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Se analizaron sedimentos de un nucleo recolectado en la costa del Pacifico de Baja California, ~45km de la costa de la ciudad de Tijuana y a 1257 m de profundidad del agua (32o29.5¢N, 117o28.3 ¢W), para determinar su contenido de metales traza en dos fracciones operacionalmente definidas, HCl y pirita. Los resultados indican una transferencia de Cu > Ni > Zn >> Hg y Ag de la fraccion HCl a la fase piritica. Los grados de piritizacion (DOP) en los sedimentos promediaron 7.2 ± 4.9%, con un valor maximo de 18.5%. Los valores promedio de los grados de piritizacion de metales traza (DTMP) abarcaron el intervalo de 6.2 ± 2.1% a 83 ± 18% para Mn y Hg, respectivamente, aunque los valores maximos para algunos metales estuvieron cercanos al 100%. Esta transferencia aparentemente es funcion de los productos de solubilidad de los sulfuros metalicos y de la abundancia relativa de metales en la fraccion HCl, como sugiere la correlacion significativa (p Ni > Zn >> Hg and Ag from the HCl to the pyrite fraction. Sediments have degrees of pyritization (DOP) that averaged 7.2 ± 4.9%, with a maximum value of 18.5%. Average degrees of trace metal pyritization (DTMP) ranged from 6.2 ± 2.1% to 83 ± 18% for Mn and Hg, respectively, although maximum values for some metals were close to 100%. This transference is apparently a function of the solubility products of metal sulfides and the relative abundances of metals in the HCl fraction, as suggested by the significant correlation (p < 0.001) observed between these two parameters and the DTMP of a number of trace metals. A similar correlation was obtained from published data of two cores collected in the Gulf of Mexico.

Degree of trace metal pyritization in sediments from the Pacific coast of baja california, mexico