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The sequential extraction method SEDEX (sedimentary extraction) modificated by ANDERSON & DELANEY(2000) has been used to quantify separately four sedimentary phosphorus reservoirs in sediments of the gulf of Paria and thevenezuelan atlantic coast: adsorbed or labile plus P-associated to oxides (F1), P-authigenic (F2), P-detrital (F3) and P-organic(F4). The marine and continental origin of the sediments was determined by separation of detrital apatite (continental) andcarbonate fluorapatite (CFA) of marine origin. The total phosphorus concentrations are low within the gulf of Paria and theatlantic venezuelan coast in comparison with other coastal areas (2.38 μmol g-1 to 6.84 μmol g-1) and is mainly in detrital form(0.78 to 4.61 μmol g-1). In decreasing order the concentrations are: organic (0.56 a 2.47 μmol g-1), adsorbed or labilephosphorus plus associated oxides (0, 04 to 0. 56 μmol g-1) > autigenic phosphorus (0.04 to 0.31 μmol g-1). ANOVA statisticaltests (P < 0.05) show discrepancies only in the concentrations of the adsorbed or labile phosphorus plus associated oxidesfractions, values being lower in the gulf of Paria. The results suggests that the principal sources are terrestrial lithogenicapatite from eroded material of the orogenic belts of the coastal Andes and Guiana shield and venezuelan and colombian plainswhich was then carried by waters of the Orinoco river and redistributed there. The organic material contribution of nativeorigin and aloctonal is the second factor that controls the presence of phosphorus in the sediment. The marine contributionsare noted towards the northeast end typified by the presence of carbonate fluoroapatite, indicating of transformationprocesses within the sediment

ESPECIACIÓN QUÍMICA DE FÓSFORO EN SEDIMENTOS SUPERFICIALES DEL GOLFO DE PARIA Y EN LA COSTA ATLÁNTICA VENEZOLANA