Open AccessDegrees of pyritization in the Gulf of Mexico in sediments influenced by the Coatzacoalcos and the Grijava-Usumacinta rivers
Author(s) -
Glicinia Valentina Ortiz Zamora,
María del Socorro Santos Díaz,
David Alberto SalasdeLeón,
María Adela MonrealGómez
Publication year - 2002
Publication title -
ciencias marinas
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.215
H-Index - 29
eISSN - 2395-9053
pISSN - 0185-3880
DOI - 10.7773/cm.v28i4.238
Subject(s) - geology , continental shelf , dithionite , oceanography , geochemistry , chemistry , biochemistry , enzyme
Degrees of pyritization (DOP) were measured by three different methods in four cores collected in the Gulf of Mexico, close to the outlet of the Coatzacoalcos and Grijalva-Usumacinta rivers. The extractants used for measuring labile Fe, necessary for the calculation of DOP values, were HCl 1N, dithionite and oxalate, with the first two ones being equivalent for measuring DOP, at least in this type of sediments. The data obtained in this work suggest that in deltaic sediments it is possible to find DOP values higher than those measured in the continental shelf of the Gulf of Mexico, with the sediments closer to the outlets of the Coatzacoalcos and Grijalva-Usumacinta rivers showing values that are even higher than those measured in the Mississippi River delta.