期刊
GEOLOGICAL QUARTERLY
卷 63, 期 3, 页码 522-538出版社
POLISH GEOLOGICAL INST
DOI: 10.7306/gq.1484
关键词
Tamaulipas; deep-seasediments; enrichment factor; contamination; principle component analysis
类别
资金
- Instituto Nacional de Ecologia y Cambio Climatico (INECC) as part of a long-term project Marco ambiental de las condiciones oceanograficas en el sector NW de la ZEE de Mexico en el Golfo de Mexico (MARZEE)
- CONACyT Ciencia Basica [A1-S-21287]
- Programa de Apoyo a Proyectos de Investigacion e Innovacion Tecnologica [IN106117]
Thirty-five near-surface sediment samples were recovered from the continental shelf and upper slope regions of the northwestern (NW) Gulf of Mexico. The geochemical data of the sediments recovered were examined to investigate the weathering intensity, provenance, palaeo-oxygenation condition, and level of heavy metal contamination. The sediments analysed showed a moderate to high intensity of chemical weathering. Major and trace element concentrations indicated a terrigenous origin, closely related to the weathering of rocks rich in aluminosilicates. The results of this study further revealed that major rivers, the Bravo and Soto La Marina, played an important role in delivering sediments to the study area. The concentration of transition trace elements such as Cr, Cu, Ni, and V revealed that the sediments were derived from inter mediate rocks such as andesite. The V/Cr, Ni/Co, and Cu/Zn ratios in the sediments were <2, <5, and <1, respectively, suggesting a depositional process occurred under well-oxygenated conditions. Principle Component Analysis (PCA) did not show a significant difference in sediment texture between the continental shelf and slope areas. The enrichment factor (EF) and Geo-accumulation index (I-geo) values were <2 and <1, respectively, suggesting the absence of an anthropogenic input.
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