Faculty of Science: Recent submissions
Now showing items 261-280 of 381
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Basement control on dyke distribution in Large Igneous Provinces: Case study of the Karoo triple junction
(Elsevier www.elsevier.com/locate/epsl, 2006)Continental flood basalts consist of vast quantities of lava, sills and giant dyke swarms that are associated with continental break-up. The commonly radiating geometry of dyke swarms in these provinces is generally ... -
Mesoproterozoic rocks of Namibia and their plate tectonic setting
(Elsevier www.elsevier.com/locate/jafrearsci, 2006)Two main Mesoproterozoic provinces occur in southern Namibia: (1) The high-grade Namaqua Metamorphic Complex (NMC) composed of a supracrustal sedimentary succession and interpreted as a passive margin sequence in the west ... -
An overview of the geology and major ore deposits of Central Africa: Explanatory note for the 1:4,000,000 map ‘‘Geology and major ore deposits of Central Africa’’
(Elsevier www.elsevier.com/locate/jafrearsci, 2006)This paper is prepared within the frameworks of IGCP Project 470 and the associated BRGM scientific project ‘‘Africa 1999–2004’’ to accompany the 1:4,000,000 scale map ‘‘Geology and major ore deposits of Central Africa, ... -
The Karoo triple junction questioned: evidence from Jurassic and Proterozoic 40Ar/39Ar ages and geochemistry of the giant Okavango dyke swarm (Botswana)
(Elservier www.elsevier.com/locate/epsl, 2004)The lower Jurassic Karoo–Ferrar magmatism represents one of the most important Phanerozoic continental flood basalt (CFB) provinces. The Karoo CFB province is dominated by tholeiitic traps and apparently radiating giant ... -
Cryptic indicators of provenance from the geochemistry of the Okavango Delta sediments, Botswana
(Elsevier www.elsevier.com/locate/sedgeo, 2005)The siliciclastic sediments of the Okavango inland Delta of northwest Botswana have a modal composition of quartz arenites and result from a complex history, including transport by river and deposition in a nascent rift ... -
Major and trace element geochemistry of plutonic rocks from Francistown, NE Botswana: evidence for a Neoarchaean continental active margin in the Zimbabwe craton
(Elsevier www.elsevier.com/locate/lithos, 2003)The Neoarchaean Tati granite–greenstone terrane occurs within the southwestern part of the Zimbabwe craton in NE Botswana. It comprises 10 intrusive bodies forming part of three distinct plutonic suites: (1) an earlier ... -
Sediment-hosted Zn–Pb–Cu deposits in the Central African Copperbelt
(Elsevier www.elsevier.com/locate/oregeorev, 2009)Stratabound epigenetic sulphide Zn–Pb–Cu ore deposits of the Central African Copperbelt in the Democratic Republic of Congo and Zambia are mostly hosted in deformed shallow marine platform carbonates and associated ... -
Shallow seismic refraction and magnetic studies at Lake Ngami, The Okavango Delta, Northwest Botswana
(Elsevier www.elsevier.com/locate/jafrearsci, 2007)A seismic refraction analysis was carried out on data acquired on an 8.5 km profile at Lake Ngami, NW Botswana, to determine the structure and stratigraphy underlying the lake. The seismic spread comprised a 48-channel ... -
Ages of detrital zircon grains from Neoproterozoic siliciclastic rocks in the Shakawe area: implications for the evolution of Proterozoic crust in northern Botswana
(Geological Society of South Africa. http://sajg.geoscienceworld.org/, 2000-06)The Precambrian rocks of northern Botswana comprise poorly exposed igneous complexes, high-grade metamorphic rocks, as well as sedimentary sequences including mainly siliciclastic and carbonate rocks. New U-Pb SHRIMP data ... -
Photonics and photochemical stability of aromatic molecules, family related in -structure but different in planarity, rigidity and molecule symmetry
(Elsevier Science Ltd. www.elsevier.com/locate/jphotochem, 2008)Intramolecular processes and fluorescence properties of 32 specially chosen aromatic molecules, different in degrees of planarity and rigidity, but family related in -structure are experimentally and theoretically (using ... -
The influence of the Tbetta level upon fluorescence and laser properties of aromatic compounds
(Elsevier Science Ltd. www.elsevier.com/locate/saa, 2004)The fluorescence and laser properties of seven specially chosen aromatic compounds are studied at 293 ◦C. The quantum yield of fluorescence, γ, decay times, τf , of the deaerated and non-deaerated solutions are measured. ... -
Urban environmental management in Botswana:towards a theoretical explanation of public policy failure
(Springer http://www.springerlink.com/index/05CM7XY4DJGUEUQL.pdf, 2001)For the last three and half decades, Botswana has been widely acclaimed to be one of sub-Saharan Africa's longest and most stable liberal democracies, coupled with and sustained by a growing economy. One of the major ... -
The effects of the water management framework and the role of domestic consumers on urban water conservation in Botswana
(Routledge http://dx.doi.org/10.1080/02508060802475415, 2008)This article examines the adverse effects of a fragmented water management framework and the role of domestic water users on water conservation in Gaborone, the rapidly growing capital city of Botswana. There was a major ... -
Soil heavy metal concentration patterns at two speed zones along the Gaborone-Tlokweng border post highway, Southeast Botswana
(JASEM http://www.ajol.info/index.php/jasem/article/view/43693/27216, 2006-06)Since 1988 Botswana has been experiencing an unprecedented increase in vehicular traffic which is suspected to be having contamination effects on soils along heavily used roads in the country. This study aimed at understanding ... -
Magnetic hysteresis properties of interacting and noninteracting micron-sized magnetite produced by electron beam lithography
(AGU and the Geochemical Society. http://www.agu.org/journals/gc/index.shtml, 2006)The magnetic hysteresis properties for well-defined micron-sized magnetite samples produced by electron beam lithography (EBL) are presented. In addition to measuring standard hysteresis parameters, first-order reversal ... -
Understanding Nickel Thin Film crystallization using X-Ray Diffractometry
(Bioline International. http://www.ajol.info/journal_index.php?jid=90, 2007-06)Normal, helical and zigzag deposited Ni films were produced by letting a vapour stream of source material impinge on Corning 1737 glass substrates at oblique incidence while rotating the substrate during deposition. Films ... -
Fire and its influence on microbial community structure and soil biochemical properties in the Okavango Delta, Botswana
(Academic Journals. http://www.academicjournals.org/SRE, 2007)The influence of wild fires on microbial community structure, soil organic matter, sulphur oxidising and nitrifying microbial populations in the floodplains of the Okavango Delta of Botswana was assessed. Microbial ... -
Low-temperature magnetic properties of magnetite
(American Geophysical Union. http://www.agu.org/journals/jd/, 200)Although several studies have recommended removal of secondary components of magnetic remanence by zero-field cycling from room temperature to a temperature much lower than the low temperature transition for magnetite ... -
Gaboroquinones A and B and 4'-O-demethylknipholone-4'-O-β-D-glucopyranoside, phenylanthraquinones from the roots of Bulbine frutescens
(American Chemical Society. http://pubs.acs.org/jnp/, 2002)The novel phenylanthraquinones 4'-O-demethylknipholone-4'-O-β-D-glucopyranoside (2) and gaboroquinones A (3) and B (4) were isolated from the African medicinal plant Bulbine frutescens. Biaryl 2 represents the first ... -
Progress in the chemistry of marketed traditionally used plants of Ethiopia
(Chemical Society of Ethiopia. http://www.aau.edu.et/faculties/sc/CSE/home.html, 1996)