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Chemical variations in clay minerals of the Archaean Barberton Greenstone Belt (South Africa)

Abstract:

Four rock profiles of shales, carbonates and greywacke-type sediments were sampled from the mafic compositional influenced sedimentary Fig Tree Group and from overlying, more felsic related, sedimentary Moodies Group of the Archaean Barberton Greenstone Belt in South Africa. Clay separates of forty sedimentary rocks were examined by XRD and SEM to study the mineralogical, chemical and morphological variations of the constitutive illite and chlorite. The clay minerals showed a significant K-enrichment in the illites and Mg- and Fe-depletions in the chlorites upwards the stratigraphic sequence. Three independent parameters influenced these variations: (1) a change in the origin of the source rocks; (2) the host-rock lithologies; and (3) a tectono-thermal recrystallization process.

Año de publicación:

1996

Keywords:

    Fuente:

    googlegoogle
    scopusscopus

    Tipo de documento:

    Article

    Estado:

    Acceso restringido

    Áreas de conocimiento:

    • Geoquímica

    Áreas temáticas:

    • Mineralogía
    • Geología económica
    • Ciencias de la Tierra de América del Norte

    Contribuidores:

    Clauer N.Clauer N.
    Theofilos ToulkeridisTheofilos Toulkeridis
    Alfred Kron̈erAlfred Kron̈er