MORPHOLOGICAL TRANSFORMATION OF KAOLIN MINERALS FROM GRANITE SAPROLITE IN THE WESTERN PART OF CAMEROON

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概要

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• The weathering process of a granitic rock was mineralogically investigated with XRD, XRF, SEM and TEM at one weathered profile (Ca. 20m in height) in the western part of Cameroon where climate is the intermediate of humid and arid tropical condition. Halloysite and kaolinite are main constituent clay minerals in the granite saprolite (weathered granite). Halloysite predominantly occurs at the lower part of the investigated profile associating with small amount of kaolinite. Numerous spherical-shaped halloysite were observed in the bottom of the profile under TEM. The granite saprolite at the top part of the profile consists mainly of platy kaolinite with small amount of tubular halloysite. Detailed observation of morphological variation by TEM together with X-ray analysis revealed that the spherical-shaped halloysite crystals (0.05-0.5μm) are first unrolled and then transform to tubular halloysite (0.05-2μm), and finally unrolled again producing platy kaolinite (0.2-3μm). Close relationship between crystal size and morphology is obtained.

• 日本粘土学会の論文

著者

• KITAGAWA RYUJI

  Department of Earth and Planetary System Science, Hiroshima University

• Kitagawa R

  Department Of Earth And Planetary Sciences Faculty Of Science Hiroshima University

• Kitagawa Ryuji

  Department Of Earth And Planetary Sciences Graduate School Of Science Hiroshima University

• Wouatong Armand

  Department Of Earth Science Faculty Of Science University Of Dschang

• TAKENO SETSUO

  Department of Earth and Planetary Sciences, Faculty of Science, Hiroshima University

• TCHOUA FELIX

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

• NJOPWOUO DANIEL

  Department of inorganic chemistry, Faculty of Science, University of Yaounde

• Tchoua Felix

  Department Of Earth Sciences Faculty Of Science University Of Yaounde

• Takeno Setsuo

  Department Of Earth And Planetary Sciences Faculty Of Science Hiroshima University

• Njopwouo Daniel

  Department Of Inorganic Chemistry Faculty Of Science University Of Yaounde

• Wouatong Armand

  Department Of Earth And Planetary Sciences Faculty Of Science Hiroshima University

関連論文

• THE OCCURRENCE AND STRUCTURE OF VERMIFORM CHLORITE
• KAOLINIZATION OF SAPROLITE DEVELOPED ON PAN AFRICAN GRANITE OF BATIE DISTRICT, WEST PROVINCE OF CAMEROON
• 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
• The structural study on Fe-pumpellyte : An application of Weissenberg technique combined with a synchrotron radiation and an imaging plate
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• SURFACE MICROTOPOGRAPHIES OF PYROPHYLLITE FROM THE SHOKOZAN AREA, CHUGOKU PROVINCE, SOUTHWEST JAPAN
• ALTERATION MECHANISM OF BIOTITE IN GRANITIC ROCK CAUSED BY CRUSTOSE LICHEN "PORPIDIA"

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