Mineralogy and geochemistry of rare earth elements associated with aluminiferous laterite deposits
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The Las Mercedes karstic bauxite deposit, located in the Sierra de Bahoruco, southern region of the Dominican Republic, is situated in the core of a syncline, hosted in limestones corresponding to a planktonic and some benthic foraminiferal wackestone. This deposit is characterized by the presence of hematite, goethite, gibbsite, boehmite, nordstrandite, rutile, and anatase. The Mercedes deposit was characterized as an Fe-rich bauxite with a high degree of laterization. Given their high Cr content, it is likely that the source that gave rise to this deposit was of basic composition. It also has a high LREE content, which shows a clear positive correlation with the major oxides of Al, Fe, and Ti. Due to their rare earth element content, the Mercedes bauxites can be considered a non-conventional source of REE.
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