Distribution and fractionation of rare earth elements and Yttrium in suspended and bottom sediments of the Kali estuary, western India

摘要: Concentrations of rare earth elements (REE) and yttrium (Y), major metals (Al, Fe Mn) were measured in suspended particulate matter (SPM) bottom sediments the Kali estuary, western India, for their distribution fractionation. The contents SPM it more uniform along longitudinal transect during monsoon. During post- pre-monsoons, low upper/middle estuary coincided with high Mn total REE (∑REE). But lower its ∑REE content increased seaward, while decreased. Y/Ho ratios decreased seaward monsoon but post-monsoon. Sm/Nd marginally other seasons. Post-Archean Average Australian Shale (PAAS)-normalized patterns exhibited middle heavy enrichment positive Ce ($${\text{Ce}}/{\text{Ce}}^{*}$$ ), Eu ($${\text{Eu}}/{\text{Eu}}^{*}$$ ) Y anomalies. $${\text{Ce}}/{\text{Ce}}^{*}$$ $${\text{Eu}}/{\text{Eu}}^{*}$$ seaward. fine-grained showed higher than coarse-grained sediments. PAAS-normalized sediment similar to that SPM. results revealed two processes, colloidal flocculation coagulation low-salinity zone an estuarine turbidity maximum salinity zone. Rare earths (REY) primarily reflected source rock composition chemical weathering. Apart from physico-chemical mineralogy grain size controlled fractionation REY estuary.