A laterally extensive geochemical discontinuity in the subcontinental Gondwana Lithosphere
- Authors: Erlank, Anthony J , Duncan, Andrew R , Marsh, Julian S , Sweeney, R J , Hawkesworth, C J , Milner, Simon C , Miller, R McG , Rogers, N W
- Date: 1988
- Language: English
- Type: text , abstracts
- Identifier: http://hdl.handle.net/10962/131678 , vital:36710
- Description: Cox et al. (1967) first delineated the existence of two major geochemical provinces in the Karoo basalts of southern Africa. Tholeiitic basalts in Zimbabwe are highly enriched in incompatible trace elements and constitute the "northern province". In contrast, basalts from Lesotho and from the southern segment of the Lebombo monocline have lower or “normal” abundances of these elements and were regarded as a "southern province'. Recent work has established that this change in composition takes place relatively rapidly in the Central Lebombo.
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- Date Issued: 1988
Distribution and petrogenesis of the basic rocks of the Etendeka Formation of northwestern Namibia
- Authors: Marsh, Julian S , Duncan, Andrew R , Milner, Simon C , Erlank, Anthony J
- Date: 1988
- Language: English
- Type: text , abstracts
- Identifier: http://hdl.handle.net/10962/131667 , vital:36709
- Description: The igneous rocks which comprise the Etendeka Formation in northwestern Namibia cover an area of 78 000 km² and consist dominantly of interbedded basalts and quartz latites, with minor latites. They are spatially associated with, and intruded by, two suites of dolerites. The rocks of the Etendeka Formation are included in the Karoo Igneous Province but differ from most other Karoo volcanics with respect to their younger age (Cretaceous) and aspects of their mineralogy and geochemistry.
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- Date Issued: 1988
The late Archaean Dominion Group, South Africa: petrogenesis of flood-type basalts and their mantle sources
- Authors: Marsh, Julian S , Rogers, N W , Bowen, M P , Bowen, T B
- Date: 1988
- Language: English
- Type: text , abstracts
- Identifier: http://hdl.handle.net/10962/131690 , vital:36721
- Description: The Dominion group has an age of 2.7 - 2.8 Ga and is the earliest of the cover sequences overlying the granite greenstone terrane in the western part of the Archaean Kaapvaal Craton, southern Africa. The Dominion group is largely built of volcanic rocks and is preserved over an area of 15,000 km² with a maximum thickness of 2.7 km.
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- Date Issued: 1988
Work in Progress Issue no.54 - COSATU Congress
- Authors: WIP
- Date: July 1988
- Subjects: WIP
- Language: English
- Type: text
- Identifier: http://hdl.handle.net/10962/111453 , vital:33460
- Description: If Home Affairs Minister Stoffel Botha did not have so much power, his comments on the media would be funny. A man who seriously suggests that South Africa's progressive media, already restricted in what it may publish by some 100 statutes and reams of often unintelligible emergency restrictions, furthers 'fear, hatred, intimidation, murder, mutilation and other similar evils' is difficult to take seriously.But his powers to close publications are serious. His notion of 'media terrorists' - 'people who are in a position to provide publicity for the revolutionaries' - is easier to understand. For Stoffel Botha is a leader of a political party which has, for 40 years, systematically undermined the most elementary aspects of democracy. He is not really expected to know much about the media's duty and right to inform its readership. Work In Progress remains under threat from state sources which believe that publication of information they do not like is 'media terrorism'. But if its political survival is to some extent out of WIP's hands, its publishers can at least secure its economic future. Readers will have noticed that Work In Progress is being printed on a lighter paper than before. This makes the publication somewhat thinner, although a changed design format allows for more copy per page. Work In Progress has not raised its selling price since January 1985. Indeed, the cost for some categories of readers has actually dropped. Subscriptions were last increased at the end of 1986 - and then only marginally. Inflation has hit all facets of publishing - paper, printing and distribution costs have all jumped each year. Only WIP's ever-growing circulation has enabled its cover price to remain constant. Recently, however, something had to change. Rather than increasing cover price or subscription costs, the publishers decided to print on a cheaper and thinner paper, while upgrading cover quality. Hence a slimmer Work In Progress - but no price increase. Also new in this edition is the inclusion of a number of short briefs. This is a section the editors hope to expand and improve in the future - Stoffel Botha and his 'media hit-men' notwithstanding!
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- Date Issued: July 1988