp. 385-413 ◽  
Keyword(s):  
South Africa ◽  
Igneous Rocks ◽  
Basal Complex ◽  
Kimberlite Magma

It is well known that the diamond pipes of South Africa are occupied by kimberlite in varying states of brecciation and decomposition, together with inclusions of widely different sizes, shapes, and petrographic types. Indeed, so many of the “phenocrysts” of kimberlite are xenocrysts transported from below that it is difficult to determine the composition of the essential kimberlite magma which was responsible for the perforation of the crust and the formation of the pipes. The larger inclusions— commonly referred to as “nodules”—can be conveniently divided into three groups, according to whether they represent: 1—strata now removed by denudation which were penetrated by the uppermost parts of the pipes; 2—formations now exposed in the walls of the pipes opened up by mining, including granites, gneisses, and amphibolites belonging to the Pre-Cambrian basal complex; and 3—metamorphic and igneous rocks brought up from below.

Primary baddeleyite (Zr02) in kimberlite from Benfontein, South Africa

1984 ◽  
Vol 48 (347) ◽  
pp. 257-261 ◽  
Author(s):  
D. E. Scatena-Wachel ◽  
A. P. Jones
Keyword(s):  
South Africa ◽  
Trace Elements ◽  
Electron Microprobe ◽  
Minor Element ◽  
Kimberlite Magma

AbstractBaddeleyite was found during an electron microprobe study of kimberlite from the Benfontein Sills, which are famous for their igneous carbonate and cumulus features. Based on its close textural association with both groundmass and cumulus oxides (spinels, ilmenite, perovskite), the baddeleyite appears to be primary and crystallized directly from the kimberlite magma. The baddeleyite is remarkably pure, with average ZrO2 and HfO2 of 96.4±1.3 and 1.72±0.08 wt. % respectively. Minor element ranges found were: TiO2 0.32–0.80, CaO 0.31–0.80, FeO 0.43–1.31, MgO 0.06–0.24, SiO2 0.04–0.19, Cr2O3 0–0.07, and Al2O3 0–0.10 wt.%. Several additional trace elements were sought (Ce, Cs, Mn, Nb, Nd, Sr, Y, Yb, and U) but were not detected.

Time and Latitude in South Africa

1972 ◽  
Vol 1 ◽  
pp. 27-38
Author(s):  
J. Hers
Keyword(s):  
South Africa ◽  
Cape Town ◽  
Astronomical Observations ◽  
Royal Observatory ◽  
The Republic ◽  
Astronomical Determination ◽  
Limited Accuracy ◽  
Better Than

In South Africa the modern outlook towards time may be said to have started in 1948. Both the two major observatories, The Royal Observatory in Cape Town and the Union Observatory (now known as the Republic Observatory) in Johannesburg had, of course, been involved in the astronomical determination of time almost from their inception, and the Johannesburg Observatory has been responsible for the official time of South Africa since 1908. However the pendulum clocks then in use could not be relied on to provide an accuracy better than about 1/10 second, which was of the same order as that of the astronomical observations. It is doubtful if much use was made of even this limited accuracy outside the two observatories, and although there may – occasionally have been a demand for more accurate time, it was certainly not voiced.

Combining Professional Interests and Travel: People to People Citizen Ambassador Program

2011 ◽  
Vol 1 (2) ◽  
pp. 47-54
Author(s):  
Alex Johnson ◽  
Amanda Hitchins
Keyword(s):  
South Africa ◽  
Health Education ◽  
Communication Disorders ◽  
Social Conditions ◽  
Speech Language Pathologists ◽  
Exchange Program

Abstract This article summarizes a series of trips sponsored by People to People, a professional exchange program. The trips described in this report were led by the first author of this article and include trips to South Africa, Russia, Vietnam and Cambodia, and Israel. Each of these trips included delegations of 25 to 50 speech-language pathologists and audiologists who participated in professional visits to learn of the health, education, and social conditions in each country. Additionally, opportunities to meet with communication disorders professionals, students, and persons with speech, language, or hearing disabilities were included. People to People, partnered with the American Speech-Language-Hearing Association (ASHA), provides a meaningful and interesting way to learn and travel with colleagues.

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