Mechanical Behavior of Pillow Lavas in MakoSupergroup: Case of South Mako Hill

Sarr, Déthié; Fall, M; Ngom, Papa Malick; Ndiaye, Mapathé

doi:10.4236/ijg.2011.24065

Cited by 4 publications

(3 citation statements)

References 3 publications

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“…The Mako supergroup comprises associations of volcanic rocks (basalts, basaltic andesite, andesite and rhyodacite) and subvolcanic (microdiorites and microgabbros), in intercalation with sets of volcano-sedimentary rocks (tuffs, cinerites and greywackes) and sedimentary rocks (limestone, sandstone and mudstone). The geology of the KKI has been the subject of several geological and map studies (Barruseau et al, 2009;Sarr et al, 2011). The raw clay from Mako was labelled ArgB and its clay fraction (<2 mm) K-Mako.…”

Section: Origin Of the Clay And Geological Setting Of The Sampling Areamentioning

confidence: 99%

Characterization of natural and chemically modified kaolinite from Mako (Senegal) to remove lead from aqueous solutions

et al. 2014

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The chemical and sorption properties of clay minerals from the Mako area, Senegal, were investigated using FTIR spectroscopy, X-ray diffraction, scanning electron microscopy equipped with an X-ray energy dispersion spectrometer, thermal analysis and chemical analysis. The clay sample is essentially dominated by kaolinite and quartz as also shown by treatment with ethylene glycol and dimethylsulfoxide (DMSO). The clay fraction of this natural clay was organically modified by grafting with 3-aminopropyltriethoxysilane (APTES) in order to improve significantly its retention ability of heavy metals. The silane groups of the APTES reagent were partly grafted on the surface of platy kaolinite particles and the remaining ethoxy groups could be hydrolysed by aqueous treatment. The natural clay, its clay fraction and the organo-functionalized clay (with APTES) were investigated as adsorbents for the removal of Pb(II) from aqueous solutions. Evidence for an organic grafting has been demonstrated by comparing the spectroscopic characteristics of the natural clay and those of its chemically modified derivatives. The effects of different parameters (i.e. initial Pb(II) concentration and contact time) on the adsorption efficiency were studied. For an initial concentration of 10 mg L−1Pb(II), the adsorption was maximized after 30 min contact time both for the raw material and its clay fraction and after 90 min for the APTES grafted clay. Although the maximum of sorption for the APTES grafted clay is reached with slower kinetics, this maximum amount of Pb(II) uptake at room temperature (Xmax) is significantly higher since it is 0.99 mg g−1for the raw clay, 1.46 mg g−1for its clay fraction and 3.02 mg g−1for the organically modified clay, i.e. three times greater than the raw clay.

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Section: Origin Of the Clay And Geological Setting Of The Sampling Areamentioning

confidence: 99%

Characterization of natural and chemically modified kaolinite from Mako (Senegal) to remove lead from aqueous solutions

et al. 2014

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“…This very area has been the subject of previous works focusing on petrographic and geochemical aspects [1]- [5] and participated in knowledge the Kédougou-Kéniéba inlier. Geomechanical works are also done on essentially basaltic rock masses [6] [7] [8]. Even if access is often difficult, it is necessary to understand the behaviour of other rock masses.…”

Section: Introductionmentioning

confidence: 99%

Instabilities Susceptibility Assessment of Fractured Rock Masses Using Geographic Information System: Application on the Sector of Mako (South-Eastern Senegal)

Sarr¹,

Kebe²,

Yasuhara³

et al. 2019

IJG

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The Mako area located in the region of Kedougou is characterized by very hilly terrains with hardly accessible zones. This situation makes it difficult to map these terrains and exposes the populations to the permanent risk of a rock slide. The issue of this paper is to evaluate the instabilities susceptibility at the Mako zone located at the hilliest zone of Senegal. It is done using Geographic Information Systems (GIS). The predisposing factors that are slope, lithology, hydrography, fracturing, land use are defined by the GIS and field data then are confirmed by field observations. According to field observations, more possible scenarios are SC1 and SC4 at the dry season and rainy season respectively. The instabilities susceptibility maps are taken from weighted overlay of these factors and they show that hilly areas are the most susceptible to rockslide or landslide when fractures are present with percent of moderate to high susceptibility between 13% and 22%. These percentages increase and can reach more than 40% with an intense water flow during the rainy season. Hazard can reach up to two hundred meters of foothill according to maps.

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“…The geomechanical analyses conducted on the sites concern basalts. They show by stereography, possibilities of slides [4] [5] confirmed by non zero risk. These instabilities of basaltic massifs, until recently posed the most important threat on the populations.…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of the Hard Hillsides Stability by Empirical Methods and Limit Equilibrium: Case of Ultra Basic and Andesites of Mako and Marbles of Bandafassi (Senegal)

Sarr¹,

Sall²,

Ndiaye³

et al. 2019

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The purpose of this paper is to characterize rock mass stability using basic rock mass method and to compare them. Rock mass quality and strength are determined using rock mass classification and numerical methods. The Factors of safety are calculated with the results of stereographic projection. Results show that quality of ultrabasite and marble are better than quality of andesite. The Slope Mass Ratings (SMR) show that rocks with the best quality are stable and andesite partially stable. The calculation of the factors of Safety by limit equilibrium assigns a stable state for ultrabasite and marble and instable for andesite. Calculation of Safety factor using stereographic parameters in one hand and finite element code in another shows more possibility of planar sliding along discontinuities than rock matrix failure. At last, quality of endogeneous rock mass is correlated with its stability state. The better rock mass is, the more stable the rock it is.

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Mechanical Behavior of Pillow Lavas in MakoSupergroup: Case of South Mako Hill

Cited by 4 publications

References 3 publications

Characterization of natural and chemically modified kaolinite from Mako (Senegal) to remove lead from aqueous solutions

Characterization of natural and chemically modified kaolinite from Mako (Senegal) to remove lead from aqueous solutions

Instabilities Susceptibility Assessment of Fractured Rock Masses Using Geographic Information System: Application on the Sector of Mako (South-Eastern Senegal)

Comparative Analysis of the Hard Hillsides Stability by Empirical Methods and Limit Equilibrium: Case of Ultra Basic and Andesites of Mako and Marbles of Bandafassi (Senegal)

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