The Cabo Norte region, close to the Amazon River mouth is submitted to the
meteorological, oceanographic and Amazonian forcing agents. In this scenario is
located the Sucuriju river, an exoreic drainage which receives the waters from the
Cinturão Lacustre Oriental, due the connection with the Urubu creek and the flooded
plain of Piratuba Lake. The bottom sediment collection was made in both fluvial and
coastal area. The collected material was submitted to grain size and mineralogical
analysis (total mineralogy and clay minerals) through DRX. The results of gran size
showed a mean distribution of 18,60% to sand, 8,62% to clay, and with
predominance of silt, 72,78%, with percentages ranging from 35,77% to 92,73%. The
sediments of the Sucuriju river mouth mineralogical composition is: quartz, albite,
muscovite, k-feldspar, and the Clay minerals ilite, smectite, caolinite e chlorite, being
similar to the assemblage found at the lakes region, suggesting a sedimentary
transport from the lacustrine system to the fluvial-estuarine system. The results
allowed to improve the understanding the actual environmental hydrodynamic and
sedimentation, giving keys to study the sediments origin at the Sucuriju river mouth.
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