Spatial trends in the geochemical composition of sediments in the Panuco River discharge area, Gulf of Mexico. |
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Authors: | L Rosales Hoz A Carranza Edwards S Santiago Perez E Morales De La Garza |
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Institution: | (1) Instituto de Ciencias del Mar y Limnología, UNAM, P.O. Box 70305, Mexico, 04510, DF, Mexico |
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Abstract: | Major and trace elements, organic matter, carbonates, loss of ignition, grain size, gravel, sand, silt, clay, and qualitative
mineralogical composition were determined on surficial marine sediments sampled during the stormy (February), dry (May), and
rainy (September) seasons in the coastal area adjacent to Panuco River discharges into the Gulf of Mexico. The sediments supplied
by the river move in a north-east direction, and are deposited in the north-east extreme of the studied area. Terrigenous
sediments show a strong association of Al2O3 with Fe2O3, Na2O, K2O, P2O5, Rb, Cu, Zn, organic matter, clay, and grain size (Mz). Mineralogical analysis shows that they are formed by quartz, kaolinite,
montmorillonite, illite-montmorillonite and biotite. The highest metal concentration of Cu (25 mg/kg), Zn (155 mg/kg), Pb
(50 mg/kg) and organic matter (1.26%) was observed in the sampling points located very close to the river mouth. A statistical
analysis was done with the information contained in the variables. Five significant factors explain 77% of the total variance:
factor 1 is due to sediments from a terrigenous source, factor 2 corresponds to sediments from a biogenous source, factor
3 is associated to sediments with heavy minerals, factor 4 is due to Co concentration, and factor 5 is due to Ni concentration.
The sediments supplied from the river had a short-term local impact on the sediment distribution, as observed by the carbonate
and heavy mineral concentration of the sediments. |
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Keywords: | Grain size Chemical composition Shelf sediment Trace metals Gulf of Mexico |
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