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  Subjects -> SCIENCES: COMPREHENSIVE WORKS (Total: 374 journals)
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Malawi Journal of Science and Technology
Number of Followers: 6  

  This is an Open Access Journal Open Access journal
ISSN (Print) 1019-7079
Published by African Journals Online Homepage  [261 journals]
  • Geophysical and geochemical characterization of apatite mineralization on
           Mlindi Ring Structure

    • Authors: Chikondi Chisenga, Hassan Steven Mdala, Annock Gabriel Chiona, Denson Makwela
      Pages: 1 - 31
      Abstract: The geochemical and magnetic data of the Mlindi Ring Structure has been used to understand the full extent of the rare earth and base metal mineralization hosted in the apatite-rich meta-pyroxenite and other mafic to ultra-mafic rocks. Previous studies in Mlindi Ring Structure had only focused on understanding the agro-minerals economic potential from the apatite. However, this study’s combination of geochemical and geophysical analyses of the Mlindi Ring Structure has identified it as a possible multicommodity deposit. The Ring Structure contains considerable anomalous values for gold, zinc, nickel copper and rare earth elements. The mineralization of gold and base metals is found in almost all the lithologies but much higher in apatite-bearing meta-pyroxenite. On the other hand, rare earth elements are mostly associated with dark rocks i.e. meta-gabbro and meta-pyroxenite and less in silica-rich rocks like quartzofeldspathic gneisses. The soil thickness in Mlindi Ring Structure makes it difficult to understand the full mineralization in the rocks underneath it as very few outcrops are present. We combined the geochemical results with the aeromagnetic data analyses to estimate the full extent of the magnetic minerals which make the core of the Ring Structure using its susceptibility and depth estimates. Pyroxenite, meta-gabbro and biotite-rich mafic rocks show some apatite mineralization with a larger percentage in the meta-pyroxenite rather than the other mafic rocks.
      PubDate: 2021-12-10
      Issue No: Vol. 13, No. 2 (2021)
       
  • Mapping Earthquakes in Malawi Using Incorporated Research Institutions for
           Seismology (IRIS) Catalogue for 1972–2021

    • Authors: Polina Lemenkova
      Pages: 32 - 51
      Abstract: Cartographic data visualization is crucial for geological mapping in seismically active areas of Malawi. Representation of the datasets from IRIS database is beneficial for hazard risk assessment, forecasting and damage mitigation, especially for mapping the distribution and magnitude of earthquakes. Scripting cartography using Generic Mapping Tools (GMT) was used to map seismicity in Malawi Rift Zone based on IRIS catalogue for 1972–2021. The maps show relations among the elevation heights, distribution of seismic events and volcanos in the north of the Malawi Lake. The results show correlation between elevations and seismicity with local topographic depressions. Seismic data show variability of the seismicity level with more earthquakes recorded in the north of the country. This paper contributes to the regional studies of Malawi for risk assessment and geological hazard analysis.
      PubDate: 2021-12-10
      Issue No: Vol. 13, No. 2 (2021)
       
  • Impacts of improved traffic control measures on air quality and noise
           level in Benin City, Nigeria

    • Authors: Justina Ebehirieme Ukpebor, Eguono Wayne Omagamre, Bamidele; Abayode, Charles Akhadelor Unuigbe, Edward Nduka Dibie, Emmanuel Ehiabhi Ukpebor
      Pages: 52 - 84
      Abstract: This study has assessed the outcome of implemented traffic control measures within Benin City, Nigeria on the levels of suspended particulate matter (SPM), carbon monoxide (CO) and noise level. A positive effect of the measures was observed with a 49.4% reduction in SPM concentrations, and a decline in the baseline mean from 447.00 µg/m3 (2006) to 226.06 µg/m3 (2018). CO concentrations revealed an 89.7% reduction in the baseline concentration from an average of 19.4 ppm (2010) to 2.0 ppm (2018). This reduction was found to be statistically significant (p<0.05), however the decline in SPM concentration was not significant. Noise pollution has however remained unabated (6.41% reduction) with a baseline mean of 78.18 dB(A) in 2005 and a current average of 73.17 dB(A) (2018). The multivariate analysis conducted using Principal Component Analysis, Multiple Linear Regression and Varimax rotation, identified road traffic as the main noise source in Benin City.
      PubDate: 2021-12-10
      Issue No: Vol. 13, No. 2 (2021)
       
 
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