No.10 - Geochemical Characterization of Holocene Sediments of Santo André Alluvial Plains (SW Portugal)

Sandra C. C. Moreira, Maria C.P. Freitas, Maria F. Araújo, César Andrade, Anabela G. Cruces

Abstract


A paleoenvironmental reconstruction of Santo André lagoon area throughout the Holocene is presented based upon sedimentological and geochemical study of two cores – “Cerradinha 14” and “LSA”, which were taken from the infill of adjacent alluvial plains.
The results of textural analysis (coarse fraction), composition (organic matter) and geochemistry (major, minor and trace elements – Si, Al, Fe, Ca and Cl) allowed the identification of four major lithostratigraphic units, present in both cores, corresponding to a time succession of distinct sedimentary environments – marine, lagoonal and fluvial - in the last 10000 years.


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Keywords


Holocene evolution, paleoenvironmental reconstruction, sedimentary record, geochemistry, coastal lagoonGeochemical Characterization of Holocene Sediments of Santo André Alluvial Plains (SW Portugal)

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