[ Etude morphologique et granulométrique des Stone-Lines de la ville de Butembo (Nord-Kivu / RD Congo) ]
Volume 28, Issue 2, January 2020, Pages 380–389
Kakule Vindusivyolo Florent1
1 Assistant à l’Institut Supérieur Pédagogique d’Oicha, Beni, Nord-Kivu, RD Congo
Original language: French
Copyright © 2020 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
The soil profiles of the City of Butembo show « stone-lines » in the open air and over large areas. The study of these « stone-lines » poses a problem of genesis given the often questionable interpretation of the particle size, mechanical and technical analyzes intended to prove the autochthony and the allochtony of the constituent materials. Allochtony at close range is easily confused with autochtony with local reworking. For a good study of the stone lines of the City of Butembo, we used macroscopic and particle size analyzes to assess the shape and size of the materials. The data collected are represented in the form of plates (figures) and graphs for better analysis. The documentary technique has been restricted to works that fit the research theme. As results, the stone lines of the City of Butembo are based on level II of the altered source rock. These « stone-lines » are heterometric with a predominance of pebbles and pebbles (28%), gravels (23%) and coarse sands (10%). Fine materials account for a total of 31%, synonymous with very intense erosion. Some « stone-lines » are located between the A (black or bluish) and B (yellow or red) horizons. These stone-lines are mixed or holometric, and their thickness is reduced (less than 3m), but also their materials are joined or not. Only one “stone line” is double on steep slopes and all the « stone-lines » have undulations.
Author Keywords: Morphological and granulometric study, Stone-Lines, autochtonie, allochtonie.
Volume 28, Issue 2, January 2020, Pages 380–389
Kakule Vindusivyolo Florent1
1 Assistant à l’Institut Supérieur Pédagogique d’Oicha, Beni, Nord-Kivu, RD Congo
Original language: French
Copyright © 2020 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
The soil profiles of the City of Butembo show « stone-lines » in the open air and over large areas. The study of these « stone-lines » poses a problem of genesis given the often questionable interpretation of the particle size, mechanical and technical analyzes intended to prove the autochthony and the allochtony of the constituent materials. Allochtony at close range is easily confused with autochtony with local reworking. For a good study of the stone lines of the City of Butembo, we used macroscopic and particle size analyzes to assess the shape and size of the materials. The data collected are represented in the form of plates (figures) and graphs for better analysis. The documentary technique has been restricted to works that fit the research theme. As results, the stone lines of the City of Butembo are based on level II of the altered source rock. These « stone-lines » are heterometric with a predominance of pebbles and pebbles (28%), gravels (23%) and coarse sands (10%). Fine materials account for a total of 31%, synonymous with very intense erosion. Some « stone-lines » are located between the A (black or bluish) and B (yellow or red) horizons. These stone-lines are mixed or holometric, and their thickness is reduced (less than 3m), but also their materials are joined or not. Only one “stone line” is double on steep slopes and all the « stone-lines » have undulations.
Author Keywords: Morphological and granulometric study, Stone-Lines, autochtonie, allochtonie.
Abstract: (french)
Les profils pédologiques de la Ville de Butembo font apparaitre des « stone-lines » en plein air et sur des vastes étendus. L’étude de ces « stone-lines » pose un problème de genèse étant donné l’interprétation souvent contestable des analyses granulométriques, mécaniques et techniques destinées à prouver l’autochtonie et l’allochtonie des matériaux constitutifs. L’allochtonie à peu de distance se confond facilement à l’autochtonie avec remaniement sur place. Pour une bonne étude des « stone-lines » de la Ville de Butembo, nous avons recouru à des analyses macroscopiques et granulométriques pour apprécier la forme et la taille des matériaux. Les données recueillies sont représentées sous formes des planches (figures) et des graphiques pour une meilleure analyse. La technique documentaire a été restreinte à des ouvrages cadrant avec le thème de recherche. Comme résultats, les « stone-lines » de la Ville de Butembo reposent sur le niveau II de la roche mère altérée. Ces « stone- lines» sont hétérométriques avec prédominance des galets et cailloux (28 %), graviers (23%) et sables grossiers (10%). Les matériaux fins représentent en tout 31%, synonyme d’une érosion très intense. Certaines stoné- lines sont situées entre les horizons A (de couleur noire ou bleuâtre) et B (de couleur jaune ou rouge). Ces stone-lines sont mixtes ou holométriques, et leur épaisseur est réduite (moins de 3m), mais aussi leurs matériaux sont jointifs ou pas. Une seule « stone-line » est double sur des pentes abruptes et toutes les « stone-lines » présentent des ondulations.
Author Keywords: Etude morphologique et granulométrique, Stone-Lines, autochtonie, allochtonie.
How to Cite this Article
Kakule Vindusivyolo Florent, “Morphological and granulometric study of Stone-Lines of the city of Butembo (Nord-Kivu / DR Congo),” International Journal of Innovation and Applied Studies, vol. 28, no. 2, pp. 380–389, January 2020.
