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espanolPaleoclimate research in the Yucatan Peninsula of Mexico has mainly involved fossil pollen preserved in sedimentary archives whilst geochemistry has received limited attention. In this study, we compared concentrations of K, Ti, Fe, Ca and Sr in 35 near-surface late Holocene sediments collected from different permanent and seasonal water bodies across the peninsula with mean annual precipitation of 600-1600 mm in order to explore the relationship between concentrations of inorganic elements and precipitation. The calcareous provenance has a diluting effect and sediments have less K, Ti and Fe (associated with clastics) and more Ca and Sr (associated with carbonate and evaporite) compared to the Upper Continental Crust. Individual elements and ratios of K/Ca, Ti/Ca and Fe/Ca in samples with minimal clastics did not show any relationship with precipitation. Average values of elemental ratios in sediments with more clastics increase as the mean annual precipitation increases. However, the sampling protocol and presence of most of the sampled water bodies being in a single precipitation cluster (i.e. 1200-1400 mm/year) did not allow a complete evaluation of the potential correlation between precipitation and elemental ratios. Considering that the concentration of Ti is low in sediments of the limestone-rich Yucatan Peninsula and Fe is mobile in anoxic depositional environments, the K/Ca ratio can be used as a preliminary proxy to evaluate precipitation in sedimentary records. EnglishLa investigacion paleoclimatica en la Peninsula de Yucatan (YP) de Mexico involucra principalmente el polen fosil preservado en archivos sedimentarios, mientras que la geoquimica ha recibido menos atencion. En este estudio, se compararon las concentraciones de K, Ti, Fe, Ca y Sr, en 35 muestras superficiales de sedimento del Holoceno tardio, colectadas en un gradiente de precipitacion entre 600-1600 mm/a, a lo largo de la YP, con el objetivo de establecer un testigo de la paleo-precipitacion para la region. El origen calcareo tiene un efecto de dilucion en las concentraciones elementales, provocando que los sedimentos presenten baja cantidad de K, Ti y Fe (elementos asociados con clasticos) y mayor cantidad de Ca y Sr (elementos asociados con carbonato y evaporitas), en comparacion con la corteza continental superior. Los elementos individuales y las relaciones de K/Ca, Ti/Ca y Fe/Ca en muestras con cantidades minimas de clastico, no muestran una relacion con la precipitacion. Los valores promedio de la relacion elemental en sedimentos con mas clasticos, muestra tendencias positivas con la precipitacion. No obstante, el protocolo de muestreo y la presencia de un mayor numero de cuerpos de agua investigados en un simple aglomerado (p. ej. 1200-1400 mm/a) no permitio completar la evaluacion de la correlacion potencial entre precipitacion y la relacion elemental. Considerando que la concentracion de Ti en los sedimentos ricos en calizas de la PY es bajo y el Fe es movil en ambientes de depositacion anoxicos, la relacion K/Ca puede ser utilizada como un testigo preliminar para reconstruir la variacion de la paleo-precipitacion.

boletín geológico y minero/boletín geológico y minero

Comparison of elemental concentration in near-surface late Holocene sediments and precipitation regimes of the Yucatán Peninsula (Mexico): a preliminary study.