Environments Parameters of Sediments and the Interface Sediment-Water in the Tacarigua Lagoon (Venezuela)

by Marialsira Gonz?lez-Rivas, Universidad Cent de Venezuela, Caracas, Venezuela,
Pedro Roa Morales, Universidad Cent de Venezuela, Caracas, Venezuela,



Document Type: Proceeding Paper

Part of: Coastal Zone '93

Abstract:

A study was made of the sedimentological characteristics of a lagoon bottom, and of the anions present at the sediment-water interface. For this analysis, the lagoon was divided into five zones that were well differentiated and representative, according to the variability of the characteristics studied. The lagoon sediments are predominantly silt-clay. The clays were kaolinite, mica muscovite and vermiculite. The microgranulometric curves indicate that the sediments were deposited in a tranquil environment. The cumulative macrogranulometric curves in general to a marine transport of sediments. The sediments consists of abundant crystaline quartz, angular and subangular, other minerals present are chlorite, glauconite, limestone, calcite, biotite and sandstone, as well as, chert, evaporites and magnetite. The benthic fauna is characterized by Bittium caraboboense, ostracods, foraminiferans and mollusc shells. Among heavy minerals are found those of both marine and continental origin. The interface was rich in ammonium and sulphate, but phosphate was found in lesser proportion.

Subject Headings: Sediment | Lagoons | Sediment transport | Silt | Minerals | Curvature | Clays | Venezuela | South America

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