Influence of phosphate on mobility and adsorption of REEs during weathering of granites in Thailand
作者： Kenzo Sanematsu , Yoshiaki Kon , Akira Imai
DOI: 10.1016/J.JSEAES.2015.05.018
关键词:
摘要: The Permo-Jurassic North Thai (NT) Granites and the Late Cretaceous to Paleogene Western Province (WP) in Thailand are contrasting terms of tectonic settings chemical compositions. NT Granites, which dominated by S-type features, characterized lower SiO2 contents higher P2O5 than WP this study. In order compare mobility adsorption rare earth elements (REEs) during weathering two granite suites, geochemical analyses were conducted on weathered granites. show wider ranges REEs + Y (REY) contents, percentages ion-exchangeable REY Ce anomalies Granites. These results indicate that REEs less mobile those low can be explained occurrences residual monazite secondary REE phosphates immobilize weathering. Therefore, mostly contained phosphate minerals. contrast, (adsorbed REEs) likely exist surface clays. Previous studies our study suggest granites probably sourced from weatherable allanite, titanite, apatite and/or fluorocarbonate, rarely zircon, resistant potentially high REY, although they influenced degree hydrothermal alteration or
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