CLAY MINERALOGY OF THE LANDSLIDE IN LEMBO AREA, BANA-BANGOU DISTRICT, WEST PROVINCE OF CAMEROON

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概要

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• The weathering mechanism of pyroclastic rocks distributed at the landslides in Lembo area, Bana-Bangou district, was investigated from a mineralogical viewpoint. Specimens collected from the landslide profile were composed mainly of kaolinite, illite, chlorite, illite-smectite interstratified mineral, gibbsite, goethite, anatase, maghematite, hematite, quartz and feldspar. The landslide area (pyroclastic rock) was characterized by slow creep movement every raining season. The slip zone was recognized on the landslide profile. Chemical composition of the landslide materials showed the complete leaching of CaO and Na_2O, whereas a small amount of K_2O and MgO remained in the whole profile. Detail examinations of the microtexture indicated that the material showed aggregate skeletal matrix with high porosity. This process further caused the decrease of soil strengths and development of micro-texture characteristics that tended to increase the creeping landslide. This displacement rate of the creeping landslide mechanically depended mostly on the pore water pressure in the landslide profile. High pore water pressure always corresponded to the large displacement rate. The mechanism of the creeping landslide was considered from mineralogical characteristics.

著者

• Kitagawa Ryuji

  Hiroshima Univ. Higashi‐hiroshima Jpn

• Kitagawa Ryuji

  Earth And Planetary Systems Sciences Graduate School Of Science Hiroshima University

• DANIEL NJOPWOUO

  Department of Inorganic Chemistry, Faculty of Sciences, University of Yaounde I

• Wouatong Armand

  Department Of Earth Science Faculty Of Science University Of Dschang

• TCHOUA MBAKAM

  Department of Earth Science, Faculty of Science, University of Yaounde 1

• EKODECK GEORGES

  Department of Earth Science, Faculty of Science, University of Yaounde 1

• Tchoua Mbakam

  Department Of Earth Science Faculty Of Science University Of Yaounde 1

• Daniel Njopwouo

  Department Of Inorganic Chemistry Faculty Of Science University Of Yaounde 1

• Ekodeck Georges

  Department Of Earth Science Faculty Of Science University Of Yaounde 1

• Wouatong Armand

  Department Of Earth And Planetary Sciences Faculty Of Science Hiroshima University

• KITAGAWA RYUJI

  Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University

関連論文

• KAOLINIZATION OF SAPROLITE DEVELOPED ON PAN AFRICAN GRANITE OF BATIE DISTRICT, WEST PROVINCE OF CAMEROON
• High Al contents in quartz and hydrothermal alteration of the "Roseki" deposits in the Mitsuishi district, Southwest Japan
• CLAY MINERALOGY OF THE LANDSLIDE IN LEMBO AREA, BANA-BANGOU DISTRICT, WEST PROVINCE OF CAMEROON
• MORPHOLOGICAL TRANSFORMATION OF KAOLIN MINERALS FROM GRANITE SAPROLITE IN THE WESTERN PART OF CAMEROON

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