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Call for Papers for the semi-thematic N° 67: (Re)defining rural territories, between the global South and North: actors, processes, scales.

Full papers are invited to be submitted via the journal's official platform by 15 March 2024.

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Seasonal study of the sediments in the Queule's estuary, IX region

Authors

  • Carlos Rojas Hoppe Instituto de Geociencias, Universidad Austral de Chile

Abstract

An area between the mouth and 3.5 km upstream was seasonaly sampled, in order to analyze in detail and from a dynamic viewpoint the sedimentary facies spatial distribution and the organic matter content of the present sediments of the Queule River Estuary.

Grain size analyses were determined by the combined sieve and pipette method, and the content of carbon organic matter was determined by ignition. Granulometric parameters of mean size, sorting and skewness were calculated by the method of statistical moments.

Ten textural facies in summer and nine in winter were distinguished in the estuary. In the time between summer and winter samplings, facies were affected by changes in their spatial distribution, in response to the energy level variations in the estuary. The distribution of carbon organic matter in the sediments correlates closely with the distribution of fine - grained material, and there exists a great correlative coefficient between both components. The contents of total
organic matter (21% maximum) seem to be higher than would be expected to occur naturally in an estuary of this type.