Clay Mineralogy of the Weathered Materials from the Serpentinized Peridotite in Minglanilla, Cebu Province, Philippines
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概要
- 論文の詳細を見る
Serpentinized peridotite is an ultramafic rock that intrudes, during Cretaceous time, as widely scattered diapiric bodies along the principal fault zones of central Cebu, Philippines. This rock is exposed to chemical weathering in tropical conditions and through the leaching reactions leave a friable mantle of in situ regolithic materials. It is envisaged that the serpentine was derived from a pyroxene-rich peridotite. The <2μm clay fraction of four regolithic materials obtained from this rockmass in Camp 7,Minglanilla were examined by means of x-ray diffractometry (XRD), differential thermal analysis (DTA), thermogravimetric analysis (TGA), scanning electron microscopy (SEM) and energy dispersive x-ray (EDX). Results of analyses showcase the polymineralic and heterogeneous nature of the weathered specimens with serpentine predominating, and could be differentiated possibly into two distinct assemblages. The first assemblage consists principally of serpentine-talc-chlorite-smectite and the second assemblage consists of serpentine-chlorite-smectite. Kaolinite is present in trace amounts in both suites. It is strongly perceived that these secondary minerals are genetic products from cadence of chemical alterations of primary ferromagnesian minerals particularly orthopyroxenes and clinopyroxenes. The two assemblages appear to interpret the weathering reaction stages that the hypermelanic peridotite protolith had undergone. The first assemblage possibly corresponds to saprock (friable rock zone) which suggests the earlier stage and lesser intensity of weathering while the second assemblage possibly relates to saprolite (argillized solifluxed zone) which indicates the more advanced and greater intensity of weathering. The transition from the first assemblage to the second assemblage appears telescoping as indicated by the gradating loss of talc in the system. Both assemblages appear highly magnesian, ferruginous, siliceous and non-aluminous.
- 鹿児島大学の論文
- 2002-12-30
著者
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河野 元治
鹿児島大学理学部地球環境科学科
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富田 克利
鹿児島大学理学部地球環境科学科
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ALETA Dennis
Department of Earth and Environmental Sciences, Faculty of Science, Kagoshima University
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TOMITA Katsutoshi
Department of Earth and Environmental Sciences, Faculty of Science, Kagoshima University
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ALETA Josephine
Mines and Geosciences Bureau, Department of Environment and Natural Resources
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KAWANO Motoharu
Department of Environmental Sciences and Technology; Faculty of Agriculture, Kagoshima University
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LUCERO Abraham
Mines and Geosciences Bureau, Department of Environment and Natural Resources
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Lucero A
Mines And Geosciences Bureau Department Of Environment And Natural Resources
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Aleta D
Kagoshima Univ. Kagoshima City Jpn
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Aleta Dennis
Department Of Earth And Environmental Sciences Faculty Of Science Kagoshima University:mines And Geo
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Aleta Dennis
Department Of Earth And Environmental Sciences Faculty Of Science Kagoshima University
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Aleta J
Mines And Geosciences Bureau Department Of Environment And Natural Resources
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Kawano Motoharu
Department Of Biochemical Sciences And Technology Faculty Of Agriculture Kagoshima University
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河野 元治
鹿児島大 理
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Tomita Katsutoshi
Department Of Earth And Environmental Science Graduate School Of Science And Engineering Kagoshima U
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