This study deals with the characterization of a marine sediments profile from the Gulf of Tehuantepec, Mexico. Ten sediment
samples obtained from a core of 18.3 m of length were analysed. Although there have been numerous marine sediments studies
carried out in Mexico, more are needed to better understand the sea floor formation. Crystallographic, morphologic, physical,
chemical and gamma ray activity analysis were carried out on the samples. The analysis results showed a decrease in organic
matter content as a function of sea depth; this value is related to the specific surface area. Some hazardous materials as
Cr, Mn, Ni, Sr and Hg were also identified by PIXE in some samples, probably due to anthropogenic activity. The presence of
uranium a naturally occurring element was found in all the samples, suggesting a migration through all materials of strata,
radioactive elements such as 226Ra, 235U, 212Pb, 214Pb, 228Ac, 208Ti, 214Bi, 228Ac and 40K were detected.