Iddingsitisation of olivine and kaolinitisation of biotite in two contrasting tephra-derived soils along the Cameroon Volcanic Line (CVL)

DOI PDF 被引用文献1件
  • Roger Kogge Enang
    ASoil Science Department, Faculty of Agronomy and Agricultural Sciences, University of Dschang, PO Box 222, Dschang, Cameroon.
  • Florias Mees
    BDepartment of Geology and Mineralogy, Royal Museum for Central Africa, Tervuren, Belgium.
  • Bernard Palmer Kfuban Yerima
    ASoil Science Department, Faculty of Agronomy and Agricultural Sciences, University of Dschang, PO Box 222, Dschang, Cameroon.
  • Eric Van Ranst
    CDepartment of Geology (WE13), Faculty of Sciences, Ghent University, Ghent, Belgium.

書誌事項

公開日
2020-12-02
権利情報
  • https://doi.org/10.1071/journalslicense
DOI
  • 10.1071/sr20155
公開者
CSIRO Publishing

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説明

<jats:p>Mineral transformations in soils are important processes in assessing pedogenesis. A micromorphological study, complemented by mineralogical and physicochemical analyses, was conducted for two contrasting soils developed on tephra of Mt. Manengouba, i.e. an Andosol and a Cambisol, in order to compare weathering trends based on olivine and biotite alteration. The contrasting character of the two soils is portrayed in their various properties, and is also observed in the field. The majority of the investigated soil properties proved to be effective in capturing differences between the two soils. Iddingsite, formed by pellicular alteration of olivine, occurs in both soils. Its presence is an inherited feature, as recorded by identical occurrences of affected olivine crystals as isolated grains in the groundmass of the soils and as phenocrysts in volcanic rock fragments within the Andosol profile. Kaolinitisation of biotite, producing parallel linear alteration patterns, is limited to the Cambisol and is attributed to pedogenic processes, recording a more advanced stage of weathering than for the Andosol profile. Kaolinitisation is thus more indicative in assessing pedogenesis compared with iddingsitisation in these soils.</jats:p>

収録刊行物

  • Soil Research

    Soil Research 59 (3), 276-286, 2020-12-02

    CSIRO Publishing

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