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Wyszukujesz frazę "Adewumi, A. J." wg kryterium: Autor


Wyświetlanie 1-2 z 2
Tytuł:
Hydrogeochemical Characterization and Vulnerability Assessment of Shallow Groundwater in Basement Complex Area, Southwest Nigeria
Autorzy:
Adewumi, A. J.
Anifowose, A. Y. B.
Olabode, F. O.
Laniyan, T. A.
Powiązania:
https://bibliotekanauki.pl/articles/100830.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Śląski. Wydział Nauk o Ziemi
Tematy:
DRASTIC
groundwater
hydrogeochemical
Owo
vulnerability
WQI
wody podziemne
zanieczyszczenie
podatność
hydrogeochemia
Opis:
Thirty-five (35) groundwater samples from Owo area were analyzed for physicochemical parameters. Results show that the mean value of pH is 6.32, TDS is 208.92 mg/l, temperature is 28.77oC, EC is 545.16 μs/cm; TH is 111.09 mg/l, SO4 is 71.73 mg/l, Cl is 0.07 mg/l, HCO3 is 14.09 mg/l, Na is 25.06 mg/l, Ca is 37.07 mg/l, K is 24.36 mg/l and Mg is 4.41 mg/l. The results were compared to the WHO and NDSQW standards. All parameters were within the permissible limit except EC in well OW6 and K is above the stipulated standards in 69% of the total samples. The high concentration of K is linked to the use of NPK fertilizer in the area for agricultural purposes. The groundwater belongs to Ca-Na-K-SO4 and Na-Ca-SO4 water type respectively. The ionic concentration in the groundwater is due to the dissolution of the rock that makes up the aquifer. Plagioclase and silicate-bearing rocks are the sources of major ions in the water. SAR, PI, RSBC and KR reveals that groundwater in the area is good for irrigation purpose. DRASTIC model further revealed that groundwater in the area is less vulnerable to contamination under the current environmental conditions.
Źródło:
Contemporary Trends in Geoscience; 2018, 7, 1; 72-103
2299-8179
Pojawia się w:
Contemporary Trends in Geoscience
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Petrogenetic and Compositional Features of Rare Metal PanAfrican Post-Collisional Pegmatites of Southwestern Nigeria; A Status Review
Autorzy:
Oyebamiji, A.
Adewumi, A. J. P.
Zafar, T.
Odebunmi, A.
Falae, P.
Fadamoro, O.
Powiązania:
https://bibliotekanauki.pl/articles/100804.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Śląski. Wydział Nauk o Ziemi
Tematy:
rare metals
petrogenesis
pegmatites
granite
southwestern Nigeria
metale rzadkie
pegmatyt
petrogeneza
granit
Nigeria południowo-zachodnia
Opis:
This research reviews the geology, petrogenesis, compositional trends and geochronology of the rare-metal pegmatite of southwestern Nigeria. The source of these pegmatites is still presently debated which have been explained as either product of highly fractionated molten material or anatexis of the local crust. However, published works of past authors have been compiled to give a detailed understanding of the formation of the mineral deposits. The basement complex of southwestern Nigeria comprises of Precambrian rocks of amphibolite, the hornblende gneiss and the granite gneisses which were formed as a result of the opening and closing of the ensialic basin with significant, extensive subduction during the Pan-African orogeny. The pegmatites in this region have shown internal zoning and a high degree of evolution from the border zone to the core zone during the crystallization and solidification of the felsic granite to pegmatite melt. The rare-metal pegmatites have distinct chemical compositions and mineralogy, containing quartz, biotite, muscovite, microcline, garnet with localized tourmaline, tantalite and columbite. These pegmatites vary significantly by their bulk-rock and mineral chemistry which indicates a more peraluminous attribute and enrichments of lithophile elements of Rb, Cs, Ta and Ba. Previous K/Ar isotopic ages (502.8±13.0 Ma and 514.5±13.2 Ma) suggest that the pegmatites are related to the post-collisional phase of intensive metasomatism. Adopted from previous studies, a five-stage conceptual model of evolution which is widely accepted have been proposed for the origin of the pegmatites.
Źródło:
Contemporary Trends in Geoscience; 2018, 7, 2; 166-187
2299-8179
Pojawia się w:
Contemporary Trends in Geoscience
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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