
%0 Journal Article
%A Rosales-Hoz, L. 
%A Carranza-Edwards, A. 
%T Geochemistry of deep-sea sediment cores and their relationship with polymetallic nodules from the north-eastern Pacific
%J Marine and Freshwater Research
%D 2001/05/23
%V 52
%N 3
%P 259-266
%K 
%R https://doi.org/10.1071/MF99042
%U https://www.publish.csiro.au/paper/MF99042 
%X Eight sediment cores from the oceanic area close to Clarion Island in the Mexican Economic Exclusive Zone were studied to evaluate their metal content and their relationship to the nodules present in the area. The cores from closer to the East Pacific Rise near 21&ordm;N showed high concentrations of organic matter and Zn, and the lowest concentrations of Fe and Mn. The cores from the Mimar Depression, 166 nmiles south-west of Clarion Island, showed the highest concentration of Fe, Mn, Cu, Ni, and Co in sediments and the highest nodule abundance;this may be related to slower bottom currents. Cores 18 and 20 showed significant correlation of Mn with Cu, Ni, and Co, suggesting that these metals are precipitated with the Mn oxides. Core 25 showed a strong correlation of Fe with Mn, indicating different chemical processes. The MnO: Al2O3 ratio was used to evaluate the different sediment sources, and this allowed differentiation of the areas affected by the hydrothermal discharges. Factor analysis of the compositional data produced four major factors&#8212;diagenetic, hydrothermal, biogenic and detritic&#8212;that together account for 74. 3%of the sample variance. Resumen. Se estudi&oacute; el contenido de metales y su relaci&oacute;n con n&oacute;dulos polimet&aacute;licos presentes en ocho n&uacute;cleos de sedimentos localizados en el &aacute;rea oce&aacute;nica inmediata a la isla Clari&oacute;n en la Zona Econ&oacute;mica Exclusiva de M&#233;xico. Los n&uacute;cleos cercanos a 21&ordm;N de la Dorsal del Pac&#237;fico Oriental muestran altas concentraciones de materia org&aacute;nica y zinc y los valores m&aacute;s bajos de Fe y Mn. Los n&uacute;cleos localizados en la Depresi&oacute;n Mimar, 166 mn al SW de la Isla Clarion, tienen los valores m&aacute;s altos de Fe, Mn, Cu, Ni y Co en sedimentos as&#237; como la mayor abundancia de n&oacute;dulos en el &aacute;rea, esto puede deberse a menor velocidad de las corrientes de fondo. Los nucleos 18 y 20 muestran correlaciones estadisticamente significativas de Mn con Cu, Ni y Co, lo que sugiere que estos metales se precipitan con los &oacute;xidos de Mn. El nucleo 25 muestra una fuerte correlaci&oacute;n entre Fe y Mn lo que sugiere comportamientos qu&#237;micos diferentes en &#233;ste nucleo. A trav&#233;s de la relaci&oacute;n MnO:Al2O3 se infiere el origen de los sedimentos, y se puede reconocer el &aacute;rea afectada por las descargas hidrotermales. El an&aacute;lisis de factores se&ntilde;ala la existencia de cuatro factores: diag&#233;netico-hidrotermal-biog&#233;nico-detritico, los cuales explican 74. 3%de la variancia de la muestra. 
