Person:
Iglesias Martínez, Mario

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First Name
Mario
Last Name
Iglesias Martínez
URI
https://hdl.handle.net/20.500.14352/75290
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Geológicas
Department
Mineralogía y Petrología
Area
Cristalografía y Mineralogía
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End date: 2019 × Start date: 2018 ×

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    Morphological and compositional characterization of gold contained in ferricretes of a weathered profile (Minvoul greenstone belt, Gabon)
    (Macla, 2018) Iglesias Martínez, Mario; Ordóñez Casado, Berta; Berrezueta, Edgar; Pérez Garrido, Carlos
    This study presents the quantification and morphological characterization of particles and nuggets of almost pure gold found in the iron duricrust of a weathering profile of the Archean greenstone belt of Minvoul (Republic of Gabon). The weathered profile on the area (Figure 1) was defined through pits and trenches and consists, from bottom to top, on saprolite, mottled clay zone, iron duricrust, pisolitic gravels and yellow latosol. The iron duricrust constitutes a hard continuous layer, which is concretionary and pisolitic and consists of cemented nodules of goethite, hematite and other iron oxides and hydroxides. Samples from this horizon contain abundant particles of gold. The study of morphology and microchemical composition of gold grains has been widely used as a tool for the understanding of the dissolution, dispersion and gold concentration processes in supergene environments, and for determining the primary or secondary origin of gold grains across the lateritic horizons (Webster and Mann, 1984; Butt and Hough, 2006). Moreover, the results obtained represent a contribution for the knowledge of the gold-potential of the Ntem complex greenstone belts where mineralization on bedrock remains unknown.