Physico-chemical, Mineralogical And Chemical Considerations In Understanding The 2001 mabeta New Layout Landslide, Cameroon|
Ngole, Veronica M.; Ekosse, Georges-Ivo E. & Ayonghe, Samuel N.
Landslides are part of natural catastrophic disasters destroying both biological and physical
entities including loss of human lives. An evaluation of soil properties involved in landslides is significant in its
management. To this effect, soil samples from the 2001 landslide occurrences in the Mabeta New Layout, Limbe,
Cameroon were analysed using standard techniques to determine texture, pH, electrical conductivity (EC), bulk
density (Db), water absorption percent (WA), linear shrinkage, plasticity index (PI), loss-on-ignition (LOI),
mineral content and major cations. Results obtained were: bulk density (0.89 – 1.08 g/cm3), LOI (19.4 - 25.7%),
water absorption (23.4 – 29.1%), linear shrinkage (5.4 – 8.3%), volume shrinkage (4.8 – 8.5%), PI (13.5 –
20.75%), major cations ((Fe2O3 : 9.91 – 23.24%), (Al2O3 : 9.88 – 28.48%), (CaO : 0.73 – 1.3%), (MgO : 0.55 –
2.80%), (K2O : 1.06 – 1.59%), (Na2O : 0.77 – 0.89%)), pH (5.17 – 6.90) and EC (16.53 – 149.20μS/cm). Values
from physico-chemical analyses, secondary minerals abundance index (SMAI) and chemical index of alteration
(CIA) of the soils were reflective of particles with high potential for sliding. With major contributions from
favourable slope, seismic and hydrologic forces, the event occurred.