KAOLINIZATION OF SAPROLITE DEVELOPED ON PAN AFRICAN GRANITE OF BATIE DISTRICT, WEST PROVINCE OF CAMEROON

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概要

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• The weathering process of the Pan African granitic rock of Batie was mineralogically investigated by means of Microprobe analysis (EPMA), X-ray diffraction (XRD), X-ray fluorescent (XRF), scanning electron microscope (SEM) and transmission electron microscopy (TEM). The porphyritic granite is composed of biotite, feldspar and quartz as main minerals, whereas epidote, chlorite, kaolinite and mica clay mineral are secondary products. Mica clay mineral and kaolinite are main constituent clay minerals in the granite saprolite (weathered granite). Mica clay mineral predominantly occurs at the lower part of the investigated profile associating with a small amount of kaolinite. The granite saprolite at the top part of the profile consists mainly of platy kaolinite with a small amount of lath shape mica clay mineral. Mica clay mineral was formed in the hydrothermal clay veins occurring in the weathering profile. It is inferred that mica clay mineral occurred in the altered granite was formed by hydrothermal activity. Detailed observations of morphological variation by TEM with X-ray analysis revealed that crystal size and shape reasonably explain the transformation sequence of kaolinite as weathering proceeds. Close relationship between crystal size and morphology is obtained. Etch pits developed on quartz and K-feldspar grains are commonly observed. However, shape and size of the etch pits are quite complicated suggesting none monotonous micro-weathering condition. Etch pits found in the upper part are much rougher than those of the lower part. Based on the results obtained, weathering condition of the Batie granite was discussed mainly from the standpoint of clay mineralogy.

• 日本粘土学会の論文

著者

• KITAGAWA RYUJI

  Department of Earth and Planetary System Science, Hiroshima University

• Kitagawa Ryuji

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

• SYLVAIN LUDOVIC

  Department of Earth Sciences, Faculty of Sciences University of Dschang

• MBAKAM TCHOUA

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

• TALLAC VICTOR

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

• DANIEL NJOPWOUO

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

• Sylvain Ludovic

  Department Of Earth Sciences Faculty Of Sciences University Of Dschang

• Mbakam Tchoua

  Department Of Earth Sciences Faculty Of Sciences University Of Yaounde I

• Tallac Victor

  Department Of Earth Sciences Faculty Of Sciences University Of Yaounde I

• Daniel Njopwouo

  Department Of Inorganic Chemistry Faculty Of Sciences University Of Yaounde I

• Daniel Njopwouo

  Department Of Inorganic Chemistry Faculty Of Science University Of Yaounde 1

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
• 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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