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The aim of the present study is to acquire knowledge about the hardened materials present in the andosolic cover from the Bambouto Mounts. For that purpuse, petrographic, mineralogical, and geochemical characteristics of the hardened materials, isalteritic blocks, and the parent rock were investigated in order to put into relief the different facies found, the genetic relationship between those geological matters, and the mechanism governing the formation and the evolution of the hardened materials found in the Andosols from the Bambouto mounts. These matters have low thickness, are highly hardened, with different aspects and locations. They are present within the soils, at the point of emergence of streams, on the flatty areas on top of hills and at the foot of interfluves. Microscopically, their plasmas are respectively isotic and cristic. Gibbsite, goethite, and halloysite are respectively their main minerals. Geochemically, both facies are highly aluminous. During the weathering, Sanidine changes sequentially into Allophane, Halloysite, and Gibbsite; Pyroxen and Ilmenite for their own contribute to the formation of Goethite. There is a direct genetic relationship between the hardened materials, the isalteritic blocks, and the parent rock. The uphill position is the eluvial part and the downhill position the illuvial part; this generates the evolution of the hardened materials from their translucent initial status towards their reddening and tanning final status. The characteristics of the hardened materials make them bauxitic hardened materials, organized into two different facies: A lithorelictuel and a vitreous facies. The presence of those hardened materials in the Andosols from the Western Highlands of Cameroon is harmful for farming. The present study is then a high contribution to the management of the mine ore deposit within the Western Highlands of Cameroon.
Eno Belinga SM. External dynamic geology of tropical countries of the earth. Iron landscapes. Yaoundé: University Library; 1983.
Tsozue D, Bitom D, Lucas Y. Biogeochemistry of iron, aluminium and silicon in humid tropical mountainous soils (Bambouto Mountain, West Cameroon). The Open Geology Journal. 2009;3:70-81.
Temgoua E, Bitom D, Bilong P, Lucas Y, Pfeifer HR. Démantèlement des paysages cuirassés anciens en zone forestière tropicale d’Afrique Centrale, formation d’accumulations ferrugineuses actuelles au bas des versants. C. R. Géosciences. 2002;334:537-543.
Tematio P, Fritsch E, Hodson ME, Lucas Y, Bitom D, Bilong P. Mineral and geochemical characterization of a leptic-aluandic soil and athapto-aluandic-ferralsol developed on trachytes in Mount Bambouto (Cameroon volcanic line). Geoderma. 2009;152:314-323.
Bitom D. Organization and evolution of a ferralitic cover in humid tropical zone (Cameroon). Genesis and transformation of deep indurated ferruginous complexes. Th. Doct., Univ. Potters. 1988;164.
Momo Nouazi M, Tematio P, Yemefack M. Multiscale organization of the Doumbouo-Fokoue bauxites ore deposits (West Cameroon): Implication to the land-scape lowering. Open J. Geol. 2012;2:14-24.
Momo Nouazi M, Tematio P, Yemefack M. Multiscale organization of the Doumbouo-Fokoue bauxites ore deposits (West Cameroon): Implication to the land-scape lowering. Open J. Geol. 2016;2:14-24.
Fopoussi Tuebue JC. Petrology of the andosols of the Western Highlands of Cameroon and fertilization test: Case of a toposequence developed on trachyte of the upper zone of the southern slope of the Bambouto Mountains. Doctoral Thesis. Department of Earth Sciences, Faculty of Science, University of Ngaoundere. 2018;233.
Fopoussi Tuebue JC, Basga SD, Tematio P, Nguetnkam JP. Effect of trachyte powder, human urine and reserved water from cooked beans on andosols fertility in Cameroonian Western Highlands. Asian Journal of Soil Science and Plants Nutrition. 2018;3(2):1-17.
Morin S. The fundamental dissymmetries of the Highlands of Western Cameroon and their consequences on human occupation. Example of Bambouto Mountains. Man and the tropical mountain. SEPANRIT Ed., Bordeaux. 1988;49- 51.
Valet S. Explanatory notes on climate maps, agro-geological landscapes and proposals for developing the agro-geological landscapes of western Cameroon 1/200 000 CIRAT-IRAT, Montpellier. 1985;120.
Tékoudjou E. Study of rainfall variability on the southern flanks of the Bambouto Mountains. Same. D.E.A. Univ. Ydé I, Fac. Sci. 2004;47.
Tematio P, Kengni L, Bitom D, Hodson M, Fopoussi JC, Leumbe O, Mpakam HG, Tsozue D. Soils and their distribution on Bambouto volcanic mountain, West Cameroon highland, Central Africa. Art., ELSEVIER, J.A.E.S. 2004;447- 457.
Tematio P, Olson KR. Impact of industrialized agriculture on land in Bafou, Cameroon. J. of Soil and Water Conservation. 1997;404-405.
Tematio P, Tsafack EI, Lucas Kengni. Effects of tillage, fallow and burning on selected properties and fertility status of andosols in the Mounts Bambouto, West Cameroon. Agricultural Science. 2011;2(3):334-340.
Ngoufo R. The Bambouto Mountains. Environment and use of space. Thesis Doct. 3rd cycle of geophysics. Univ. Yaoundé. 1988;1,2:374.
Tchoua F. Contribution to the geological and petrographic study of some volcanoes of the Cameroon Line (Mount Manengouba and Mount Bambouto). Thesis Doct. State Sc., Univ. Clermont Ferrant. 1974;347.
Youmen D. Volcanic, petrological and temporal evolution of the Bambouto Mountains Caldera (Cameroon). Thesis Doct., Univ. Kiel. 1994;273.
Tamen J. Contribution to the geological study of the Kapsiki plateau (Extreme-North, Cameroon): Volcanology, petrology and geochemistry. Thesis Doct. 3rd Cycle Sc. Univ. Yaoundé. 1994;132.
Boulangé B. Laterite bauxite formations of Côte d'Ivoire. The facies, their transformations, their distribution and the evolution of the model. Thesis and Mém. ORSTOM. 1984;175:341.
Hiéronymus B. Mineralogical study of bauxite deposits in West Cameroon. Cah Orstom (Sér Pédol). 1973;1:97-110.
Coussot P. Rheology of torrential lava. PhD Thesis of the National Polytechnic Institute of Grenoble. 1992;420.
Trescases JJ. Supergene geochemical evolution of ultra-basic rocks in tropical zone. Formation of the nickel deposits of New Caledonia. ORSTOM, no 78. ISBN: 2-7099-0362-8. 1975;255.
Delvigne J. Pedogenesis in tropical zone. The formation of secondary minerals in ferrallitic media (thesis). Mém. O.R.S.T.O.M., no 13, Dunod, édit. Paris. 1965;177.
Lucas Y, Nahon D, Eyrolle F. Genesis and functioning of soils in an equatorial environment. C.R. Acad. Sci., Paris, Sér. IIA t. 322, Sér. Ila. 1996;1-16.
Fopoussi Tuébué JC. Contribution to the study of soils risen on trachyte on the southern slopes of the Bambouto Mountains (West Cameroon). Thes. Maitrise Fac. Sc., Univ. Dschang. 2001;56.
Tsopjio Jiomeneck SP, Tematio P, Wilson A, Yemefack M. Andosolization of soils on a strombolian cone at Mount Bambouto, Cameroon. Open J. Soil Sci. 2011;1:97-105.
Duchaufour P. Pédologie: 1-pedogeneis and classification. Doc. 2nd Ed. Masson, Paris. 1983;491.
Bitom D, Azinwi Tamfuh P, Mamdem L, Zo’o Zame P, Leumbe Leumbe O, Banakeng L, Keugne R, Désiré Ndjigui P. Influence of altitude on the petrological features of a soil climosequence in the humid tropical zone of Cameroon. The Open Geology Journal. 2013;7:14-30.
Nascimento NR, Bueno GT, Fritsch E, Herbillon AJ, Allard Th, Melfi AJ, Astolfo R, Boucher H, Li Y. Podzolisation as a deferralitisation process. A study of an acrisol-podzol sequence derived from paleozoic sandstone in the northern upper Amazonian basin. European Journal of Soil Science. 2004;55:523-538.
Gassama N. Mechanism of the control of chemical elements in natural solutions. Habilitation to supervise researches. University Francois-Rabelais of Tours. Dept. Eart. Sci. 232p. Soil fertility treshold to diagnose deficiency in calcium, potassium and phosphorus in the sugar tree. Research note No137. 2013;18.
Bocquier G, Muller JP, Boulangé B. Laterites: Present knowledge and perspectives on their differentiation mechanisms. Paris: AFES; 1984.
Tercinier G. Contribution to the knowledge of buaxitisation and allitisation phenomenons. Soils of South-west Pacific atoll karts. Cah. ORSTOM, ser. Pedol. 1971;9(3):307-334.
Edou-Minko A. Petrology and geochemistry of laterites with stoneline of the Ovalaka gold lodging. Application to the prospection in humid equatorial zone. Thesis Doct., Fac. Sci., Geochim. Surface, Univ. Poitier. No d’ordre 194. 1984;183.
Kamprath EJ. Soil acidity and liming. «in» Soils of the humid tropics. Edit. Nat. Acad. of Science Washington. 1972;136-149.
Memento de l’agronome. Republique francaise, Ministere de la Cooperation, reimprression, 4eme edition. Collection «Tecniques Rurales en Afrique». 1993;1635.