Abstract
REEs in wetland sediments from the Oaxaca coast in southern Mexico were used to infer the sources and depositional processes by involving both the geochemical characteristics and geostatistical approaches. Statistically strong positive correlation between REEs confirmed similar origin in all the cores. Light REEs (LREEs) represented >84% of ΣREE mean concentrations varies between 47.95 (C1) and 87.84mg/kg (C3). NASC normalized La/Yb, La/Sm, and Gd/Yb ratios indicated more Middle REEs in sediments of C1 and C3 cores and more LREEs in C2 and C4 cores indicating the different mineralogical associations. The absence of Ce anomaly and significant negative Eu anomalies is due to the presence of Fe/Mn oxy-hydroxide, humid subtropical conditions and a strong leaching process. Comparison with REE and possible sources revealed contributions from the Sierra Madre del Sur Mountains with major influences of igneous rocks such as andesite, basaltic andesite, dacite, rhyolitic tuff and rhyolitic vitrophyre.
Published Version
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