Concentración y composición mineralógica de la materia en suspensión en las aguas de la Bahía de Cádiz y plataforma continental adyacente
2000
The study of the concentration and mineralogical composition of suspended matter in Cadiz bay
and adjacent continental shelf has been made to determine transport paths and behaviour of
clay minerals. The higher concentrations of suspended matter are found in the outer bay,
specially in the oriental sector. Low concentrations appear in the internal zones of the bay and
inner continental shelf, less affected by tidal currents and with a low continental supply
respectively.
The most abundant clay minerals in suspended sediments are illite followed by smectite, clorite,
kaolinite and randomly mixed-layered illite-smectite. The relations between the clay minerals
were established by Q-mode Factor Analysis. The main clay minerals association obtained in
suspended matter is l>S>CI>l-S>K. The clay minerals distribution indicates high concentration
of illite in the inner and protected part of Cadiz bay, while in the adjacent marine zones
predominates smectite. Those diferences can be explained considering processes such as settling
and diferential transport of clay minerals in marine domain, in relation with hydrodynamics
factors, and the ubication of main sources of sediment supply that control the mineralogical
composition and concentration of suspended matter.
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