Sökning: "minerals africa"
Visar resultat 1 - 5 av 10 avhandlingar innehållade orden minerals africa.
1. Mining Booms in Africa and Local Welfare Effects: Labor Markets, Women’s Empowerment and Criminality
Sammanfattning : The role that extractive industries can play in processes of economic development is frequently described as, at best non-existent, or at worst, persistently negative. Extractive industries, while focusing on unearthing large sub-soil wealth, are sometimes linked to adverse political and macroeconomic outcomes in developing countries. LÄS MER
2. Mesoproterozoic crustal evolution in Southern Africa
Sammanfattning : The objects of this thesis were to use geochronology to investigate crustal evolution of part of Southern Africa that formed during a global event, resulting in the ~1 Ga supercontinent Rodinia. The timing of assembly by continent-continent collisions and the position of the individual continental blocks of this ancient landmass is still largely unknown. LÄS MER
3. Genetic diversity and nutritional content of sorghum [Sorghum bicolor (L.) Moench] accessions from Southern Africa
Sammanfattning : Sorghum [Sorghum bicolor (L.) Moench] is an important cereal crop in semi-arid regions of the world especially in Africa, South Asia and China. It is an important food and fodder crop in the semi-arid tropics (SAT) of Africa, where it is used for making different kinds of food. LÄS MER
4. U-Pb baddeleyite geochronology of Precambrian mafic dyke swarms and complexes in southern Africa - regional scale extensional events and the origin of the Bushveld Complex
Sammanfattning : Dolerite dykes are formed when iron- and magnesium-rich (mafic) mantle-derived magmas ascend through the lithosphere (upper part of the mantle) and crystallize as ‘hydro-fractures’ within the crust. Dykes may exist in great numbers to form dyke swarms (linear or radiating), which can be linked to time periods of continental break-up, or attempted break-up events, associated with voluminous volcanism. LÄS MER
5. Hydrogeochemistry of arsenic, fluoride, and other trace elements in groundwater in northern Tanzania : Occurrence, distribution, and impacts on drinking water quality
Sammanfattning : The occurrence of arsenic (As), fluoride (F-), and other trace elements (TEs) with potential toxicity in groundwater is a global environmental concern. According to the National water resource mapping database, about 76 % of the drinking water supply in Tanzania is abstracted from groundwater sources. LÄS MER