Mount Bambouto is a polygenic stratovolcano of the Cameroon Volcanic Line,built between 21 Ma and 4.5 Ma(Nkouathio et al.,2008).It is situated at about 200 km NE of mount Cameroon,at 09°55′and 10°15′East a...Mount Bambouto is a polygenic stratovolcano of the Cameroon Volcanic Line,built between 21 Ma and 4.5 Ma(Nkouathio et al.,2008).It is situated at about 200 km NE of mount Cameroon,at 09°55′and 10°15′East and,05°25′and 05°50′North.This volcano covers an area of 500 Km^2 and culminates at 2740 m at Meletan hill and bears a collapsed elliptical caldera at the summit(13×8 km).Mount展开更多
The locality of Lara(Far-North Region,Cameroon)is made up of a pediplain strewn with coalescent plutons.The interaction of internal and external geological processes has contributed to transform the latter into inselb...The locality of Lara(Far-North Region,Cameroon)is made up of a pediplain strewn with coalescent plutons.The interaction of internal and external geological processes has contributed to transform the latter into inselbergs,whose geotouristic values are yet to be studied.Field and laboratory work enabled us to select the geomorphosites through their aesthetic value(particular size and shape)and,geomorphological and geological features.Moreover,it permitted to study and map the geomorphosites using Optic Microscope,Google Earth,GIS software and many other interfaces.Hence,four inselbergs have been selected and studied in the locality of Lara.The petrographic study of these inselbergs shows that granites are the main components of inselbergs and they present a fine to coarse-grained texture,materialized by quartz,micas,plagioclases and alkali feldspars(white and pink in colour).Inselbergs exhibit vertical and parallel networks of diaclases giving them a stratified appearance in some flanks.In addition,on some inselberg limbs and piedmonts,are built tors which contribute to their beauty.The tops of inselbergs,are embellished by several alluring pedestal rocks.On their flanks,shelters of various shapes and sizes(about 12 m length)have developed through the heaps of blocks field.Among the ten shelters selected,some have a fairly high cultural value as they are sacred places for the local population.Moreover,Lara's granitic inselbergs include enclaves(cognate enclaves and xenocrysts)that also significantly improve their geoheritage value.Inselbergs are landforms with high education and aesthetic value that attracted a larger local and foreign population of about 863 visitors between 2017-2019.They constitute an exceptional geoheritage that could attract more tourists in the locality of Lara;but the promotion of geotourism is needed through interpretative panels,marketing of geomorphosites through leaflets,web,media,and geotours,to mention a few.展开更多
The Bamenda Volcano (BV) (2621 m) is a stratovolcano situated in the Cameroon Line (CL). BV includes Mount Lefo (2534 m) which is situated on its southern slopes and contains one elliptical caldera (3 × 4 km). Th...The Bamenda Volcano (BV) (2621 m) is a stratovolcano situated in the Cameroon Line (CL). BV includes Mount Lefo (2534 m) which is situated on its southern slopes and contains one elliptical caldera (3 × 4 km). This caldera is propitious to farming and breeding activity. Despite these profitable assets, Lefo caldera (LC) is an amphitheater of the occurrence of multi-origin hazards that have direct or indirect impacts on the biodiversity and human patrimony. The most present hazards are those of meteorological origin. Numerous combined factors (steepest slopes, heavy rainfalls, weathered state of volcanic products…) rule these hazards. These factors gave rise to the occurrence of landslides, gullies erosion and rock falls which occur precisely on caldera northern and eastern rims. Hazards of anthropogenic origin are based on the destruction of the vegetation cover by the population for dealing, firewood and building issues. Moreover, during the breeding activity, the cattle covers the caldera throughout the day;this unevens the topography and destroys the meadow. Hazards of volcanological origin are not yet occurring in LC;but the recent Lake Monoun (1984) and Nyos (1986) CO2 eruptions, mount Cameroon eruptions (1999 and 2000) and mount Oku Lake event (2011) which are close to the BV and, the age of 0 Myr of basalt, constitutes a subject of controversy toward the reactivation of the Cameroonian hotspot faults. The assessment of risks in LC was based on the average income of breeding activity and house investment. The economy of LC is valued at about US$527472.527. The level of such risk will be important in case of loss of human beings and the destruction of geomorphosites’ values. In order to reduce the level of looses in this zone, hazard and risks maps are provided in this paper as well as some recommendations.展开更多
文摘Mount Bambouto is a polygenic stratovolcano of the Cameroon Volcanic Line,built between 21 Ma and 4.5 Ma(Nkouathio et al.,2008).It is situated at about 200 km NE of mount Cameroon,at 09°55′and 10°15′East and,05°25′and 05°50′North.This volcano covers an area of 500 Km^2 and culminates at 2740 m at Meletan hill and bears a collapsed elliptical caldera at the summit(13×8 km).Mount
文摘The locality of Lara(Far-North Region,Cameroon)is made up of a pediplain strewn with coalescent plutons.The interaction of internal and external geological processes has contributed to transform the latter into inselbergs,whose geotouristic values are yet to be studied.Field and laboratory work enabled us to select the geomorphosites through their aesthetic value(particular size and shape)and,geomorphological and geological features.Moreover,it permitted to study and map the geomorphosites using Optic Microscope,Google Earth,GIS software and many other interfaces.Hence,four inselbergs have been selected and studied in the locality of Lara.The petrographic study of these inselbergs shows that granites are the main components of inselbergs and they present a fine to coarse-grained texture,materialized by quartz,micas,plagioclases and alkali feldspars(white and pink in colour).Inselbergs exhibit vertical and parallel networks of diaclases giving them a stratified appearance in some flanks.In addition,on some inselberg limbs and piedmonts,are built tors which contribute to their beauty.The tops of inselbergs,are embellished by several alluring pedestal rocks.On their flanks,shelters of various shapes and sizes(about 12 m length)have developed through the heaps of blocks field.Among the ten shelters selected,some have a fairly high cultural value as they are sacred places for the local population.Moreover,Lara's granitic inselbergs include enclaves(cognate enclaves and xenocrysts)that also significantly improve their geoheritage value.Inselbergs are landforms with high education and aesthetic value that attracted a larger local and foreign population of about 863 visitors between 2017-2019.They constitute an exceptional geoheritage that could attract more tourists in the locality of Lara;but the promotion of geotourism is needed through interpretative panels,marketing of geomorphosites through leaflets,web,media,and geotours,to mention a few.
文摘The Bamenda Volcano (BV) (2621 m) is a stratovolcano situated in the Cameroon Line (CL). BV includes Mount Lefo (2534 m) which is situated on its southern slopes and contains one elliptical caldera (3 × 4 km). This caldera is propitious to farming and breeding activity. Despite these profitable assets, Lefo caldera (LC) is an amphitheater of the occurrence of multi-origin hazards that have direct or indirect impacts on the biodiversity and human patrimony. The most present hazards are those of meteorological origin. Numerous combined factors (steepest slopes, heavy rainfalls, weathered state of volcanic products…) rule these hazards. These factors gave rise to the occurrence of landslides, gullies erosion and rock falls which occur precisely on caldera northern and eastern rims. Hazards of anthropogenic origin are based on the destruction of the vegetation cover by the population for dealing, firewood and building issues. Moreover, during the breeding activity, the cattle covers the caldera throughout the day;this unevens the topography and destroys the meadow. Hazards of volcanological origin are not yet occurring in LC;but the recent Lake Monoun (1984) and Nyos (1986) CO2 eruptions, mount Cameroon eruptions (1999 and 2000) and mount Oku Lake event (2011) which are close to the BV and, the age of 0 Myr of basalt, constitutes a subject of controversy toward the reactivation of the Cameroonian hotspot faults. The assessment of risks in LC was based on the average income of breeding activity and house investment. The economy of LC is valued at about US$527472.527. The level of such risk will be important in case of loss of human beings and the destruction of geomorphosites’ values. In order to reduce the level of looses in this zone, hazard and risks maps are provided in this paper as well as some recommendations.
